Nokia Bell Labs (formerly Alcatel-Lucent/Bell Labs)
Two drawings indicating the apparatus used in the photophone. Two vertical photos depict how speech travels. One is a man sitting in a chair blowing into an object so the sound goes to the other end of the table. The other depicts two men; one with ear phones and the other speaking into a big round object. Alexander Graham Bell's photophone modulated reflected sunlight with sound vibrations, then detected the sound by using the light to illuminate a piece of selenium. It carried voices without wires, but not very far.