Graphic Method of Studying Sounds Using a Vibroscope
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“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
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Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 238
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