Early 20th Century military amplifiers

Early 20th Century military amplifiers

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Caption: Early 20th Century military amplifiers. Historical image of large amplifiers being used to listen for approaching enemy aircraft. Photographed at the US Air Force base in Bolling Field, Washington DC, USA. Published in 1921.

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Keywords: 1921, 20th century, acoustic, acoustics, adult, air force base, airforce, american, amplifier, amplifiers, auditory, black-and-white, bolling field, building, caucasian, early, equipment, historical, history, human, listening, male, man, military, monochrome, north america, people, person, soldier, technological, technology, united states, usa, using, washington dc

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