Gray Audograph
(Redirected from Audograph)
The Gray Audograph was a dictation machine format introduced in 1945. It recorded sound by pressing grooves into soft vinyl discs.[1][2]
The Audograph recorded on thin vinyl discs of 15cm diameter, recording from the inside to the outside, the opposite of conventional gramophone records. Unlike conventional records, the disc was driven by a surface-mounted wheel. This meant that its recording and playback speed decreased toward the edge of the disc (like the Compact Disc and other digital formats), to keep a more constant linear velocity and to improve playing time,[3] which was ten minutes.[4]
In 1950, Gray began to make a variant of the Audograph for AT&T, known as the Peatrophone.[5]
References
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- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ The 78rpm Home Page - Center-Start 78s
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). A late 1950s model which used transistors.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
External links
[edit | edit source]- Restoring Gray Audograph recordings Archived 2017-09-03 at the Wayback Machine
- Image of Audograph catalog
