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Summary
| Description |
English: In October, 1873, Bell began experiments at 292 Essex Street in Boston using vibrating reeds (R) set in motion by speaking into the mouthpiece or orifice (O). A platinum wire (P) attached to the reed (R) dipped into a cup of liquid -- in this case, mercury (M). the round mouthpiece that Bell spoke into was made of gutta percha (gg). The drawing is in the Library of Congress. |
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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, 1931. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:28, 22 November 2014 | | 300 × 300 (10 KB) | Heritager | User created page with UploadWizard |
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