'Bell came up with the photophone, a device that transmits sound via this'
(A beam of) Light
ALEXANDER GRAHAM BELL: Bell came up with the photophone, a device that transmits sound via this
Bell came up with the photophone, a device that transmits sound via this
Bell came up with the photophone, a device that transmits sound via this
ALEXANDER GRAHAM BELL
A beam of Light
ALEXANDER GRAHAM BELL