Public domain
Conservation. Glass gauges replacing steel. Glass gauges of various types are replacing steel gauges at the Frankford Arsenal. Left, top to bottom: double-end gauge, "go" plug gauge, ring gauge. Right, top to bottom: "not go" plug gauge, double and solid-handle plug gauge, double-end taper-lock stan
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Credit lineConservation. Glass gauges replacing steel. Glass gauges of various types are replacing steel gauges at the Frankford Arsenal. Left, top to bottom: double-end gauge, "go" plug gauge, ring gauge. Right. 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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