File:T3 sound locator.jpg
T3_sound_locator.jpg (741 × 529 pixels, file size: 84 KB, MIME type: image/jpeg)
Captions
Summary edit
DescriptionT3 sound locator.jpg |
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 edit
Public domainPublic domainfalsefalse |
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 edit
Date/Time | Dimensions | User | Comment |
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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 = }} |
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:20, 7 October 2023 | 741 × 529 (84 KB) | Dicklyon (talk | contribs) | levels adjusted for clarity | |
21:18, 30 June 2016 | 741 × 529 (34 KB) | FastilyClone (talk | contribs) | Transferred from en.wikipedia (MTC!) |
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Metadata
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Width | 741 px |
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Height | 529 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 96 dpi |
Vertical resolution | 96 dpi |
Software used | Adobe Photoshop 23.5 (Macintosh) |
File change date and time | 11:19, 7 October 2023 |
Exif version | 2.31 |
Color space | Uncalibrated |
Unique ID of original document | 314A13B8D79B4BB1D54C08E3A022990C |
Date and time of digitizing | 04:14, 7 October 2023 |
Date metadata was last modified | 04:19, 7 October 2023 |