File:East Coast Chain Home radar station CH15176.jpg
Original file (1,300 × 963 pixels, file size: 307 KB, MIME type: image/jpeg)
Summary
| Artist |
Royal Air Force official photographer |
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| Description |
English: Royal Air Force Radar, 1939-1945 Chain Home: CH receiver room at an East Coast station, showing one of the two RF7 Receivers (left) and the Mark 3 Console (right) in use. This is typical of late-war CH stations, which had been semi-automated through the use of an analog computer referred to as the "fruit machine". On the left, the radar operator's hand is resting on the goniometer control, which allowed her to change the sensitive direction of the receiver in order to determine the bearing of the target. An additional control set an electronic pointer on the display, the "strobe", to lie over a selected target. When both the direction and range were selected, a button was pushed to send this information electrically to the fruit machine. The fruit machine then applied a number of calculations to these measures to correct for known oddities of the receiver system and geography of the local site, then translated these corrected range and direction measures into map grid references using basic trigonometry. Operators on the right would use this information to develop "tracks" for various targets, updating them on the board hanging from the right wall (only the back can be seen here). Telephones were used to send this information to the various control stations in the reporting chain. |
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| Date | between 1939 and 1945 | |||
| Source/Photographer |
http://media.iwm.org.uk/iwm/mediaLib//39/media-39666/large.jpg
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| Permission (Reusing this file) |
This image was created and released by the Imperial War Museum on the IWM Non Commercial Licence. Photographs taken, or artworks created, by a member of the forces during their active service duties are covered by Crown Copyright provisions. Faithful reproductions may be reused under that licence, which is considered expired 50 years after their creation. | |||
| Part of | Air Ministry Second World War Official Collection | |||
| Subject(s) |
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| Category | photographs | |||
| Image sorted | yes |
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Licensing
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This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag.  |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:47, 21 February 2025 | | 1,300 × 963 (307 KB) | Ich | larger |
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