Image: 1932 sound locator

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Description: US Army aircraft sound locator apparatus and searchlight, 1932. Before radar was developed in World War 2, acoustic horns like this were used to detect the sound of approaching enemy aircraft at a distance. Stereo horns, one attached to each ear, allowed the observer to judge the direction of the aircraft. The horns were used in pairs; the horizontal pair to determine direction and the vertical pair to determine elevation.
Title: 1932 sound locator
Credit: (Original text: Coast Artillery Corps Photo 98175) Original uploader was Brian in denver at en.wikipedia (12 January 2011 (original upload date))
Author: Coast Artillery Corps.
Permission: This image is a work of a U.S. Army soldier or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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