File:P.D. Richards drawing of Bell experiments in early 1873.jpg
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Summary
| Description |
English: P.D. Richards, Bell's friend and neighbor, wrote the inventor a letter on November 9, 1874 detailing the experiments he had witnessed in which Bell was sending messages over wires using a liquid transmitter filled with mercury. The caption reads: "Apparatus constructed by A. Graham Bell during the winter of 1872-3. Drawn from memory (Feb. 1876) by P. D. Richards (a witness of the experiments)." |
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| Source | Library of Congress | ||||||||||||||||||||
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Licensing
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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 | | 3,171 × 2,186 (375 KB) | Heritager | User created page with UploadWizard |
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