a website collaboration between Science Service and the Smithsonian Institution

Thomas H. Long adjusts the light sensitive cell known as the electric eye, so that it will turn on an air beacon just before sunset and turn it off just after sunrise

"ELECTRIC EYE"

E&MP 94.017

Photo Electric Cells

no date

Thomas H. Long, engineer of the Westinghouse Electric and Manufacturing Company, adjusts the light sensitive cell known as the "electric eye", so that it will turn on an air beacon just before sunset and turn it off just after sunrise.

A pair of these "eyes" are to be put in trial installations near Pittsburgh so that the operation of the beacons will be controlled by degree of light and darkness, rather than by the flexible clock system which makes no distinction between fair and cloudy days.

PHOTO 198889

Original Caption by Science Service
© Westinghouse Electric



National Museum of American History

Home

Search - Site Map - Subjects to Choose From - Numbering Format

Credits - Copyright - Comments