![Schematic of a working Photophone as described in 1880 [16, 21] | Download Scientific Diagram](https://www.researchgate.net/publication/348994890/figure/fig3/AS:987065881731076@1612346253592/Schematic-of-a-working-Photophone-as-described-in-1880-16-21.jpg "Schematic of a working Photophone as described in 1880 [16, 21] | Download Scientific Diagram")
Schematic of a working Photophone as described in 1880 [16, 21] | Download Scientific Diagram
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Alexander Graham Bell's photo phone. vibrations of the diaphragm of the transmitter caused light pulses to fall on a light sensitive selenium cell. Dated 1891 Stock Photo - Alamy
RCA Photophone was the trade name given to one of four major competing technologies that emerged in the A… | Cinema projectionist, Movie projector, Cinema projector
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:max_bytes(150000):strip_icc()/GettyImages-89861170-56b008335f9b58b7d01f9b15.jpg "Alexander Graham Bell and the Photophone")
Alexander Graham Bell and the Photophone
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The photophone by Alexander Graham Bell, device that allows transmission of speech on a beam of..., Stock Photo, Picture And Rights Managed Image. Pic. DAE-BA051830 | agefotostock
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Schematized representation of Graham Bell's photophone [5] | Download Scientific Diagram
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_-_(MeisterDrucke-966632).jpg "The Talking Photophone, de Graham Bell e Summer Tainter (gravura)")