On June 3, 1880, just four years after he patented the telephone, Alexander Graham Bell was talking wirelessly, sending his words over 213 meters on a mirror and a sunbeam on top of the Franklin School in Washington, DC. Bell called it his most important invention and named it the “photophone.”
Just like a telephone, you’d speak into a transmitter and it would be heard via a receiver, except, rather than sending electrical signals over wire, the transmitter focused light onto a parabolic mirror. When you spoke, the mirror vibrated in response, which modulated the sunbeam and varied the intensity of the light reaching the receiver, where, by shining on light-sensitive selenium, the light became speech again. Continue reading “Alexander Graham Bell Made a Wireless Phone That Ran on Sunshine”

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