Amplifiers at Bolling Field, 1921.
Two giant horns with ear tubes, evidently designed to listen for approaching aircraft.
Acoustic location was used from mid-World War I to the early years of World War II for the passive detection of aircraft by picking up the noise of the engines. It was rendered obsolete before and during World War II by the introduction of radar, which was far more effective.
Many examples of acoustic location mirrors can still be found on the seacoast of Britain to this day (acoustic mirrors).
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The height-locating half of the Czech four-horn acoustic locator, 1920s
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