alexander graham bell invented the photophone on february 19, 1880.
alexander graham bell invented the photophone on february 19, 1880.
when did alexander graham bell invented the photophone?
february 19 , 1880
photophone









































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 in washington, d.c. both were later to become full associates in the volta laboratory association, created and financed by bell.









































on june 3, 1880, bell's assistant transmitted a wireless voice telephone message from the roof of the franklin school to the window of bell's laboratory, some 213 meters (about 700 ft.) away.
photophone
bullet::::- "alexander graham bell boulevard", in lehigh acres, lee county, florida;









































bullet::::- "alexander graham bell drive", in columbia, maryland, and in reston, virginia.









































section::::alexander graham bell in popular culture.









































section::::alexander graham bell in popular culture.:in fiction.









































bullet::::- eric walters' "the hydrofoil mystery" (1999) sets a novel in alexander graham bell's workshops, casting the hydrofoil as a new weapon of war being readied for use against german u-boats during the first world war.









































section::::alexander graham bell in popular culture.:in music.
alexander graham bell honors and tributes