चित्र:Dictaphone cylinder machine.jpg
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Dictaphone_cylinder_machine.jpg ((६७२ × ५४० पिक्सेल, फ़ाइल का आकार: ८७ KB, MIME प्रकार: image/jpeg))
सारांश
| विवरण |
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. |
| दिनांक | |
| स्रोत | 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. |
| लेखक | Columbia Phonograph Co. |
| अनुमति (इस चित्र का पुनः उपयोग करना) |
Public domain - published in USA before 1923. |
लाइसेंस
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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, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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| दिनांक/समय | अंगूठाकार प्रारूप | आकार | प्रयोक्ता | प्रतिक्रिया | |
|---|---|---|---|---|---|
| वर्तमान | १०:३५, १२ जनवरी २००८ | | ६७२ × ५४० (८७ KB) | wikimediacommons>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 |
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