Description | Rough draft of a broadcast talk for the British Broadcasting Corporation (BBC) explaining how light can be used to transmit sounds. Alexander Oliver Rankine compares his photophone to Alexander Graham Bell's system and explains their origins. He explains the physics behind the photo-telephone by relating it to a speech by Dr. Fournier d'Albe about the optophone which he believes that audience may have heard. Rankine ends by explaining the uses of his invention, as a communication system between ships or between hilltops, or as a substitute for the microphone |