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Conservation. Glass gauges replacing steel. Checking an inside diameter of a cartridge case with one of the glass gauges, which replace steel gauges at the Frankford Arsenal, are produced by acid etching. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are n
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Credit lineConservation. Glass gauges replacing steel. Checking an inside diameter of a cartridge case with one of the glass gauges, which replace steel gauges at the Frankford Arsenal, are produced by acid etch. 1943-01-01. United States. Office Of War Information, Hollem, Howard R.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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