In a message dated 6/3/2009 6:17:24 P.M. Eastern Daylight Time,
[log in to unmask] writes:
There is a device at Greenfield Village here in Michigan that is a pair
of flat copper discs -- square -- on paired turntables. This is an
Edison device which I believe Gelatt cited as an intermediary one on the
way to the phonograph.
This is probably Edison's 213,554, for preserving and transferring
telegraphic 'messages.' It was executed on Feb 3, 1877, and filed on March 25th.
The # actually does appear on Edison's North American cylinder phonographs of
1888, so he apparently considered it of sufficient 'legal' purpose.
It mentions both indenting and embossing, but there is no reference to
sound or the human voice. Conceptually, it introduces the disc and volute
(there were strip recorders in 1860 for Morse code), and this kind of process
is almost endless, when one looks for inventive origins. I still like July
18, 1877 for Edison's own Eureka moment (recording and reproducing the
human voice). At least he thought so - at the time, which should count for