Public domain
Conservation. Glass gauges replacing steel. Colonel H.B. Hambleton, Chief of Army Ordnance's Gage Section explains the virtues of a glass plug gauge to Mr. Thornton Lewis and Brigadier General H.F. Safford (left to right). Glass gauges are lighter and cheaper than steel, permit greater visibility i
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Credit lineConservation. Glass gauges replacing steel. Colonel H.B. Hambleton, Chief of Army Ordnance's Gage Section explains the virtues of a glass plug gauge to Mr. Thornton Lewis and Brigadier General H.F. Sa. 1943-01-01. United States. Office Of War Information, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.