Photophone.jpg (450 × 196 pixels, file size: 21 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:25, 3 June 2008 | 450 × 196 (21 KB) | Морган | {{Information |Description={{en|1=Diagram of the Photophone. From [http://histv2.free.fr/bell/bell5.htm]. The image is taken from Alexander Graham Bell's 1880 paper.}} |Source= http://histv2.free.fr/bell/bell5.htm |Author=Alexander Graham BELL, Ph.D., |D |
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