Army & Navy And Civilian Defense, Mar. 16, 1942

ALARM FOR MANHATTAN

This Rube-Goldbergian contraption is a product of the National Defense Research Committee, which includes the best scientific brains in the country. Powered by a 95-h.p. engine, the siren shoots a blast of air through spinning blades, creating sufficient racket to alarm a good-sized town. Tried in Manhattan, it whined over the downtown district, was reflected back over Brooklyn from Manhattan's tall buildings.

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