Twenty Walls for Better Lights… (Jan, 1948)

Twenty Walls for Better Lights…

This shell is half of an icosahedron—a fancy word for a 20-sided room—used by Westinghouse engineers to test new street-lighting fixtures. When the technician above has adjusted the globe enclosing a bulb, the other half of the odd-shaped room is attached, and multiple walls give an even distribution of light. Brightness is then measured by a photocell mounted in a window at one side. For comparison, a bare bulb is similarly tested in the auxiliary socket at left.

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