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Tests cold effects on airplanes. Donald Brooks, Automotive Engineer of the Bureau of Standards, examining the valves of the apparatus known as the humidifier, which enables Bureau experts to test the effect of cold upon airplanes

Tests cold effects on airplanes. Donald Brooks, Automotive Engineer of...

Public domain photograph of people in office, interior, the 1910s-1920s America, free to use, no copyright restrictions image - Picryl description

Tests cold effects on airplanes. Donald Brooks, Automotive Engineer of the Bureau of Standards, examining the valves of the apparatus known as the humidifier, which enables Bureau experts to test the effect of cold upon airplanes

Tests cold effects on airplanes. Donald Brooks, Automotive Engineer of...

A black and white photo of a man working in a factory, Library of Congress Harris and Ewing collection Title from unverified caption data on negative or negative sleeve. On sleeve: Watch Your Credit Line. Gift... More