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One of the massive mine explosions at Messines Ridge. 7 June 1917.

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A four-horn acoustic locator, in England, 1930s. There are three operators, two with stethoscopes linked to pairs of horns for stereo listening.

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Workmen fit a set of paraboloids in a sound detector for use by anti-aircraft batteries guarding the skies England, in a factory somewhere in England, on July 30, 1940.

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The Voder as demonstrated by Mrs Harper at The Franklin Institute, c. 1939. The Voder (Voice Operation DEmonstratoR) was Bell Telephone Laboratory's first attempt to electronically synthesize human speech.

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Antiaircraft sound locator apparatus with searchlight and transport, 1932 [Coast Artillery Corps, USA]

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Soldiers operating an acoustic airplane locator during World War II, Trelleborg, Sweden, 1940. (Photo Carl Gunnar Rosborn]

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Pigeons Bred with Camouflage, 1941 Camouflaged pigeons, with a mottled plumage to make them almost invisible to the enemy, were bred in Ontario, during WWII, by Ray R. Delhauer, a retired officer. Believing that pigeons were too vulnerable because bright patches of white or colored feathers made them an easy target, Delhauer bred and crossbred his birds until he achieved a strain with mottled gray and dusty white feathers on their under-bodies as well as on their wings and backs. (Popular Science, Jan, 194, p. 81)

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U.S. Naval Air Station, Santa Ana, California, c. June 1945. pecialist (X) 2nd Class Marcelle Whiteman holds one of the 200 carrier pigeons based at NAS Santa Ana, circa June 1945. The birds were used to transmit communications from the air to the station when radio silence is in force. One of the occupations covered by the Specialist (X) rating was Pigeon Trainer. [Official U.S. Navy Photograph, now in the collections of the National Archives]

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Helen Soros works the new pneumatic tube system to take cash at Marshall Fields store in Chicago, November 26, 1947.

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N.Y. Post Office Pneumatic Tube, c. 1912. The first pneumatic tube mail system was installed in New York City in 1897. Each tube could carry between 400 and 600…

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