Bell and his assistant Charles Sumner Tainter jointly invented a wireless telephone, named a photophone, which allowed for the transmission of both sounds and normal human conversations on a beam of light. Both men later became full associates in the Volta Laboratory Association.
Bell and his assistant Charles Sumner Tainter jointly invented a wireless telephone , named a photophone , which allowed for the transmission of both sounds and normal human conversations on a beam of light . Both men later became full associates in the Volta Laboratory Association .
In the photophone, light carried sound and what?
In the photophone , light carried sound and what ?
normal human conversations
normal human conversations