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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 (LOC)

  • Uploaded by: The Library of Congress
  • License: No known copyright restrictions
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  • 42 favorites
  • 15,542 views
  • Date taken: 1942
  • Date uploaded: 2025-01-16
  • Tags: libraryofcongress, dc:identifier=httphdllocgovlocpnpfsa8d09517
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