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German acoustic/optical locator, 1917. A junior officer and an NCO from an unidentified Feldartillerie regiment wearing combined acoustic/optical locating apparatus.
Japanese ‘War Tuba’ in an air field, 1921. After WWI aircraft detection became increasingly important to warfare. Before radars acoustic amplifiers and mirrors with different designs were used…
Acoustic listening device developed for the Dutch army as part of air defense systems research between World Wars I and II.
Helen Soros works the new pneumatic tube system to take cash at Marshall Fields store in Chicago, November 26, 1947.
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…
The War Office Sub-centre despatch room, London, 1925. Pneumatic messaging blows cylinders carriers inside tubes and was developed in London in the 1850’s as a way to handle…
Amelia Earhart em frente ao seu Lockheed L-10 Electra, o avião que pilotava quando desapareceu em Julho de 1937 (foto n.d.) Amelia Earhart [1897-1937 (?)] começou a pilotar…
Construction of the Subway Tunnel under 6th Ave., New York, 1939. Photo: Bob Seelig/New York Daily News
The Beach Pneumatic Subway Tunnel under Broadway, 1873. New-York Historical Society # 70265 In 1869, folowing the use of pneumatic tubes for postal communication, Alfred Ely Beach started…
Woman using the pneumatic tube delivery system at the offices of Kelly Douglas Ltd, 1946 Photo: Jack Lindsay City of Vancouver archives