The photophone is a telecommunications device that allows 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 NW in Washington, D.C. Both were later to become full associates in the Volta Laboratory Association, created and financed by Bell.
The photophone is a telecommunications device that allows 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 NW in Washington, D.C. Both were later to become full associates in the Volta Laboratory Association, created and financed by Bell.
Source: Wikipedia "Photophone" · CC BY-SA 4.0
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