File:1932 sound locator.jpg

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Original file ‎(1,613 × 1,076 pixels, file size: 160 KB, MIME type: image/jpeg)

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Description
English: 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.
Date
Source (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.
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Public domain
This file 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, it is in the public domain in the United States.

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  • 2011-01-12 23:59 Brian in denver 1613×1076× (163626 bytes) {{Information |Description = 1932 sound locator and searchlight |Source = Coast Artillery Corps Photo 98175 |Date = 1932 |Author = Coast Artillery Corps |Permission = |other_versions = }}

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current02:06, 25 January 2012Thumbnail for version as of 02:06, 25 January 20121,613 × 1,076 (160 KB)File Upload Bot (Magnus Manske) (talk | contribs) {{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{en|1932 sound locator and searchlight}} |Source=Transferred from [http://en.wikipedia.org en.wikipedia]; t

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