A operator uses an instrument to detect the sound of sawing timber in a mine. This image was taken during the war work conducted by the Bureau of Mines. The bureau offered the use of their experimental mine near Pittsburgh, along with trained personnel, to further develop instruments for detecting enemy mining operations and standardize the strength of different mining sounds.

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Size: 8448px × 5862px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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