Image:Dictaphone cylinder machine.jpg
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Dictaphone_cylinder_machine.jpg (672 × 540 pixels, file size: 87 KB, MIME type: image/jpeg)
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[edit] Summary
| Description |
Photo of a Dictaphone wax cylinder dictation machine, made by Columbia Phonograph Co. 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, as in a phonograph record. 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. |
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| 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. |
| Date |
1922 |
| Author |
Columbia Phonograph Co. |
| Permission (Reusing this image) |
Public domain - published in USA before 1923. |
[edit] Licensing
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1923. See this page for further explanation.
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This image might not be in the public domain outside of the United States (this especially applies in Canada, China (not Hong Kong, Macao, or Taiwan Area), Germany, Mexico, and Switzerland). The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details. |
File history
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| Date/Time | Dimensions | User | Comment | |
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| current | 10:35, 12 January 2008 | 672×540 (87 KB) | Chetvorno | ({{Information |Description=Photo of a Dictaphone cylinder dictation machine, made by Columbia Phonograph Co. in the 1920s |Source=Downloaded 2008-1-12 from [http://books.google.com/books?id=KeQPAAAAYAAJ&pg=PA123 Clarence Charles Smith (1922) ''The Expert ) |
