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
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.