Public domain
Conservation. Glass gauges replacing steel. A steel plug gauge, since replaced by a glass gauge at the Frankford Arsenal, is shown checking an inside diameter of a cartridge case. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by ro
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Credit lineConservation. Glass gauges replacing steel. A steel plug gauge, since replaced by a glass gauge at the Frankford Arsenal, is shown checking an inside diameter of a cartridge case. Glass gauges are lig. 1943-01-01. Hollem, Howard R., United States. Office Of War Information. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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