Dewitt Tourbillon Force Constante

[Kg277]

My $12.95 Casio is gonna get far greater accuracy than these things..

[picaticatara]

that makes me moist

[mithsel21]

What a quintessential melding of technology & art.

[fredderf12345]

simply beautiful work....its art combined with past/present human ingenuity ...the people who bring these kind of time pieces to life are more than above normal humans...amazing feet(and i wear a 15)

[RollaArtis]

Nice video but I hope this watch has a very fast train, otherwise the timekeeping won't be so good because of the miniscule balance. It's no good loading it with heavy metal weights - it s the velocity which matters. I have a high oscillation velocity quartz watch which cost 10 quid 20 years ago - keeps perfect time.

[Dystopiologist]

@RollaArtis,

You can see that it's at least 21,600 bps. But a fast train doesn't necessarily mean better timekeeping. Some mechanical wathches keep better time than do quartz watches. Also, don't forget that the Bulova Accutron (400 Hz? somewhere around there...) could not obtain a Chronometer certificate.

[RollaArtis]

@Dystopiologist Yes you're right, it's not the fast train that matters but the velocity at the outer diameter of the balance, in this case not much, compared to a normal sized balance. Also the escapement error is also quite large because the escape wheel/balance diameter ratio is low. I would guess that the Bulova Accutron could not get a 'Chronometre' certificate because it wasn't produced in Switzerland.

[Dystopiologist]

@RollaArtis,

Accuracy is a matter of assessing ALL the various errors, and both minimizing them and even setting them against themselves. Velocity of the balance is only a small part of the equation.

.

The Bulova accutron, a ground-breaking watch (which didn't have a balance), could not get a chronometer certificate because it had a massive poise error in two positions. I was produced in Switzerland.

[Dystopiologist]

@Dystopiologist

.

Correction: Last sentence should read "It was produced in Switzerland".

[RollaArtis]

@Dystopiologist Interesting what you say about the Accutron, I know it had errors associated with air pressure so it's likely the Swiss testing observatory was up a mountain.

You're right about assessing all the various errors but it doesn't help if the thing is badly designed to begin with, in the pursuit of gimmickry over sound mechanical theory.

[Dystopiologist]

@RollaArtis , No, no - the Accutron was a tuning fork watch! It was landmark - the world's first electronic watch (one transistor) - but when the tines of the fork faced up or down, they had a poise error that was just enough to throw them out of the running. The Swiss later solved this problem with a counterpoised tuning fork (the ESA 9162).

My point is that all the various factors that influence accuracy have to be weighed against eachother; mere velocity of the balance is just one factor.

[RollaArtis]

@Dystopiologist Yes I know it was a tuning fork watch - my dad bought one of the first produced around 1965? with a see through dial, it was THE thing to have. The text book I studied years ago said that it had errors related to air pressure, I also remember the manufacture of the index wheel was problematic as it was made of artificial ruby.

[Dystopiologist]

@RollaArtis,

You know, I think you're right - it did have a pressure-related error. I'm guessing that the air-mass around the tuning fork would cause a gain in rate as the air thinned out. But that couldn't have been much; perhaps it was worried about with regard to the space program.

.

But poise error was the reason it couldn't obtain a "chronometre" certificate. If the tines faced down, it gained time; if they faced up, it lost time.

[Dystopiologist]

@RollaArtis "see through dial"? That's the "Spaceview"! They're still around; you should pick one up just for fun! The index wheel isn't ruby (I believe it's beryllium-bronze), but it was an engineering feat. I heard something about ruby tools used to produce it; I don't know.

[toranamunter]

@Dystopiologist seriously? please tell me more about the mechanical watch that is more accurate than quartz, I dont believe you

[RecordableID]

Me likei

[jensonvaughan]

great animation, but how about showing the actual watch! lol

[ziogisss]

is this like perpetuum mobile? you don't need to wind it?

[variousCore]

What is this song?

[biowerks]

I think it would look nicer with a metal bracelet.

[lolcat23]

Personally, i dont like when the outer rim of the cage is being used to drive the cage. i much prefer a petit moyenne which goes under the roue fix. that way you can bevel the edge of the cage.

[PhantomMigKiller]

@lolcat23 Well, if you say so...

[DuttonWebb]

incredible!

[helipilot27]

I think thats more impressive than a Gyro tourbillon

[lolcat23]

the force constant has little to do with the actuall escapment, and as such, has little to do with if its a tourbillon, gyro or otherwise.

[douro20]

It was designed in cooperation with BnB Concept SA. It uses their 3/4-sector escape wheel.

[sentrarob]

Speechless!!!

[Zingo33]

Review? More like a commercial.

The tourbillon looks cool though.

[ayuboaxx]

If I owned this I would just watch it all day, seriously.

[Descalabro]

Even when I bought a Citizen Calibre 8651 MoonPhase with leather bracer I spent days looking at it; I can't even imagine how long would be looking at the marvel in the video.

[PhantomMigKiller]

@ayuboaxx Heck- if i owned a watch like this, I would be scared to death of either LOSING it or BREAKING it-! CRUMBS, Dangermouse!

[Sokonomi]

a watch presentation of nearly 5 minutes of movie production value 3D animated shots, whoo.. I dont even wanna know the pricetag on the actuall watch. :')