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File:T3 sound locator.jpg

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T3_sound_locator.jpg (741 × 529 pixels, file size: 84 KB, MIME type: image/jpeg)

Summary

Description
English: A T3 aircraft sound locator used for air defense by the U.S. Army Signal Corps. Before radar was invented in World War II, passive acoustic aircraft location devices were used by a number of nations to detect incoming enemy aircraft by listening for the sound of their engines. This example consists of two pairs of horn sound collectors on a steerable mount, attached to stethoscope-type earphones worn by observers. The horizontal (right–left) pair was used to determine the azimuth of the aircraft, and the vertical (top–bottom) pair was used to determine its elevation. "AWC" may indicate the photo was taken at the US Army War College, then at w:Fort McNair, Washington D.C. "BOWEN" might refer to Admiral Harold Gardiner Bowen (1883–1965) who at that time was directing air defense research at the Naval Research Laboratory and later had a role in developing w:radar.
Date
Source Auction site says it is an official US Army Signal Corps photo.
Author Signal Corps

Licensing

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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Original upload log

The original description page was here. All following user names refer to en.wikipedia.
Date/Time Dimensions User Comment
2010-07-13 20:01:47 741× 529× Brian in denver {{Information |Description = T3 sound locator |Source = U.S. Army Signal Corps |Date = 1-November 1927 |Author = Signal Corps |Permission = |other_versions = }}

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1 November 1927Gregorian

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Date/TimeThumbnailDimensionsUserComment
current18:20, 7 October 2023Thumbnail for version as of 18:20, 7 October 2023741 × 529 (84 KB)Dicklyonlevels adjusted for clarity
21:18, 30 June 2016Thumbnail for version as of 21:18, 30 June 2016741 × 529 (34 KB)FastilyCloneTransferred from en.wikipedia (MTC!)

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