Alan Leighton of the Bureau of Mines is shown in this photo conducting war work related to detecting enemy mining operations. The Bureau is developing instruments, with guidance from the French, to detect and measure the sound of mining activities. Here, Leighton is using a French microphone to listen for these sounds through clay. This photo was taken on November 14, 1918.

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Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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