The Survey Battalions experimented with various techniques of observing concussion waves and flashes in many battles. Four thousand officers and men with only one duty – seeking out the enemy guns. Accounts of the methods of gun location which were used, descriptions of the every day life of a Group or Section, and the personal experiences of the officers and men.
FLASH SPOTTERS AND SOUND RANGERS How they lived, worked and fought in the Great War
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The standard text on development of artillery survey and work on the Western Front: How the Observation Groups & Sound Ranging Sections Came to be Formed; Fulfilled Their Purpose; Survey Posts & Their Equipment; experiences of participants in France & Italy. A very useful & informative work.

