A photograph showing a technician from the Bureau of Mines measuring the percussion force of confined military explosives using the lead block test. This test was conducted as part of the Bureau's war work during World War I. The purpose was to ensure accuracy and safety when handling and detonating these explosives.

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

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