 24 Edison's Method in Inventing While the world's progress depends largely upon their ingenuity, inventors are not usually persons who have adopted invention as a distinct profession, but generally speaking, are otherwise engaged in various walks of life. By reason of more or less inherent native genius, they either make improvements along lines of present occupation, or else evolve new methods and means of accomplishing results in fields for which they may have personal predilections. Now and then, however, there arises a man so greatly endowed with natural powers and originality that the creative faculty within him is too strong to endure the humdrum routine of affairs, and manifests itself in a life devoted entirely to the evolution of methods and devices calculated to further the world's welfare. In other words, he becomes an inventor by profession. Such a man is Edison. Notwithstanding the fact that nearly forty years ago, not a great while after he had emerged from the ranks of parapetetic telegraph operators, he was the owner of a large and profitable business as a manufacturer of the telegraphic apparatus invented by him. The call of his nature was too strong to allow of profits being laid away in the bank to accumulate. As he himself has said, he has too sanguine a temperament to allow money to stay in solitary confinement. Hence, all superfluous cash was devoted to experimentation. In the course of years he grew more and more impatient of the shackles that bound him to business routine, and realizing the powers within him, he drew away gradually from purely manufacturing occupations, determining deliberately to devote his life to inventive work and to depend upon its results as a means of subsistence. All persons who make inventions will necessarily be more or less original in character, but to the man who chooses to become an inventor by profession must be conceded a mind more than ordinarily replete with virility and originality. That these qualities in Edison are superabundant is well known to all who have worked with him, and indeed are apparent to everyone from his multiplied achievements within the period of one generation. If one were allowed only two words with which to describe Edison, it is doubtful whether a close examination of the entire dictionary would disclose any others more suitable than experimenter, inventor. These would express the overruling characteristics of his eventful career. It is as an inventor that he sets himself down in the membership list of the American Institute of Electrical Engineers. To attempt the strict placing of these words in relation to each other, except alphabetically, would be equal to an endeavor to solve the old problem as to which came first, the egg or the chicken. For although all his inventions have been evolved through experiment, many of his notable experiments have called forth the exercise of highly inventive faculties in their very inception. Investigation and experiment have been a consuming passion, an impelling force from within, as it were, from his petticoat days when he collected goose eggs and tried to hatch them out by sitting over them himself. One might be inclined to dismiss this trivial incident smilingly as a mere childish thoughtless prank had not subsequent development as a child, boy, and man revealed a born investigator with original reasoning powers that, disdaining crooks and bends, always aimed at the center and, like the flight of a bee, were accurate and direct. It is not surprising, therefore, that a man of this kind should exhibit a ceaseless, absorbing desire for knowledge, and an apparently uncontrollable tendency to experiment on every possible occasion, even though his last scent were spent in thus satisfying the insatiate cravings of an inquiring mind. During Edison's immature years, when he was flitting about from place to place as a telegraph operator, his experimentation was of a desultory, hand-to-mouth character, although it was always notable for originality, as expressed in a number of minor useful devices produced during this period. Small wonder, then, that at the end of these wanderings, when he had found a place to rest the soul of his foot, he established a laboratory in which to carry on his researches in a more methodical and practical manner. In this was the beginning of the work which has since made such a profound impression on contemporary life. There is nothing of the helter-skelter slap-dash style in Edison's experiments. Although all the laboratory experimenters agree in the opinion that he tries everything, it is not merely the mixing of a little of this, some of that, a few drops of the other, in the hope that something will come of it, nor is the spirit of the laboratory work represented in the following dialogue overheard between two alleged carpenters picking up at random to help on a hurry job. How near does she fit, Mike? About an inch. Nail her. A most casual examination of any of the laboratory records will reveal evidence of the minutest exactitude insisted on in the conduct of experiments, irrespective of the length of time they occupied. Edison's instructions, always clear-cut and direct, followed by his keen oversight, admit of nothing less than implicit observance in all details, no matter where they may lead, and impel to the utmost minuteness and accuracy. To some extent there has been a popular notion that many of Edison's successes have been due to mere dumbful luck, to blind fortuitous happenings. Nothing could be further from the truth, for on the contrary it is owing almost entirely to the comprehensive scope of his knowledge, the breadth of his conception, the daring originality of his methods, and minuteness and extent of experiment, combined with unwavering pertinacity, that new arts have been created and additions made to others already in existence. Indeed, without this tireless minutiae and methodical searching spirit, it would have been practically impossible to have produced many of the most important of these inventions. Needless to say, mastery of its literature is regarded by him as a most important preliminary in taking up any line of investigation. What others may have done, bearing directly or collaterally on the subject in print, is carefully considered and sifted to the point of exhaustion. Not that he takes it for granted that the conclusions are correct, for he frequently obtains vastly different results by repeating in his own way experiments made by others as detailed in books. Edison can travel along a well-used road and still find virgin soil, remarked recently one of his most practical experimenters, who had been working along a certain line without attaining the desired result. He wanted to get a particular compound having definite qualities, and had tried in all sorts of ways to produce it but with only partial success. He was confident that it could be done, and said he would try it himself. In doing so he followed the same path in which I had travelled, but by making an undreamed of change in one of the operations succeeded in producing a compound that virtually came up to his specifications. It is not the only time I have known this sort of thing to happen. In speaking of Edison's method of experimenting, another of his laboratory staff says, He has never hindered by theory, but resorts to actual experiment for proof. For instance, when he conceived the idea of pouring a complete concrete house, it was universally held that it would be impossible because the pieces of stone in the mixture would not rise to the level of the pouring point, but would gravitate to a lower plane in the soft cement. This however did not hinder him from making a series of experiments, which resulted in an invention that proved conclusively the contrary. Having conceived some new idea and read everything obtainable relating to the subject in general, Edison's fertility of resource and originality come into play. Taking one of the laboratory notebooks, he will write in it a memorandum of the experiments to be tried, illustrated if necessary by sketches. This book is then passed on to that member of the experimental staff whose special training and experience are best adapted to the work. Here strenuousness is expected, and an immediate commencement of investigation and prompt report are required. Sometimes the subject may be such as to call for a long line of frequent tests which necessitate patient inaccurate attention to minute details. Results must be reported often, daily or possibly with still greater frequency. Edison does not forget what is going on, but in his daily tours through the laboratory keeps in touch with all the work that is under the hands of his various assistants. Being by an instant grasp of the present conditions of any experiment that he has a full consciousness of its meaning and its reference to his original conception. The year 1869 saw the beginning of Edison's career as an acknowledged inventor of commercial devices. From the outset, an innate recognition of system dictated the desirability and wisdom of preserving records of his experiments and inventions. The primitive records, covering the earliest years, were mainly jotted down on loose sheets of paper covered with sketches, notes and data, pasted into large scrapbooks or preserved in packages, but with the passing of years and enlargement of his interests it became the practice to make all original laboratory notes in large uniformed books. This course was pursued until the Menlo Park Period when he instituted a new regime that has been continued down to the present day. A standard form of notebook about eight and a half by six inches containing about two hundred pages was adopted. The number of these books were, and are now, always to be found scattered around in the different sections of the laboratory, and in them have been noted by Edison all his ideas, sketches and memoranda. Details of the various experiments concerning them have been set down by his assistants from time to time. These later laboratory notebooks, of which there are now over one thousand in the series, are eloquent in the history they reveal of the strenuous labors of Edison and his assistants and the vast fields of research he has covered during the last thirty years. They are overwhelmingly rich in biographic material, but analysis would be a prohibitive task for one person, and perhaps interesting only to technical readers. Their pages cover practically every department of science. The countless thousands of separate experiments recorded exhibit the operations of a mastermind seeking to surprise nature into a betrayal of her secrets by asking her the same question in a hundred different ways. For instance, when Edison was investigating a certain problem of importance many years ago, the notebooks show that on this point alone about fifteen thousand experiments and tests were made by one of his assistants. A most casual glance over these notebooks will illustrate the following remark which was made to one of the writers not long ago by a member of the laboratory staff who has been experimenting there for twenty years. Edison can think of more ways of doing a thing than any man I ever saw or heard of. He tries everything and never lets up, even though failure is apparently staring him in the face. He only stops when he simply can't go any further on that particular line. When he decides on any mode of procedure, he gives his notes to the experimenter and lets him alone, only stepping in from time to time to look at the operations and receive reports of progress. The history of the development of the telephone transmitter, phonograph, incandescent lamp, dynamo, electrical distributing systems from central stations, electric railway, ore milling, cement, motion pictures, and a host of minor inventions may be found embedded in the laboratory notebooks. A passing glance at a few pages of these written records will serve to illustrate, though only to a limited extent, the thoroughness of Edison's method. It is to be observed that these references can be but of the most meager kind and must be regarded as merely throwing a sidelight on the subject itself. For instance, the complex problem of a practical telephone transmitter gave rise to a series of most exhaustive experiments. Combinations in almost infinite variety including gums, chemical compounds, oils, minerals, and metals were suggested by Edison, and his assistants were given long lists of materials to try with reference to predetermined standards of articulation, degrees of loudness, and perfection of hissing sounds. The notebooks contained hundreds of pages showing that a great many thousands of experiments were tried and passed upon. Such remarks as NG, pretty good, whistling good, but no articulation, rattly, articulation, whispering, and whistling good, best tonight so far, and others are noted opposite the various combinations as they were tried. Thus one may follow the investigation through a maze of experiments which led up to the successful invention of the carbon button transmitter, the vital device to give the telephone its needed articulation and perfection. The two hundred and odd notebooks covering the strenuous period during which Edison was carrying on his electric light experiments tell on their forty thousand pages or more a fascinating story of the evolution of a new art in its entirety. From the crude beginnings through all the varied phases of this evolution the operations of a mastermind are apparent from the contents of these pages in which are recorded the innumerable experiments, calculations, and tests that ultimately brought light out of the darkness. The early work on a metallic conductor for lamps gave rise to some very thorough research on melting and alloying metals, the preparation of metallic oxides, the coating of fine wires by immersing them in a great variety of chemical solutions. Following his usual custom Edison would indicate the lines of experiment to be followed which were carried out and recorded in the notebooks. He himself in January 1879 made personally a most minute and searching investigation into the properties and behavior of plating iridium, boron, rutile, zircon, chromium, molybdenum, and nickel under varying degrees of current strength on which there may be found in the notes about forty pages of detailed experiments and deductions in his own handwriting concluding with the remark about nickel, this is a great discovery for electric light in the way of economy. The period of research on nickel, etc., was evidently a trying one, for after nearly a month's close application, he writes, on January 27th, 1879, owing to the enormous power of the light my eyes commenced to pain after seven hours work and I had to quit. On the next day appears the following entry, suffered the pains of hell with my eyes last night from ten p.m. till four a.m., when got to sleep with a big dose of morphine. Eyes getting better and do not pain much at four p.m., but I lose today. The try everything spirit of Edison's method is well illustrated in this early period by a series of about sixteen hundred resistance tests of various ores, minerals, earths, etc., occupying over fifty pages of one of the notebooks relating to the metallic filament for his lamps. But as the reader has already learned, the metallic filament was soon laid aside in favor of carbon, and we find in the laboratory notes an amazing record of research and experiment conducted in the minute and searching manner peculiar to Edison's method. His inquiries were directed along all the various roads leading to the desired goal, for long before he had completed the invention of a practical lamp, he realized broadly the fundamental requirements of the successful system of electrical distribution, and had given instructions for the making of a great variety of calculations which, although far in advance of the time, were clearly foreseen by him to be vitally important in the ultimate solution of the complicated problem. Thus we find many hundreds of pages of the notebooks covered with computations and calculations by Mr. Upton, not only on the numerous ramifications of the projected system and comparisons with gas, but also on proposed forms of dynamos and the proposed station in New York. A mere recital by titles of the vasting number of experiments and tests on carbons, lamps, dynamos, armatures, commutators, windings, systems, regulators, sockets, vacuum pumps, and the 1001 details relating to the subject in general, originated by Edison and methodically and systematically carried on under his general direction, would fill a great many pages here, and even then would serve only to convey a confused impression of ceaseless probing. It is possible only to a broad, comprehensive mind well stored with knowledge and backed with resistless, boundless energy that such a diversified series of experiments and investigations could be carried on simultaneously and assimilated, even though they should relate to a class of phenomena already understood and well defined. But if we pause to consider that the commercial subdivision of the electric current, which was virtually an invention made to order, involved the solution of problems so unprecedented that even they themselves had to be created, we cannot but conclude that the aphelitus of innate genius played an important part in the unique methods of investigation instituted by Edison at that and other times. The idea of attributing great successes to genius has always been repudiated by Edison, as evidenced by his historic remark that genius is one percent inspiration and ninety-nine percent perspiration. Again, in a conversation many years ago at the laboratory between Edison Bachelor and E. H. Johnson, the latter made allusion to Edison's genius as evidenced by some of his achievements when Edison replied, I tell you geniuses hard work, stick-to-itiveness, and common sense. Yes, said Johnson, I admit there is all that to it, but there's still more. Batch and I have those qualifications, but although we know quite a lot about telephones and worked hard, we couldn't invent a brand-new, non-infringing telephone receiver as you did when Garot cabled for one. Then how about the subdivision of the electric light? Electric current, corrected Edison. True, continued Johnson, you were the one to make that very distinction. The scientific world had been working hard on subdivision for years, using what appeared to be common sense, results worse than nil. Then you come along, and about the first thing you do after looking the ground over is to start off in the opposite direction, which subsequently proves to be the only possible way to reach the goal. It seems to me that this is pretty close to the dictionary definition of genius. It is said that Edison replied rather incoherently and changed the topic of conversation. This innate modesty, however, does not prevent Edison from recognizing and classifying his own methods of investigation. In a conversation with two old associates recently, April 1909, he remarked, It has been said of me that my methods are empirical. That is true only so far as chemistry is concerned. Did you ever realize that practically all industrial chemistry is colloidal in nature? Hard rubber, celluloid, glass, soap, paper, and lots of others all have to deal with amorphous substances, as to which comparatively little has been really settled. My methods are similar to those followed by Luther Burbank. He plants an acre, and when this is in bloom, he inspects it. He has a sharp eye, and he can pick out of thousands a single plant that has promise of what he wants. From this, he gets the seed and uses his skill and knowledge in producing from it a number of new plants, which, on development, furnish the means of propagating an improved variety in large quantity. So when I am after a chemical result that I have in mind, I may make hundreds or thousands of experiments out of which there may be one that promises results in the right direction. This I follow up to its legitimate conclusion, discarding the others, and usually get when I am after. There is no doubt about this being empirical, but when it comes to problems of a mechanical nature, I want to tell you that all I have ever tackled and solved have been done by hard, logical thinking. The intense earnestness and emphasis with which this was said were very impressive to the auditors. This empirical method may perhaps be better illustrated by a specific example. During the latter part of the storage battery investigations, after the form of positive element had been determined upon, it became necessary to ascertain what definite proportions and what quality of nickel hydrate and nickel flake would give the best results. A series of positive tubes were filled with the two materials in different proportions, say, nine parts hydrate to one of flake, eight parts hydrate to two of flake, seven parts hydrate to three of flake, and so on through varying proportions. Three sets of each of these positives were made, and all put into separate test tubes with a uniform type of negative element. These were carried through a long series of charges and discharges under strict test conditions. From the tabulated results of hundreds of tests, there were selected three that showed the best results. These, however, showed only the superiority of certain proportions of the materials. The next step would be to find out the best quality. Now, as there are several hundred variations in the quality of nickel flake and perhaps a thousand ways to make the hydrate, it will be realized that Edison's methods led to stupendous detail, for these tests embraced a trial of all the qualities of both materials in the three proportions found to be the most suitable. Among these many thousands of experiments, any that showed extraordinary results were again elaborated by still further series of tests, until Edison was satisfied that he had obtained the best result in that particular line. The laboratory notebooks do not always tell the whole story or meaning of an experiment that may be briefly outlined on one of their pages. For example, the early filament made of a mixture of lamp black and tar is merely a suggestion in the notes, but it's making afforded an example of Edison's pertinacity. These materials, when mixed, became a friable mass, which he had found could be brought into such a cohesive, putty-like state by manipulation as to be capable of being rolled out into filaments as fine as seven thousandths of an inch in cross-section. One of the laboratory assistants was told to make some of this mixture, knead it, and roll some filaments. After a time he brought the mass to Edison and said, There's something wrong about this, for it crumbles even after manipulating it with my fingers. How long did you need it, said Edison? Oh, more than an hour, replied the assistant. Well, just keep on for a few hours more, and it will come out all right, was the rejoinder. And this proved to be correct, for after a prolonged kneading and rolling, the mass changed into a cohesive, stringy, homogeneous putty. It was from a mixture of this kind that spiral filaments were made, and used in some of the earliest forms of successful incandescent lamps. Indeed, they are described and illustrated in Edison's fundamental lamp patent, number 220,898. The present narrative would assume the proportions of a history of the incandescent lamp, should the authors attempt to follow Edison's investigations through the thousands of pages of notebooks away back in the 80s and early 90s. Improvement of the lamp was constantly in his mind all those years, and besides the vast amount of detail, experimental work he laid out for his assistants. He carried on a great deal of research personally. Sometimes whole books are filled in his own handwriting with records of experiments showing every conceivable variation of some particular line of inquiry, each trial bearing some terse comet expressive of results. In one book appear the details of one of these experiments on September 3rd, 1891, at 4.30 a.m., with the comment, brought up lamp higher than a 16 CP240 was ever brought before. Hurrah! Notwithstanding the late hour, he turns over to the next page and goes on to write his deductions from this result, as compared with those previously obtained. Proceeding day by day, as appears by this same book, he follows up another line of investigation on lamps, apparently full of difficulty, for after 132 other recorded experiments, we find this note. Saturday, 3.30, went home disgusted with incandescent lamps. This feeling was evidently evanescent for on the next succeeding Monday, the work was continued and carried on by him as keenly as before, as shown by the next batch of notes. This is the only instance showing any indication of impatience that the authors have found in looking through the enormous mass of laboratory notes. All his assistants agree that Edison is the most patient, tireless experimenter that could be conceived of. Failures did not distress him. Indeed, he regards them as always useful, as may be gathered from the following, related by Dr. E. G. Atchison, formerly one of his staff. I once made an experiment in Edison's laboratory at Menlo Park during the latter part of 1880, and the results were not as looked for. I considered the experiment a perfect failure, and while bemoaning the results of this apparent failure, Mr. Edison entered, and after learning the facts of the case cheerfully remarked that I should not look upon it as a failure, for he considered every experiment a success. As in all cases, it cleared up the atmosphere, and even though it failed to accomplish the results sought for, it should prove a valuable lesson for guidance in future work. I believe that Mr. Edison's success as an experimenter was, to a large extent, due to this happy view of all experiments. Edison is frequently remarked that out of 100 experiments, he does not expect more than one to be successful, and as to that one, he is always suspicious until frequent repetition has verified the original results. This patient, optimistic view of the outcome of experiments has remained part of his character down to this day, just as his painstaking, minute, incisive methods are still unchanged. But to the careless, stupid, or lazy person, he is a terror for the short time they remain around him. Honest mistakes may be tolerated, but not carelessness and competence or lack of attention to business. In such cases, Edison is apt to express himself freely and forcibly, as when he was asked why he had parted with a certain man, he said, oh, he was so slow that it would take him half an hour to get out of the field of a microscope. Another instance will be illustrative. Even after the Brockton, Massachusetts Central Station was started in operation many years ago, he wrote a note to Mr. W. S. Andrews, containing suggestions as to future stations, part of which related to the various employees and their duties. After outlining the duties of the meterman, Edison says, I should not take too young a man for this, say, a man from 23 to 30 years old, bright and business-like, don't want anyone who yearns to enter a laboratory and experiment. We have a bad case of that at Brockton. He neglects business to potter. What we want is a good lamp average and no unprofitable customer. You should have these men on probation and subject to passing an examination by me. This will wake them up." Edison's examinations are no joke, according to Mr. J. H. Vail, formerly one of the Menlo Park staff. I wanted a job, he said, and was ambitious to take charge of the dynamo room. Mr. Edison led me to a heap of junk in a corner and said, put that together and let me know when it's running. I didn't know what it was, but received a liberal education in finding out. It proved to be a dynamo, which I finally succeeded in assembling and running. I got the job. Another man who succeeded in winning a place as an assistant was Mr. John F. Ott, who has remained in his employ for over forty years. In 1869, when Edison was occupying his first manufacturing shop, the third floor of a small building in Newark, he wanted a first-class mecanition, and Mr. Ott was sent to him. He was then an ordinary-looking young fellow, says Mr. Ott, dirty as any of the other workmen, unkempt and not much better dressed than a tramp, but I immediately felt that there was a great deal in him. This is the conversation that ensued. Led by Mr. Edison's question, What do you want? Work. Can you make this machine work? Exhibiting it and explaining its details. Yes. Are you sure? Well, you needn't pay me if I don't. And thus Mr. Ott went to work and succeeded in accomplishing the results desired. Two weeks afterward Mr. Edison put him in charge of the shop. Edison's life fairly teems with instances of unruffled patience in the pursuit of experiments. When he feels thoroughly impressed with the possibility of accomplishing a certain thing, he will settle down composably to investigate it to the end. This is well illustrated in a story relating to his invention of the type of storage battery bearing his name. Mr. W. S. Mallory, one of his closest associates for many years, is the authority for the following. When Mr. Edison decided to shut down the ore-milling plant at Edison, New Jersey, in which I had been associated with him, it became a problem as to what he could profitably take up next, and we had several discussions about it. He finally thought that a good storage battery was a great requisite, and decided to try and devise a new type, for he declared emphatically he would make no battery requiring sulfuric acid. After a little thought he conceived the nickel-iron idea, and started to work at once with characteristic energy. About 7 or 7.30 a.m. he would go down to the laboratory and experiment, only stopping for a short time at noon to eat a lunch sent down from the house. About 6 o'clock the carriage would call to take him to dinner, from which he would return by 7.30 or 8 o'clock to resume work. The carriage came again at midnight to take him home, but frequently had to wait until 2 or 3 o'clock, and sometimes return without him, as he had decided to continue all night. This had been going on more than five months, seven days a week, when I was called down to the laboratory to see him. I found him at a bench about 3 feet wide and 12 to 15 feet long, on which there were hundreds of little test cells that had been made up by his core of chemists and experimenters. He was seated at this bench, testing, figuring, and planning. I then learned that he had thus made over 9,000 experiments in trying to devise this new type of storage battery, but had not produced a single thing that promised to solve the question. In view of this immense amount of thought and labor, my sympathy got the better of my judgment, and I said, Isn't it a shame that with the tremendous amount of work you have done, you haven't been able to get any results? Edison turned on me like a flash, and with a smile replied, Results? Why, man, I have gotten a lot of results. I know several thousand things that won't work. At that time he sent me out west on a special mission. On my return a few weeks later, his experiments had run up to over 10,000, but he had discovered the missing link in the combination sought for. Of course we all remember how the battery was completed and put on the market. Then, because he was dissatisfied with it, he stopped the sales and commenced a new line of investigation, which has recently culminated successfully. I shouldn't wonder if his experiments on the battery ran up pretty near to 50,000, for they filled more than 150 of the notebooks to say nothing of some thousands of tests and curve sheets. Although Edison has an absolute disregard for the total outlay of money in investigation, he is particular to keep down the cost of individual experiments to a minimum, for as he observed to one of his assistants. A good many inventors try to develop things life-size and thus spend all their money instead of first experimenting more freely on a small scale. To Edison, life is not only a grand opportunity to find out things by experiment, but, when found, to improve them by further experiment. One night, after receiving a satisfactory report of progress from Mr. Mason, superintendent of the cement plant, he said, the only way to keep ahead of the procession is to experiment. If you don't, the other fellow will. When there's no experimenting, there's no progress. Stop experimenting, and you go backward. If anything goes wrong, experiment until you get to the very bottom of the trouble. It is easy to realize, therefore, that a character so thoroughly permeated with these ideas is not apt to stop and figure out expense when in hot pursuit of some desired object. When that object has been attained, however, and it passes from the experiment as a commercial stage, Edison's monetary views again come into strong play, but they take a diametrically opposite position, for then he begins immediately to plan the extreme of economy in the production of the article. A thousand and one instances could be quoted in illustration, but as they would tend to change the form of this narrative into a history of economy and manufacture, it will spice to mention but one, and that a recent occurrence, which serves to illustrate how closely he keeps in touch with everything, and also how the inventive faculty and instinct of commercial economy run close together. It was during Edison's winter stay in Florida in March 1909. He had reports sent to him daily from various places and studied them carefully, for he would write frequently with comments, instructions and suggestions, and in one case, commenting on the oiling system at the cement plant, he wrote, your oil losses are now getting lower, I see. Then after suggesting some changes to reduce them still further, he went on to say, here is a chance to save a mill per barrel based on your regular daily output. This thorough consideration of the smallest detail is essentially characteristic of Edison, not only in economy of manufacture, but in all his work, no matter of what kind, whether it be experimenting, investigating, testing or engineering. To follow him through the labyrinthine passages of investigation contained in the great array of laboratory notebooks is to become involved in a mass of minutely detailed researches, which seek to penetrate the inmost recesses of nature by an ultimate analysis of an infinite variety of parts. As the reader will obtain a fuller comprehension of this idea under Edison's methods by concrete illustration rather than by generalization, the authors have thought it well to select at random two typical instances of specific investigations out of the thousands that are scattered through the notebooks. These will be found in the following extracts from one of the notebooks and consist of Edison's instructions to be carried out in detail by his experimenters. Take say 25 pounds hard Cuban asphalt and separate all the different hydrocarbons, et cetera, as far as possible by means of solvents. It will be necessary first to dissolve everything out by say hot turpentine, then successfully treat the residue with bisulfide, carbon, benzole, ether, chloroform, naphtha, toluol, alcohol, and other probable solvents. After you can go no further to still off all the solvents so the asphalt material has a tarlight consistency. Be sure all the ash is out of the turpentine portion. Now after distilling the turpentine off, act on the residue with all the solvents that were used on the residue. Using for the first the solvent which is least likely to dissolve a great part of it. By thus manipulating the various solvents you will be enabled probably to separate the crude asphalt into several distinct hydrocarbons. Put each in a bottle after it has been dried and label the bottle with the process, et cetera, so we may be able to duplicate it. Also give bottle a number and describe everything fully in notebook. Destructively distill the following substances down to a point just short of carbonization so that the residue can be taken out of the retort powdered and acted on by all the solvents just as the asphalt in previous page. The distillation should be carried to say 600 degrees or 700 degrees Fahrenheit but not continued long enough to wholly reduce mass to charcoal but always run to blackness. Separate the residue in as many different parts as possible, bottle and label and keep accurate records as to process, weights, et cetera. So a reproduction of the experiment can at any time be made. Gelatin, four pounds, asphalt, hard Cuban, 10 pounds, coal tar or pitch, 10 pounds, wood pitch, 10 pounds, Syrian asphalt, 10 pounds, bituminous coal, 10 pounds, cane sugar, 10 pounds, glucose, 10 pounds, dextrin, 10 pounds, glycerin, 10 pounds, tartaric acid, five pounds, gum guillac, five pounds, gum amber, three pounds, gum tragacanth, three pounds, aniline red, one pound, aniline oil, one pound, crude anthracine, five pounds, petroleum pitch, 10 pounds, albumin from eggs, two pounds, tar from passing chlorine through aniline oil, two pounds, citric acid, five pounds, sawdust of boxwood, three pounds, starch, five pounds, shellac, three pounds, gum arabic, five pounds, castor oil, five pounds. The empirical nature of his method will be apparent from an examination of the above items, but in pursuing it he leaves all uncertainty behind and trusting nothing to theory he acquires absolute knowledge. Whatever may be the mental processes by which he arrives at the starting point of any specific line of research, the final results almost invariably prove that he does not plunge in at random, indeed, as an old associate remarked, when Edison takes up any proposition in natural science, his perceptions seem to be elementally broad and analytical, that is to say, in addition to the knowledge he has acquired from books and observation, he appears to have an intuitive apprehension of the general order of things as they might be supposed to exist in natural relation to each other. It has always seemed to me that he goes to the core of things at once. Although nothing less than results from actual experiments are acceptable to him as established facts, this view of Edison may also account for his peculiar and somewhat weird ability to guess correctly, a faculty which has frequently enabled him to take shortcuts to lines of investigation whose outcome has verified, in a most remarkable degree, statements apparently made off hand and without calculation. Mr. Upton says, This was supplemented by one of his engineering staff who remarked, Mr. Edison can guess better than a good many men can figure, and so far as my experience goes, I have found that he is almost invariably correct. His guess is more than a mere starting point and often turns out to be this final solution of a problem. I can only account for it by his remarkable insight and wonderful natural sense of the proportion of things, in addition to which he seems to carry in his head determining factors of all kinds and has the ability to apply them instantly in considering any mechanical problem. While this mysterious intuitive power has been of the greatest advantage in connection with the vast number of technical problems that have entered into his life work, there have been many remarkable instances in which it has seemed little less than prophecy and it has deemed worthwhile to digress to the extent of relating two of them. One day in the summer of 1881, when the incandescent lamp industry was still in swaddling clothes, Edison was seated in the room of Major Eaton, Vice President of the Edison Electric Light Company, talking over business matters when Mr. Upton came in from the lamp factory at Menlo Park and said, while Mr. Edison, we completed a thousand lamps today. Edison looked up and said, good, then relapsed into a thoughtful mood. In about two minutes, he raised his head and said, Upton, in 15 years, you will be making 40,000 lamps a day. None of those present ventured to make any remark on this assertion, although all felt that it was merely a random guess based on the sanguine dream of an inventor. The business had not then really made a start and being entirely new was without precedent upon which to base any such statement. But as a matter of fact, the records of the lamp factory show that in 1896, its daily output of lamps was actually about 40,000. The other instance referred to occurred shortly after the Edison machine works was moved up to Schenectady in 1886. One day when he was at the works, Edison sat down and wrote on a sheet of paper 15 separate predictions of the growth and future of the electrical business, notwithstanding the fact that the industry was then in an immature state and that the great boom did not set in until a few years afterward. 12 of these predictions have been fully verified by the enormous growth and development in all branches of the art. What the explanation of this gift, power, or intuition may be is perhaps better left to the psychologist to speculate on. If one were to ask Edison, he would probably say, hard work, not too much sleep and free use of the imagination. Whether or not it would be possible for the average mortal to arrive at such perfection of guessing by faithfully following this formula, even reinforced by the Edison recipe for stimulating a slow imagination with pastry, is open for demonstration. Somewhat allied to this curious faculty is another no less remarkable and that is the ability to point out instantly an error in a massive reported experimental results. While many instances could be definitely named, a typical one related by Mr. J. D. Flack, formerly master mechanic at the lamp factory, may be quoted. During the many years of lamp experimentation, batches of lamps were sent to the photometer department for test and Edison would examine the tabulated test sheets. He ran over every item of the tabulations rapidly and apparently without any calculation, whatever would check off errors as fast as he came to them saying, you have made a mistake, try this one over. In every case, the second test proved that he was right. This wonderful aptitude for infallibly locating an error without an instant hesitation for mental calculation has always appealed to me very forcibly. The ability to detect errors quickly in a series of experiments is one of the things that has enabled Edison to accomplish such a vast amount of work as the records show. Examples of the minuteness of detail and to which his research has extend have already been mentioned and as there are always a number of such investigations in progress at the laboratory, this ability stands Edison in good stead for he is thus unable to follow and if necessary correct each one step by step. In this he is aided by the great powers of a mind that is able to free itself from absorbed concentration on the details of one problem and instantly to shift over and become deeply and intelligently concentrated in another and entirely different one. For instance, he may have been busy for hours on chemical experiments and be called upon suddenly to determine some mechanical questions. The complete and easy transition is the constant wonder of his associates for there is no confusion of ideas resulting from these quick changes, no hesitation or apparent effort, but a plunge into the midst of the new subject and an instant acquaintance with all its details as if he had been studying it for hours. A good stiff difficulty, one which may perhaps appear to be an unsurmountable obstacle only serves to make Edison cheerful and brings out variations of his methods in experimenting. Such an occurrence will start him thinking which soon gives rise to a line of suggestions for approaching the trouble from various sides or he will sit down and write out a series of eliminations, additions or changes to be worked out and reported upon with such variations as may suggest themselves during their progress. It is at such times as these that his unfailing patience and tremendous resourcefulness are in evidence. Ideas and expedience are poured forth in a torrent and although some of them have temporarily appeared to the staff to be ridiculous or irrelevant, they have frequently turned out to be the ones leading to the correct solution of the trouble. Edison's inexhaustible resourcefulness and fertility of ideas have contributed largely to his great success and have ever been a cause of amusement to those around him. Frequently when it would seem to others that the extreme end of an apparently blind alley had been reached and that it was impossible to proceed further, he has shown that there were several ways out of it. Examples without number could be quoted but one must suffice by way of illustration. During the progress of the or milling work at Edison it became desirable to carry on a certain operation by some special machinery. He requested the proper person on his engineering staff to think this matter up and submit a few sketches of what he would propose to do. He brought three drawings to Edison who examined them and said none of them would answer. The engineer remarked that it was too bad for there was no other way to do it. Mr. Edison turned to him quickly and said, do you mean to say that those drawings represent the only way to do this work? To which he received the reply, I certainly do. Edison said nothing. This happened on a Saturday. He followed his usual custom of spending Sunday at home in orange. When he returned to the works on Monday morning he took with him the sketches he had made showing 48 other ways of accomplishing the desired operation and laid them on the engineer's desk without a word. Subsequently one of these ideas with modifications suggested by some of the others was put into successful practice. Difficulties seemed to have a peculiar charm for Edison whether they relate to large or small things and although the larger matters have contributed most to the history of the arts the same carefulness of thought has often been the means of leading to improvements of permanent advantage even in minor details. For instance, in the very earliest days of electric lighting the safe insulation of two bare wires fastened together was a serious problem that was solved by him. An iron pot over a fire, some insulating material melted therein and narrow strips of linen drawn through it by means of a wooden clamp furnished a readily applied and adhesive insulation which was just as perfect for the purpose as the regular and now well-known insulating tape of which it was the forerunner. Dubious results are not tolerated for a moment in Edison's experimental work. Rather than pass upon an uncertainty the experiment will be dissected and checked minutely in order to obtain absolute knowledge pro and con. This searching method is followed not only in chemical or other investigations into which complexities might naturally enter but also in more mechanical questions where simplicity of construction might naturally seem to preclude possibilities of uncertainty. For instance, at the time when he was making strenuous endeavors to obtain copper wire of high conductivity, strict laboratory tests were made of samples sent by manufacturers. One of these samples tested out poorer than a previous lot furnished from the same factory. A report of this to Edison brought the following note. Perhaps the blank wire had a bad spot in it. Please cut it up into lengths and test each one and send results to me immediately. Possibly the electrical fraternity does not realize that this earnest work of Edison 28 years ago resulted in the establishment of the high quality of copper wire that has been the recognized standard since that time. Says Edison on this point. I furnished the expert and apparatus to the Ansonia Brasslin Copper Company in 1983 and he is there yet. It was this expert and this company who pioneered high conductivity copper for the electrical trade. Nor is it generally appreciated in the industry that the adoption of what is now regarded as a most obvious proposition, the high economy incandescent lamp, was the result of that characteristic foresight which there has been occasion to mention frequently in the course of this narrative. Together with the courage and horse sense which have always been displayed by the inventor in his persistent pushing out with far reaching ideas in the face of pessimistic options. As is well known, the lamps of the first 10 or 12 of years of incandescent lighting were of low economy but had long life. Edison's study of the subject had led him to the conviction that the greatest growth of the electric lighting industry would be favored by a lamp taking less current but having shorter, though commercially economical life. And after gradually making improvements along this line, he developed finally a type of high economy lamp which would introduce the most radical change in existing conditions and led ultimately to highly advantageous results. His start on this lamp and an expressed desire to have it manufactured for regular use filled even some of his business associates with dismay for they could see nothing but disaster ahead in forcing such a lamp on the market. His persistence and profound conviction of the ultimate results were so strong and his arguments so sound, however, that the campaign was entered upon. Although it took two or three years to convince the public of the correctness of his views, the idea gradually took strong route and has now become an integral principle of the business. In this connection it may be noted that with remarkable prescience, Edison saw the coming of the modern lamps of today which by reason of their small consumption of energy to produce a given candle power have dismayed central station managers. A few years ago a consumption of 3.1 Watts per candle power might safely be assumed as an excellent average and many stations fix their rates in business on such a basis. The results on income when the consumption as in the new metallic filament lamps drops to 1.25 Watts per candle can readily be imagined. Edison has insisted that central stations are selling light and not current and he points to the predicament now confronting them as truth of his assertion that when selling light they share in all the benefits of improvement but that when they sell current the consumer gets all those benefits without division. The dilemma is encountered by central stations in a bewildered way as a novel and unexpected experience but Edison foresaw the situation and warned against it long ago. It is one of the greatest gifts of statement ship to see new social problems years before they arise and solve them in advance. It is one of the greatest attributes of invention to foresee and meet its own problems in exactly the same way. End of Chapter 24 Recording by Kalinda in Raymond, New Hampshire on December 20th, 2007. Chapter 25 of Edison is life and inventions. This is a LibriVox recording. All LibriVox recordings are in the public domain. For more information or to volunteer please visit LibriVox.org. Your reader is Alec Datesman. Edison, his life and inventions by Frank Louis Dyer and Thomas Comerford Martin. Chapter 25. The Laboratory at Orange and the Staff. A living interrogation point and a born investigator from childhood, Edison has never been without a laboratory of some kind for upward of half a century. In youthful years, as already described in this book he became ardently interested in chemistry and even at the early age of 12 felt the necessity for a special look of his own where he could satisfy his unconvinced mind of the correctness or inaccuracy of statements and experiments contained in the few technical books then at his command. Ordinarily, he was like other normal lads of his age full of boyish, hearty enjoyments but with all possessed of an unquenchable spirit of inquiry and an insatiable desire for knowledge. Being blessed with a wise and discerning mother his aspirations were encouraged and he was allowed a corner in her cellar. It is fair to offer tribute here to her bravery as well as to her wisdom. For at times she was in mortal terror lest the precocious experimenter below should in his inexperience make some awful combination that would explode and bring down the house in ruins on himself and the rest of the family. Fortunately, no such catastrophe happened but young Edison worked away in his embryonic laboratory satisfying his soul and incidentally depleting his limited pocket money to the vanishing point. It was indeed owing to this latter circumstance that in a year or two, his aspirations necessitated an increase of revenue and a consequent determination to earn some money for himself led to his first real commercial enterprise as Candy Butcher on the Grand Trunk Railroad already mentioned in a previous chapter. It has also been related how his precious laboratory was transferred to the train, how he and it were subsequently expelled and how it was re-established in his home where he continued studies and experiments until the beginning of his career as a telegraph operator. The nomadic life of the next few years did not lessen his devotion to study but it stood seriously in the way of satisfying the ever-present craving for a laboratory. The lack of such a place never prevented experimentation however as long as he had a dollar in his pocket and some available hole in the wall. With the turning of the tide of fortune that suddenly carried him in New York in 1869 from poverty to the opulence of $300 a month he drew nearer to a realization of his cherished ambition in having money, place, and some time stolen from sleep for more serious experimenting. Thus matters continued until at about the age of 22 Edison's inventions had bought him a relatively large sum of money and he became a very busy manufacturer and a leaseee of a large shop in Newark, New Jersey. Now for the first time since leaving that boyish laboratory in the old home at Port Huron Edison had a place of his own to work in, to think in but no one in any way acquainted with Newark as a swarming center of miscellaneous and multitudinous industries would recommend it as a cloistered retreat for brooding reverie and introspection favorable to creative effort. Some people revel in surroundings of hustle and bustle and find therein no hindrance to great accomplishment. The electrical genius of Newark is Edward Weston who has thriven amid its turmoil and there has developed his beautiful instruments of precision just as brushworked out his arc lighting system in Cleveland or even as Faraday surrounded by the din and roar of London laid the intellectual foundations of the whole modern science of dynamic electricity. But Edison though deaf could not make too hurried to retreat from Newark to Menlo Park where as if to justify his change of base vinyl inventions soon came thick and fast year after year. The story of Menlo has been told in another chapter but the point was not emphasized that Edison then as later tried hard to drop manufacturing. He would infinitely rather be philosopher than producer but somehow the necessity of manufacturing is constantly thrust back upon him by a profound perhaps finical sense of dissatisfaction with what other people make for him. The world never saw a man more deeply and desperately convinced that nothing in it approaches perfection. Edison is the doctrine of evolution incarnate applied to mechanics. As to the removal from Newark he may be allowed to tell his own story. I had a shop at Newark in which I manufactured stock tickers and such things. When I moved to Menlo Park I took out only the machinery that would be necessary for experimental purposes and left the manufacturing machinery in place. It consisted of many milling machines and other tools for duplicating. I rented this to a man who had formerly been my bookkeeper who had thought he could make money out of manufacturing. There was about $10,000 worth of machinery. He was to pay me $2,000 a year for the rent of the machinery and keep it in good order. After I moved to Menlo Park I was very busy with the telephone and phonograph and I paid no attention to this little arrangement. About three years afterward it occurred to me that I had not heard at all from the man who had rented this machinery so I thought I would go over to Newark and see how things were going. When I got there I found that instead of being a machine shop it was a hotel. I have since been utterly unable to find out what became of the man or the machinery. Such incidents tend to justify Edison in his rather cynical remark that he has always been able to improve machinery much quicker than men. All the way up he has had discouraging experiences. One day while I was carrying on my work in Newark a Wall Street broker came from the city and said he was tired of the street and wanted to go into something real. He said he had plenty of money. He wanted some kind of a job to keep his mind off Wall Street. So we gave him a job as a mucker in chemical experiments. The second night he was there he could not stand the long hours and fell asleep on a sofa. One of the boys took a bottle of bromine and opened it under the sofa. It floated up and produced a violent effect on the mucus membrane. The broker was taken with such a fit of coughing he burst a blood vessel and the man who let the bromine out got away and never came back. I suppose he thought there was going to be a death but the broker lived and left the next day and I have never seen him since either. Edison tells also of another foolhardy laboratory trick of the same kind. Some of my assistants in those days were very green in the business as I did not care whether they had any experience or not. I generally tried to turn them loose. One day I got a new man and told him to conduct a certain experiment. He got a cord of ether and started to boil it over a naked flame. Of course it caught fire. The flame was about four feet in diameter and 11 feet high. We had to call out the fire department and they came down and put a stream through the window. That let all the fumes and chemicals out and overcame the firemen and there was the devil to pay. Another time we experimented with a tub full of soapy water and put hydrogen into it to make large bubbles. One of the boys who was washing bottles in the place had read in some book that hydrogen was explosive so he proceeded to blow the tub up. There was about four inches of soap in the bottom of the tub, 14 inches high and he filled it with soap bubbles up to the brim. Then he took a bamboo fish pole, put a piece of paper at the end and touched it off. He blew every window out of the place. Always a shrewd, observant and kindly critic of character, Edison tells many anecdotes of the men who gathered around him in various capacities at that quiet corner of New Jersey, Menlo Park and later at Orange in the Llewellyn Park Laboratory. And these serve to supplement the main narrative by throwing vivid side lights on the whole scene. Here, for example, is a picture drawn by Edison of a laboratory interlude, just a bit Rabilasian. When experimenting at Menlo Park, we had all the way from 40 to 50 men. They worked all the time. Each man was allowed from four to six hours sleep. We had a man who kept tally and when the time came for one to sleep, he was notified. At midnight, we had lunchboard in and served at a long table in which the experimenters sat down. I also had an organ which I procured from Hillborn Roosevelt, uncle of the ex-president and we had a man play this organ while we ate our lunch. During the summertime, after we had made something which was successful, I used to engage a bricks loop at Perth Amboy and take the whole crowd down to the fishing banks on the Atlantic for two days. On one occasion, we got outside Sandy Hook on the banks and anchored. A breeze came up, the sea became rough and a large number of the men were sick. There was straw in the bottom of the boat which we all slept on. Most of the men adjourned to this straw very sick. Those who were not got a piece of rancid salt pork from the skipper and cut a large thick slice out of it. This was put on the end of a fish hook and drawn across the men's faces. The smell was terrific and the effect added to the hilarity of the excursion. I went down once with my father and two assistants for a little fishing inside Sandy Hook. For some reason or other, the fishing was very poor. We anchored and I started into fish. After fishing for several hours, there was not a single bite. The others wanted to pull up anchor but I fished two days and two nights without a bite until they pulled up anchor and went away. I would not give up. I was going to catch that fish if it took a week. This is general. Let us quote one or two Pecan personal observations of a more specific nature as to the odd characters Edison drew around him in his experimenting. Down at Menlo Park, a man came in one day and wanted a job. He was a sailor. I hadn't any particular work to give him but I had a number of small induction coils and to give him something to do, I told him to fix them up and sell them among his sailor friends. They were fixed up and he went over to New York and sold them all. He was an extraordinary fellow. His name was Adams. One day I asked him how long it was since he had been to sea and he replied two or three years. I asked him how he had made a living in the meantime before he came to Menlo Park. He said he made a pretty good living by going around to different clinics and getting $10 at each clinic because of having the worst case of heart disease on record. I told him if that was the case he would have to be very careful around the laboratory. I had him there to help in experimenting and the heart disease did not seem to bother him at all. It appeared that he had once been a slaver and although he was a tough character having no other man I could spare at that time I sent him over with my carbon transmitter telephone to exhibit it in England. It was exhibited before the post office authorities. Professor Hughes spent an afternoon in examining the apparatus and in about a month came out with his microphone which was absolutely nothing more nor less than my exact invention but no mention was made of the fact that just previously he had seen the whole of my apparatus. Adams stayed over in Europe connected with the telephone for several years and finally died of too much whiskey but not of heart disease. This shows how whiskey is the more dangerous of the two. Adams said that at one time he was aboard a coffee ship in the harbor of Santos, Brazil. He fell down a hatchway and broke his arm. They took him up to the hospital, a Portuguese one, where he could not speak the language and they did not understand English. They treated him for two weeks for yellow fever. He was certainly the most profane man we ever had around the laboratory. He stood high in his class. And there were others of a different stripe. We had a man with us at Menlo Park called Segredor. He was a queer kind of fellow. The men got in the habit of pleaking him and finally one day he said to the assembled experimenters in the top room of the laboratory, the next man that doesn't, I will kill him. They paid no attention to this and next day one of them made some a sarcastic remark to him. Segredor made a start for his boarding house and when they saw him coming back up the hill with a gun, they knew there would be trouble. So they all made for the woods. One of the men went back and mollified him. He returned to his work, but he was not teased anymore. At last, when I sent men out hunting for bamboo, I dispatched Segredor to Cuba. He arrived in Havana on Tuesday and on the Friday following he was buried, having died of the black vomit. On the receipt of the news of his death, half a dozen of the men wanted his job. But my searcher in the Aster Library reported that the chances of finding the right kind of bamboo for lamps in Cuba were very small. So I did not send a substitute. Another thumbnail sketch made of one of his associates is this, when experimenting with vacuum pumps to exhaust the incandescent lamps, I required some very delicate and close manipulation of glass and hired a German glassblower who was said to be the most expert man of his kind in the United States. He was the only one who could make clinical thermometers. He was the most extraordinarily conceited man I have ever come across. When his conceit was so enormous, life was made a burden to him by all the boys around the laboratory. He once said that he was educated in a university where all the students belonged to families of the aristocracy and the highest class in the university all wore little red caps. He said he wore one. Of somewhat different caliber was honest John Cruisy who first made his mark at Menlo Park and of whom Edison says, one of the workmen I had at Menlo Park was John Cruisy who afterward became from his experience engineer of the lighting station and subsequently engineer of the Edison General Electric Works at Schenectady. Cruisy was very exact in his expressions. At the time we were promoting and putting up electric light stations in Pennsylvania, New York and New England, there would be delegations of different people who proposed pay for these stations. They would come to our office in New York at 65 to talk over the specifications, the cost and other things. At first, Richard Cruisy was bought in but whenever a statement was made which he could not understand or did not believe could be substantiated, he would blurt right out among these prospects that he didn't believe it. Finally, it disturbed these committees so much and raised so many doubts in their minds that one of my chief associates said, here, Cruisy, we don't want you to come to these meetings any longer. You are too painfully honest. I said to him, we always tell the truth. It may be deferred truth, but it is the truth. He could not understand that. Various reasons conspired to cause the departure from Menlo Park midway in the 80s. For Edison, in spite of the achievement with which its name will forever be connected, it had lost all its attractions and all its possibilities. It had been outgrown in many ways and straight as the remark may seem, it was not until he had left it behind and had settled in Orange, New Jersey that he could be said to have given definite shape to his life. He was only 40 in 1887 and all that he had done up to that time, tremendous as much of it was, and worn a haphazard Bohemian heir with all the inconsequential freedom and crudeness somehow attaching to pioneer life. The development of the new laboratory in West Orange, just at the foot of Llewellyn Park on the Orange Mountains, not only marked the happy beginning of a period of perfect domestic and family life, but saw in the planning and equipment of a model laboratory plant the consummation of youthful dreams and of the keen desire to enjoy resources adequate at any moment to whatever strain the fierce fervor of research might put upon them. Curiously enough, while hitherto Edison had sought to dissociate his experimenting from his manufacturing, here he determined to develop a large industry to which a thoroughly practical laboratory would be a central feature and ever a source of suggestion and inspiration. Edison's standpoint today is that an evil to be dreaded in manufacture is that of over standardization and that as soon as an article is perfect that is the time to begin improving it but he who would improve must experiment. The Orange laboratory, as originally planned, consisted of a main building 250 feet long and three stories in height, together with four other structures, each 100 by 25 feet and only one story in height. All of these were substantially built of brick. The main building was divided into five chief divisions, the library, office, machine shops, experimental and chemical rooms, and stock room. The use of the smaller buildings will be presently indicated. Surrounding the hall was erected a high picket fence with a gate placed on Valley Road. At this point, a gatehouse was provided and put in charge of a keeper. For then, as at the present time, Edison was greatly sought after and in order to accomplish any work at all, he was obliged to deny himself to all but the most important callers. The keeper of the gate was usually chosen with reference to his capacity for stony-hearted implacability and adherence to instructions and this choice was admirably made in one instance when a new gateman, not yet thoroughly initiated, refused admittance to Edison himself. It was of no use to try and explain. To the gateman, everyone was persona non grata without proper credentials and Edison had to wait outside until he can get someone to identify him. On entering the main building, the first doorway from the ample passage leads the visitor into a handsome library finished throughout in yellow pine, occupying the entire width of the building and almost as broad as long. The center of this spacious room is an open rectangular space about 40 by 25 feet, rising clear about 40 feet from the main floor to a paneled ceiling. Around the sides of the room, bounding this open space, run two tiers of gallery divided as is the main floor beneath them into alcoves of liberal dimensions. These alcoves are formed by racks extending from floor to ceiling, fitted with shelves except on two sides of both galleries where they are formed by a series of glass-fronted cabinets containing extensive collections of curious and beautiful mineralogical and geological specimens, among which is the notable Tiffany Kuhn's collection of minerals acquired by Edison some years ago. Here and there in these cabinets may also be found a few models which he has used at times in his studies of anatomy and physiology. The shelves on the remainder of the upper gallery and part of those on the first gallery are filled with countless thousands of specimens of ores and minerals of every conceivable kind gathered from all parts of the world and all tagged and numbered. The remaining shelves of the first gallery are filled with current numbers and some back numbers of the numerous periodicals to which Edison subscribes. Here may be found the popular magazines together with those of a technical nature relating to electricity, chemistry, engineering, mechanics, building, cement, building materials, drugs, water and gas, power, automobiles, railroads, aeronautics, physiology, philosophy, hygiene, physics, telegraphy, mining, metallurgy, metals, music and others. Also theatrical weeklies as well as the proceedings and transactions of various learned and technical societies. The first impression received as one enters on the main floor of the library and looks around is that of noble proportions and symmetry as a whole. The open central space of liberal dimensions and height flanked by the galleries and relieved by four handsome electric lighting fixtures suspended from the ceiling by long chains conveys an idea of lofty spaciousness while the huge open fireplace surmounted by a great clock built into the wall at one end of the room. The large rugs, the armchairs scattered around, the tables and chairs in the alcoves give a general air of comfort combined with utility. In one of the larger alcoves at the sunny end of the main hall is Edison's own desk where he may usually be seen for a while in the early morning hours looking over his mail or otherwise busily working on matters requiring his attention. At the opposite end of the room not far from the open fireplace is a long table surrounded by swivel desk chairs. It is here that directors meetings are sometimes held and also where weighty matters are often discussed by Edison at conference with his closer associates. It has been the privilege of the writers to be present at some of these conferences not only as participants but in some cases as lookers on while awaiting their turn. On such occasions an interesting opportunity is afforded to study Edison in his intense and constructive moods. Apparently oblivious to everything else he will listen with concentrated mind and close attention and then pour forth a perfect torrent of ideas and plans. And if the occasion calls for it will turn around to the table sees a writing pad and makes sketch after sketch with lightning like rapidity tearing off each sheet as filled and tossing it aside to the floor. It is an ordinary indication that there has been an interesting meeting when the caretaker about fills a wastebasket with these discarded sketches. Directly opposite the main door is a beautiful marble statue purchased by Edison at the Paris Exposition in 1889 on the occasion of his visit there. The statue, mounted on a base three feet high is an allegorical representation of the supremacy of electric light over all other forms of illumination carried out by the life-size figure of a youth with half-spread wings seated upon the ruins of a street gas lamp holding triumphantly high above his head in electric incandescent lamp. Grouped about his feet are a gear wheel, voltaic pile, telegraph key, and telephone. This work of art was executed by A. Bordiga of Rome and held the prominent place in the department devoted to Italian art at the Paris Exposition and naturally appealed to Edison as soon as he saw it. In the middle distance between the entrance door and the statue has long stood a magnificent palm but at the present writing it has been set aside to give place to a fine model of the first type of the Edison poured cement house which stands in a miniature artificial lawn upon a special table prepared for it. While on the floor at the foot of the table are specimens of the full-size molds in which the house will be cast. The balustrades of the galleries and all other available places are filled with portraits of great scientists and men of achievement as well as with pictures of historic and scientific interests. Over the fireplace hangs a large photograph showing the Edison cement plant in its entire length flanked on one end of the mantle by a boast of Humboldt and on the other by a statuette of Sandau the latter having been presented to Edison by the celebrated athlete after a visit he made to Orange to pose for the emotion pictures in the earliest days of their development. While looking up under the second gallery at the end has seen a great role resting in sockets placed on each side of the room. There is a huge screen or curtain which may be drawn down to the floor to provide a means of projection for lantern slides or motion pictures for the entertainment or instruction of Edison and his guests. In one of the larger alcoves is a large terrestrial globe pivoted in its special stand together with a relief map of the United States and here and there are handsomely mounted specimens of underground conductors and electric wells that were made at the Edison machine works at Schenectady before it was merged into the General Electric Company. On two pedestals stand respectively two other mementos of the works one a 15 light dynamo of the Edison type and the other an elaborate electric fan both of them gifts from associates or employees. In noting these various objects of interest one must not lose sight of the fact that this part of the building is primarily a library if indeed that fact did not at once impress itself by a glance at the well-filled unglazed bookshelves in the alcoves of the main floor. Here Edison's Catholic taste in reading becomes apparent as one scans the titles of thousands of volumes ranged upon the shelves for they include astronomy, botany, chemistry, dynamics, electricity, engineering, forestry, geology, geography, mechanics, mining, medicine, metallurgy, magnetism, philosophy, psychology, physics, steam, steam engines, telegraphy, telephony and many others. Besides these there are the journals and proceedings of numerous technical societies and psychopedias of various kinds found series of important technical magazines a collection of United States and foreign patents embracing some hundreds of volumes together with an extensive assortment of miscellaneous books of special and general interest. There is another big library up in the house on the hill. In fact, there are books upon books all over the home and wherever they are those books are read. As one is about to pass out of the library attention is arrested by an incongruity in the form of a cot which stands in an alcove near the door. Here Edison, throwing himself down sometimes seeks a short rest during specially long working tours. Sleep is practically instantaneous and profound and he awakes in immediate and full possession of his faculties arising from the cot and going directly back to the job without a moment's hesitation just as a person wide awake would arise from a chair and proceed to attend to something previously determined upon. Immediately outside the library is the famous stock room about which much has been written and invented. It's fame arose from the fact that Edison planned it to be a repository of some quantity great or small of every known and possibly useful substance not readily perishable together with the most complete assortment of chemicals and drugs that experience and knowledge could suggest. Always strenuous in his experimentation and the living embodiment of the spirit of the song I want what I want when I want it. Edison had known for years what it was to be obliged to wait and sometimes lack or some substance or chemical that he thought necessary to the success of an experiment. Naturally impatient at any delay which intersposed in his insistent and searching methods and realizing the necessity of maintaining the inspiration attending his work at any time he determined to have within his immediate reach the natural resources of the world. Hence it is not surprising to find the stock room not only a museum but a sample room of nature as well as a supply department. To a casual visitor the first view of this heterogeneous collection is quite bewildering but on more mature examination it resolves itself into a natural classification as for instance objects pertaining to various animals birds and fishes such as skins, hides, hair, fur, feathers, wool, quills, down, gristles, teeth, bones, hoofs, horns, tusks, shells, natural products such as woods, barks, roots, leaves, nuts, seeds, herbs, gums, grains, flowers, meals, bran. Also minerals in great assortment mineral and vegetable oils, clay, mica, ozokirite, etc. In the line of textiles cotton and silk threads in great variety with woven goods of all kinds from cheese cloth to silk plush. As for paper there is everything in white and colored from thinnest tissue up to the heaviest asbestos even a few newspapers always being on hand. Twines of all sizes, inks, waxes, cork, tar, resin, pitch, turpentine, asphalt, plumbago, glass and sheets and tubes and a host of miscellaneous articles revealed on looking around the shelves as well as an interminable collection of chemicals including acids, alkalis, salts, regents, every conceivable essential oil and all the thinkable extracts. It may be remarked that this collection includes the 1800 or more fluorescent salts made by Edison during his experimental search for the best material for a fluoroscope in the initial x-ray period. All known metals in form of sheet, rod and tube and of great variety and thickness are here found also together with the most complete assortment of tools and accessories for machine shop and laboratory work. The list is confined to the merits general mention of the scope of this remarkable and interesting collection and specific details would stretch out into a catalog of no small proportions. When it is stated however that a stock clerk has kept exceedingly busy all day answering the numerous and various demands upon him the reader will appreciate that this comprehensive assortment is not merely a fad of Edison's but stands rather as a substantial tribute to his wide-angled view of possible requirements as his various investigations take him far field. It has no counterpart in the world. Beyond the stock room and occupying about half the building on the same floor lie a machine shop, engine room and boiler room. This machine shop is well equipped and in it is constantly employed a large force of mechanics whose time is occupied in constructing the heavier class of models and mechanical devices called for by the varied experiments and inventions always going on. Immediately above on the second floor is found another machine shop in which is maintained a core of expert mechanics who are called upon to do work of greater precision and fineness in the construction of tools and experimental models. This is the room presided over lovingly by John F. Ott who has been Edison's designer of mechanical devices for over 40 years. He still continues to ply his craft with unabated skill and oversees the work of the mechanics as his productions are wrought into concrete shape. In one of the many experimental rooms lining the sides of the second floor may usually be seen his younger brother Fred Ott whose skill as a dexterous manipulator and ingenious mechanic has found ample scope for exercise during the 32 years of his service with Edison, not only at the regular laboratories but also at that connected with the inventor's winter home in Florida. Still another of the Ott family, the son of John F. for some years past has been on the experimental staff at the Orange Laboratory. Although possessing in no small degree the mechanical and manipulative skill of the family he has chosen chemistry as his special domain and may be found with the other chemists in one of the chemical rooms. On this same floor is the vacuum pump room with a glass blower's room adjoining. Both of them historic by reason of the strenuous work done on incandescent lamps and x-ray tubes within their walls. The tools and appliances are kept intact for Edison calls occasionally for their use in some of his later experiments and there is a suspicion among the laboratory staff that someday he may resume work on incandescent lamps. Adjacent to these rooms are several others devoted to physical and mechanical experiments together with a drafting room. Last to be mentioned but the first in order as one leaves the head of the stairs leading up to this floor is number 12, Edison's favorite room where he will frequently be found. Plain of aspect being merely his space boarded off with tongued and grooved planks as all the other rooms are, without ornament or floor covering and containing only a few articles of cheap furniture, this room seems to exercise a nameless charm for him. The door is always open and often he could be seen seated at a plain table in the center of the room deeply intent on some of the numerous problems in which he is interested. The table is usually pretty well filled with specimens or data of experimental results which have been put there for his examination. At the time of this writing, these specimens consist largely of sections of the positive elements of the storage battery together with many samples of nickel hydrate to which Edison devotes deep study. Close at hand is a microscope which is in frequent use by him in these investigations. Around the room on shelves are hundreds of bottles each containing a small quantity of nickel hydrate made in as many different ways each labeled correspondingly. Always at hand will be found one or two of the laboratory notebooks with frequent entries or comments in the handwriting which one seen is never forgotten. Number 12 is at times a chemical, a physical or a mechanical room. Occasionally a combination of all while sometimes it might be called a consultation room or a clinic. For often Edison may be seen there in animated conference with a group of his assistants but his chief distinction lies in its being one of his favorite haunts and in the fact that within its walls have been settled many of the perplexing problems and momentous questions that have brought about great changes in electrical and engineering arts during the 20 odd years that have elapsed since the Orange Laboratory was built. Passing now to the top floor the visitor finds himself at the head of a broad hall running almost the entire length of the building and lined mostly with glass fronted cabinets containing a multitude of experimental incandescent lamps and an immense variety of models of phonographs, motors, telegraph and telephone apparatus, meters and a host of other inventions upon which Edison's energies have at one time and another been bent. Here also are other cabinets containing old papers and records while further along the wall are piled up boxes of historical models and instruments. In fact, this hallway with its conglomerate contents may well be considered a scientific attic. It is hoped that at no distant day these Edison eanna will be assembled and arranged in a fireproof museum for the benefit of posterity. In the front end of the building and extending over a library is a large room intended originally and used for a time as the phonograph music hall for record making but now used only as an experimental room for phonograph work as the growth of the industry has necessitated a very much larger and more central place where records can be made on a commercial scale. Even the experimental work imposes no slight burden on it. On each side of the hallway above mentioned, rooms are partitioned off and used for experimental work of various kinds mostly phonographic. Although on this floor are also located the storage battery testing room, a chemical and physical room and Edison's private office where all his personal correspondence and business affairs are conducted by his personal secretary, Mr. H. F. Miller. A visitor to this floor of the laboratory building cannot but be impressed with the consciousness of the incessant efforts that are being made to improve the reproducing qualities of the phonograph as he hears from all sides the sounds of vocal and instrumental music constantly varying in volume and timber due to changes in the experimental devices under trial. The traditions of the laboratory include cuts placed in many of the rooms of these upper floors but that was in the earlier years when the strenuous scenes of Menlo Park were repeated in the new quarters. Edison and his closest associates were accustomed to carry their laborers far into the wee small hours and when physical nature demanded a respite from work, a short rest would be obtained by going to bed on a cot. One would naturally think that the wear and tear of this intense application day after day and night after night would have tended to induce a heaviness and gravity of demeanor in these busy men but on the contrary, the old spirit of good humor and prankishness was ever present as its frequent outbursts manifested from time to time. One instance will serve as an illustration. One morning, about 2.30, the late Charles Bachelor announced that he was tired and would go to bed. Leaving Edison and the others busily working, he went out and returned quietly in slippered feet with his nightgown on, the handle of a feather duster stuck down his back with the feathers waving over his head and his face marked. With unearthly howls and shrieks, Lenindian, he practiced about the room incidentally giving Edison a scare that made him jump from his work. He saw the joke quickly, however, and joined in the general merriment caused by this prank. Leaving the main building with its core of busy experimenters and coming out into the spacious yard, one notes the four long single-story brick structures mentioned above. The one nearest the Valley Road is called the Galvanometer Room and it was originally intended by Edison to be used for the most delicate and minute electrical measurements in order to provide rigid resting places for the numerous and elaborate instruments to be at purchase for this purpose. The building was equipped along three-quarters of its length with solid pillars or tables of bricks set deep in the earth. These were built up to a height of about two and a half feet and each was surmounted with a single heavy slab of black marble. A cement floor was laid and every precaution was taken to render the building free from all magnetic influences so that it would be suitable for electrical work of the utmost accuracy and precision. Hence, iron and steel were entirely eliminated in its construction, copper being used for fixtures for steam and water piping, and indeed for all other purposes where metal was employed. This room was for many years the headquarters of Edison's able assistant, Dr. A.E. Kennelly, now professor of electrical engineering at Harvard University to whose energetic and capable management were entrusted many scientific investigations during his long sojourn at the laboratory. Unfortunately, however, for the continuous success of Edison's elaborate plans, he had not been many years established in the laboratory before a trolley road through West Orange was projected and built, a line passing through the plant and within 75 feet of the galvanometer room, thus making it practically impossible to use it for the delicate purposes for which it was originally intended. For some time past, it has been used for photography and some special experiments on motion pictures as well as for demonstrations connected with physical research, but some reminders of its old-time glory still remain in evidence. In lofty and capacious glass and close cabinets in company with numerous models of Edison's inventions, he repos many of the costly and elaborate instruments rendered useless by the ubiquitous trolley. Instruments are all about on walls, tables, and shelves. The photometer is covered up. Induction coils of various capacities with other electrical paraphernalia lie around almost as if the experimenter were absent for a few days but would soon return and resume his work. In numbering the group of buildings, the galvanometer room is number one. While the other single-story structures are numbered respectively two, three, and four. On passing out of number one and proceeding to the succeeding building is noticed between the two, a garage of ample dimensions and a smaller structure at the door of which stands a concrete mixer. In this small building, Edison has made some of his most important experiments in the process of working out his plans for the poured house. It is in this little place that there was developed the remarkable mixture which is the place so vital apart in the successful construction of these everlasting homes for living millions. Drawing near to building two, the whole factory evidence presents itself of the immediate vicinity of a chemical laboratory. This is confirmed as one enters the door and finds that the entire building is devoted to chemistry. Long rows of shelves and cabinets filled with chemicals lie in the room, a profusion of retorts, olympics, filters, and other chemical apparatus on numerous tables and stands greet the eye while a core of experimenters may be seen busy in the preparation of various combinations, some of which are boiling or otherwise cooking under their dexterous manipulation. It would not require many visits to discover that in this room also, Edison has a favorite nook. Down at the far end in a corner are a plain little table and chair, and here he is often to be found deeply immersed in a study of the many experiments that are being conducted. Not infrequently, he is actively engaged in the manipulation of some compound of special intricacy, whose results might be illuminative of obscure facts, not patent to others than himself. Here too is a select little library of chemical literature. The next building, number three, has a double mission, the father half being partitioned off for a pattern making shop, while the other half is used as a storeroom for chemicals in quantity and for chemical apparatus and utensils, a grimly humorous incident as related by one of the laboratory staff attaches to number three. It seems that some time ago, one of the helpers in the chemical department, an excitable foreigner, became dissatisfied with his wages, and after making an unsuccessful application for an increase, rushed in desperation to Edison and said, F, I not get more money, I go to take the cyanide potassium. Edison gave him one quick searching glance and detecting a bluff, replied in an offhand manner, there is a five pound bottle in number three and turned to his work again. The foreigner did not go to get the cyanide but gave up his job. The last of these original buildings, number four, was used for many years in Edison's or concentrating experiments and also for rough and ready operations of other kinds such as furnace work and the like. At the present writing, it is used as a general stock room. In the foregoing details, the reader has been afforded but a passing glance at the great practical working equipment which constitutes the theater of Edison's activities. Four, in taking a general view of such a unique and comprehensive laboratory plant, it's salient features only can be touched upon to advantage. It would be but repetition to enumerate here the practical results of the laboratory work during the past two decades as they appear on other pages of this work. Nor can one assume for a moment that the history of Edison's laboratory is a closed book. On the contrary, its territorial boundaries have been increasing step-by-step with the enlargement of its labors. Until now, it has been obliged to go outside its own proper domains to occupy some space in and about the great Edison industrial buildings and space immediately adjacent. It must be borne in mind that the laboratory is only the core of a group of buildings devoted to the production on a huge scale by hundreds of artisans. Incidental mention has already been made of the laboratory at Edison's winter residence in Florida, where he goes annually to spend a month or six weeks. This is a miniature copy of the Orange laboratory with its machine shop, chemical room, and general experimental department. While it is only in use during his sojourn there and carries no extensive core of assistance, the work done in it is not of a perfunctory nature but is a continuation of his regular activities and serves to keep him in touch with the progress of experiments at Orange and enables him to give instructions for their variation and continuance as their scope is expanded by his own investigations made while enjoying what he calls vacation. What Edison in Florida speaks of as loafing would be for most of us extreme and healthy activity in the cooler far north. A word or two may be devoted to the visitors received at the laboratory and to the correspondence. It might be injudicious to gauge the greatness of a man by the number of his callers or his letters, but they are at least an indication of the degree to which he interests the world. In both respects for these 40 years, Edison has been a striking example of the manner in which the sentiment of hero worship can manifest itself and of the deep desire of curiosity to get satisfaction by personal observation or contact. Edison's mail like that of most well-known men is extremely large but composed in no small degree of letters, thousands of them yearly, that concern only the writers and might well go to the waste paper basket without prolonged consideration. The serious and important part of the mail, some personal and some business, occupies the attention of several men, all such letters finding their way promptly into the proper channels, often with a pithy endorsement by Edison scribbled on the margin. What to do with a host of others it is often difficult to decide, even when written by cranks who imagine themselves subject to strange electrical ailments from which Edison alone can relieve them. Many people write asking his opinion as to a certain invention or offering him an interest in it if he will work it out. Other people abroad ask his help in locating lost relatives and many want advice as to what they shall do with their sons, frequently butting geniuses whose ability to wire rebel has demonstrated unusual qualities. A great many persons want autographs and some would like photographs. The amazing thing about it all is that this flood of miscellaneous letters flows on in one steady uninterrupted stream year in and year out. Always a curious psychological study in its variety and volume and ever a proof of the fact that once a man has become established as a personality in the public eye and mind, nothing can stop the tide of correspondence that will deluge him. It is generally in the nature of things easier to write a letter than to make a call and the semi-retirement of Edison at a distance of an hour by train from New York stands as a means of protection to him against those who would certainly present their respects in person if he could be got at without trouble. But it may be less time consuming than his epistolary besiegers. It is the common experience of any visitor to the laboratory that there are usually several persons ahead of him no matter what the hour of the day and some whose business has been sufficiently vital to get them inside the porter's gate or even into the big library and lounging room. Celebrities of all kinds and distinguished foreigners are numerous, princes, noblemen, ambassadors, artists, literatures, scientists, financiers, women. A very large part of the visiting is done by scientific bodies and societies and then the whole place will be turned over to hundreds of eager, well-dressed men and women anxious to see everything and to be photographed in the big courtyard around the central hero. Nor are these groups and delegations limited to this country for even large parties of English, Dutch, Italian, or Japanese visitors come from time to time and are greeted with the same ready hospitality. Although Edison, it is easy to see, is torn between the conflicting emotions of a desire to be courteous and an anxiety to guard the precious hours of work or watch the critical stage of a new experiment. One distinct group of visitors has always been constituted by the newspaper men. Hardly a day goes by that the journals do not contain some reference to Edison's work or remarks and the items are generally based on an interview. The reporters are never away from the laboratory very long for if they have no actual mission of inquiry there is always the chance of a good story being secured offhand and the easy, inveterate good nature of Edison toward reporters is proverbial in the craft. Indeed, it must be stated here that once in a while this confidence has been abused, that stories have been published utterly without foundation, that interviews have been printed which never took place, that articles with Edison's name as author have been widely circulated although he never saw them and that in such ways he has suffered directly. But such occasional incidents tend to know wise to lessen Edison's warm admiration of the press or his readiness to avail himself of it whenever a representative goes over to Orange to get the truth or the real facts in regard to any matter of public importance. As for the newspaper clippings containing such articles or others in which Edison's name appears, they are literally like sands of the seashore for number and the archives of the laboratory that preserve only a very minute percentage of them are a further demonstration of what publicity means when a figure like Edison is concerned. End of chapter 25, recording by Alec Datesman, Brooklyn, New York.