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Flash spotting[1] was a military method of detecting the position of enemy guns at long range where the gun could not be observed directly, and was developed during World War I. The flashes could be observed at night as reflections from the sky. The purpose was then to call up friendly guns to destroy the enemy guns' position. Theoretically this could be achieved by several observers spotting the flash from a particular gun and then plotting the intersection of the bearings.
This was extremely difficult with multiple guns firing since several observers could not be sure they were all looking at the same gun. The British solved this using a flashboard located at HQ fitted with a combination of buzzers and signal lights connected to the observers by telephone wires. Using this system, after a sequence of observations, all observers could be sure they were looking at the same gun flashing and its position determined by triangulation.
^Artillery Survey in the First World War. Field Survey Association, 1971, Sir Lawrence Bragg, Major General A. H. Dowson, Lt Colonel H. H. Hemmings
Flashspotting was a military method of detecting the position of enemy guns at long range where the gun could not be observed directly, and was developed...
location of enemy artillery using the "sound and flash" technique (sound ranging and flashspotting). On 17 December 1944, members of Battery B, 285th...
and flashspotting. A sound ranger used aural and stop-watch methods which first emerged before World War I. Stop-watch methods involved spotting a gun...
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provided counter-battery support with their flashspotting groups and sound ranging sections. Using flashspotting, sound ranging and aerial reconnaissance...
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communications and fire plans were developed Artillery sound ranging and flashspotting, for the location and eventual destruction of enemy batteries Factors...
Flashspotting developed in parallel in the British, French and German armies. The combination of sound ranging (i.e., acoustic MASINT) and flash ranging...
British artillery on fleeting targets, reporting during the night by flashspotting. Air reconnaissance during the day found little movement on the roads...
Group bombarded German gun positions revealed by aerial photographs, flashspotting and sound ranging, neutralization being more effective than destruction...
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AOP Squadron was allocated to 3 and 8 AGRAs. 10th Survey Rgt provided flash-spotting and sound-ranging troops to identify enemy batteries, and 8 AGRA was...
McNaughton's innovations in the detection of German artillery positions with flash-spotting and sound-ranging led to the Canadians accurately mapping the vast majority...