The photophone (later given the alternate name radiophone) is a telecommunications device which allowed for the transmission of speech on a beam of light. It was invented jointly by Alexander Graham Bell and his assistant Charles Sumner Tainter on February 19, 1880, at Bell`s laboratory at 1325 L Street in Washington, D.C. Both were later to beco....
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http://en.wikipedia.org/wiki/Photophone
• (n.) An apparatus for the production of sound by the action of rays of light.
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http://thinkexist.com/dictionary/meaning/photophone/
(from the article `motion picture, history of the`) ...of America (RCA), which had tried to market a sound-on-film system that had been developed in the laboratories of its parent company, General ...
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http://www.britannica.com/eb/a-z/p/61
Pho'to·phone noun [
Photo- + Greek ... sound.]
(Physics) An apparatus for the production of sound by the action of rays of light.
A. G. Bell. Found on
http://www.encyclo.co.uk/webster/P/77
The photophone was an instrument invented by Graham Bell and Sumner Tainter, by which sounds, including speech, could be transmitted to a distance by the agency of light. A powerful beam of light was made to fall on a very thin glass mirror, which formed a diaphragm in a bell-shaped receiver. The light was reflected from the mirror through a lens, ...
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http://www.probertencyclopaedia.com/browse/GP.HTM
photophone An instrument for producing sound by the action of light waves.
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http://www.wordinfo.info/words/index/info/view_unit/2737/16
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