File:SIL14-51634-0776.jpg
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Summary[edit]
| Description |
English: "63,383. Telephonograph after Poulsen, for permanently fixing and conveniently repeating a telephonic conversation, Figure (cf. E. T. Z., 1901, p. 57, 181; Drudes Annalen d. Physik, 3, 1900, p. 754), with a microphone for transmitting, two telephones for receiving, and the necessary cells, also two steel discs and a demagnetizing device.
The fluctuations in a current produced by a microphone are carried through a magnetizing coil, which is guided over a hardened steel plate in a spiral line, in a similar manner as employed in gramophones. The fluctuations in magnetization of the steel plate, which are permanently recorded, suffice to induce currents in the coil of the magnet when the latter is again guided over the steel plate. These currents provide, in the telephone, an accurate and surprisingly clear reproduction - which can be repeated at will - of the sounds originally conducted into the microphone." Max Kohl A.G. : Physical Apparatus. Price List No. 50, Vols. II and III. Chemnitz, n.d. 1911, p. 1057. |
| Date | |
| Source | https://www.sil.si.edu/DigitalCollections/trade-literature/scientific-instruments/files/51634/ |
| Author | Max Kohl A.G. Chemnitz |
Licensing[edit]
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| current | 16:51, 8 December 2023 | | 1,000 × 1,415 (498 KB) | Cosmia Nebula (talk | contribs) | Uploaded a work by Max Kohl A.G. Chemnitz from https://www.sil.si.edu/DigitalCollections/trade-literature/scientific-instruments/files/51634/ with UploadWizard |
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