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Chart illustrating 45 hand positions representing sounds in the English language as described in the Lyon Phonetic Manual.

Code of English Sounds

Chart illustrating 45 hand positions representing sounds in the English language as described in the…

"The graphic method of studying sounds, which fairly meets even the exacting demands of physicists, and is largely used by them may be briefly explained thus: Suppose the smoked plate [shown] to be a sheet of smoked paper fastened around a cylinder that is mounted that, when it is turned by a crank, the screw cut upon the axis moves the cylinder endwise as shown. Such and instrument is called a vibroscope." -Avery 1895

Graphic Method of Studying Sounds Using a Vibroscope

"The graphic method of studying sounds, which fairly meets even the exacting demands of physicists,…