Dictaphone cylinder machine



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English: Photo of a Dictaphone wax cylinder dictation machine, made by Columbia Graphophone Company in the 1920s. The user pressed a button on the mouthpiece, which started the cylinder turning, and spoke into it. The sound travelled down the tube and vibrated a membrane attached to a needle cutting a groove in the wax surface of the cylinder. The needle inscribes a record of the sound vibrations into the cylinder. To replay it, the mouthpiece was detached and replaced with a pair of 'stethoscope' type earphones. Each wax cylinder can hold about 1200-1500 words, and can be reused 100-120 times by erasing it with a machine that 'shaves' the surface off. Alterations: removed caption, erased noise in white areas, increased brightness.
Date 1922(1922)
Source Downloaded 2008-1-12 from Clarence Charles Smith (1922) The Expert Typist, MacMillan Co., New York, USA, p.123, fig.37 on Google Books. The photo is credited (p.122) to the Columbia Phonograph Co.
Author Columbia Phonograph Co.
(Reusing this file)

Public domain - published in USA before 1923.


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