Watchf AP A  DC USA APHS407106 Electricity

Electricity

Mrs. Lucille Streets, junior physicist at the U.S. Bureau of standards in Washington on April 15, 1940, holds a four-inch integrating sphere used to measure the light output of tiny flashlight lamps. Beside her is the 15-foot sphere in which larger light sources are tested. The larger sphere has a movable half, which swings on hinges. The fixed hemisphere may be used as a hemispherical. (AP Photo/Harvey Georges)

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4004150175
April 15, 1940 12:00:00 AM
September 23, 2011 07:43:35 PM
Harvey Georges
AP
ASSOCIATED PRESS
26096
2332 x 3000 3.86 MB
Standing Holding Watching Circle
Washington, DIST. OF COLUMBIA, United States
APHS407106
STF
IP AB2

This content is intended for editorial use only. For other uses, additional clearances may be required.

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