File:Australian Heliograph in Egyptian Desert 1940.png
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DescriptionAustralian Heliograph in Egyptian Desert 1940.png |
English: Two A.I.F. signallers use a heliograph during exercises in the Western Desert of Egypt (Libya) in Nov. 1940, during World War II. This photo was made into a A.I.F. recruiting poster in Sept. 1941. This is an official Department of Information (Australia) photo of two signallers of the 2nd Australian Imperial Force. They are using a Mance Mark V heliograph in duplex (dual-mirror) mode to signal by Morse Code using reflected sunlight modulated by tilting one mirror. This photo appeared in the Australian Sydney Morning Herald on Nov. 13, 1940 ( https://news.google.com/newspapers?id=qLVVAAAAIBAJ&sjid=spYDAAAAIBAJ&dq=department-of-information%20heliograph&pg=7317%2C1448435 ), the West Australian on Nov. 16, 1940 (http://trove.nla.gov.au/ndp/del/article/46749411), and the Examiner (Tasmania) on Nov. 20, 1940 (http://nla.gov.au/nla.news-article52389945) The poster was announced on Sept. 11, 1941, in the Courier-Mail (Brisbane, Queensland, Australia) (http://nla.gov.au/nla.news-article41941629). This was the cover photo for the British publication "The War Illustrated", VOl. 4, No.75, Feb. 7, 1941, with the title: "Signals in The Desert Battle: Australians With A Heliograph". |
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Date | Taken on 13 November 1940 | |||||||||||||||||||||||||
Source | This is an official Australian Department of Information photo taken in Nov. 1940 in Libya. I ordered this particular scan from the State Library of Victoria, http://www.slv.vic.gov.au/argus/gid/slv-pic-aaa30361/1/an014292, with the stated purpose of putting it in Wikimedia to make it publicly viewable and downloadable. Their record for this item says to cite it as Argus Newspaper Collection of photographs, State Library of Victoria, Accession no(s) H99.202/2489, and states that This work is out of copyright , No copyright restrictions apply. | |||||||||||||||||||||||||
Author | Anonymous, official Department of Information (Australia) photo. | |||||||||||||||||||||||||
Permission (Reusing this file) |
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Annotations InfoField | This image is annotated: View the annotations at Commons |
This tripod-mounted pair of mirrors is a Mance Mark V heliograph, a device used to signal by mirror-reflected flashes of sunlight using Morse Code. See "Heliograph" on Wikipedia for more information. For more about the A.I.F., see http://en.wikipedia.org/wiki/Second_Australian_Imperial_Force
This image was obtained from the State Library of Victoria, ( http://www.slv.vic.gov.au/argus/gid/slv-pic-aaa30361/1/an014292[dead link]) and is from the Argus Newspaper Collection of photographs, State Library of Victoria, Accession no(s) H99.202/2489
This is the compartmented leather case used to carry the metal and glass components of the heliograph when disassembled for transport. When the heliograph was in use, the case was usually suspended from the tripod by its canvas shoulder strap, as seen here.
This is a female-threaded metal cap attached to the tripod leg by a chain. It is used to protect the male threads on the top of the tripod when the heliograph is removed from the tripod for transport.
The main mirror is produces flashes of sunlight by means of intermittent tilting of the mirror in elevation by the signaller depressing a disk attached to a four-bar linkage attached to the mirror.
This second, or "duplex" mirror was used when the sun and the target were on opposite sides of the signaler. When the target was on the same side of the signaler as the sun, a sighting rod was mounted in this location instead. The sighting rod had a crosshairs to align the heliograph with the target.
Items portrayed in this file
depicts
13 November 1940
image/png
19e43f3f13b14a96dfffc08f2fe339a3fe482f0b
28,393,645 byte
4,993 pixel
3,534 pixel
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:29, 11 November 2012 | 3,534 × 4,993 (27.08 MB) | wikimediacommons>Heliograph | {{Information |Description ={{en|1=Two A.I.F. signallers use a heliograph during exercises in the Western Desert of Egypt (Libya) in Nov. 1940, during World War II. This photo was made into a A.I.F. recruiting poster in Sept. 1941. This is an offici... |
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Exposure time | 2,694/336,749 sec (0.0080000237565665) |
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Date and time of data generation | 12:04, 2 November 2012 |
Serial number of camera | EH021697 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Light source | Other light source |
Color space | Uncalibrated |
Image width | 3,534 px |
Image height | 4,993 px |
Software used |
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Date and time of digitizing | 12:04, 2 November 2012 |
File change date and time | 22:52, 2 November 2012 |
Date metadata was last modified | 22:52, 2 November 2012 |
Unique ID of original document | xmp.did:74C9A4067424E211840194948BC99CB8 |