Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Uploaded on Nov 7, 2010
Early calculating devices and computers used mechanical digital to analogue converters. This video describes one based on an arrangement of metal bars called a "whiffletree" - also sometimes called a "whippletree." It shows, briefly, the whiffletree used in IBM's revolutionary selectric typewriter and then illustrates the principles of a whiffletree converter by showing the simplest one - one that encodes digital impulses into two bits of information. (This videos is an appendix to Bill Hammack's video about the operation of the Selectric Typewriter.)