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1949 - silent engine-generator set in its sound-muffling box


CD 1963038 E&MP 21.026

Electric Generators

June 9, 1949

A new "silent" engine-generator set, scheduled for service tests in the near future, is shown here in its sound-muffling box.

The glass-wool lining and labyrinthed air ducts reduce the noise of the set in operation by 25 decibels.

Virtually inaudible at a range of 200-325 feet under quiet atmospheric conditions, the machine was developed by the Corps of Engineers Research and Development Laboratories, Fort Belvoir, Virginia.

Original Caption by Science Service
United States Army

National Museum of American History


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