photophone

photophone读音音标

英 [\'fəʊtəfəʊn]

美 [\'foʊtoʊfoʊn]

photophone意思解释

n.

光电话，光线电话；

英英释义

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.