Public domain
Conservation. Glass gauges replacing steel. A steel plug gauge is compared with a glass plug gauge which replaces it at the Frankford Arsenal. A plain ring glass gauge shows in the foreground. Glass gauges are lighter and cheaper than steel, permit greatly visibility in inspection, are not as much a
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Credit lineConservation. Glass gauges replacing steel. A steel plug gauge is compared with a glass plug gauge which replaces it at the Frankford Arsenal. A plain ring glass gauge shows in the foreground. Glass g. 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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