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Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Testing for gas with a safety lamp; if there is gas, the lamp will burn with a blue flame. The screening keeps the open flame confined but lets the gas in
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Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Testing for gas with a safety lamp; if there is gas, the lamp will burn with a blue flame. The screening keeps the open flame confined but lets the gas in

Collier, John, Jr, Collier, John · 1942 · photo, print, drawing

From the collection of Library of Congress. Free to download, adapt and use — no permission needed.

Subjects
allegheny countypittsburghpennsylvaniaunited statessafety film negatives
Credit linePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Testing for gas with a safety lamp; if there is gas, the lamp will burn with a blue flame. The screening keeps t. 1942. Collier, John, Jr, Collier, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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