File:Bell's tuning fork sounder, 1872.jpg
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| Description |
English: Bell's first experiments for improving telegraphy involved a replication and improvement upon on Helmholtz's electrical transmission of musical tones from one vibrating tuning fork to another. |
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| Source | Library of Congress | ||||||||||||||||||||
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:28, 22 November 2014 | | 300 × 308 (14 KB) | Heritager (talk | contribs) | User created page with UploadWizard |
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