File:Detail showing Bell's liquid transmitter in a drawing by P.D. Richards of the experiments in early 1873.jpg
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English: P.D. Richards, Bell's friend and neighbor, wrote the inventor a letter on November 9, 1874 describing the transmission of telegraphic messages over wires using a liquid transmitter filled with mercury. This is a detail of the drawing included with the 1874 letter, which is in the Library of Congress |
| Date | |
| Source | Library of Congress |
| Author | Alexander Graham Bell |
35 West Newton Street, Boston, MA
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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 | | 359 × 300 (17 KB) | Heritager (talk | contribs) | User created page with UploadWizard |
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