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ca. 1939 - PHOTO ELECTRIC CELLS - Phillips Thomas first connects the apparatus with an electric circuit by dialing a certain number.

PHOTOMATIC TELEPHONE EQUIPMENT CLOSE-UP

E&MP 95.017

Photo Electric Cells

ca. 1939

Dr. Phillips Thomas, research engineer of the Westinghouse Electric and Manufacturing Company, first connects the apparatus with an electric circuit by dialing a certain number.

Then by putting a voice impulse into the standard telephone transmitter he causes the camera shutter, just below the light, to open.

This permits a light beam to shoot through the lens in the lower end of the device.

When the light beam strikes a light-sensitive tube across the room, house lights are extinguished, a fan may be turned on or off and other activities originated.

PHOTO ## 198241

Original Caption by Science Service
© Westinghouse



National Museum of American History

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