Attachment 29363
For clarification, the attached extract from the Britishicon War Office 'Weapon Training Memorandum' WAR No.1 dated March 1940 is instructive.
The fixed line sight should not be confused with a dial sight (as on the Vickers gun), which has azimuth graduations together with range and angle of sight setting knobs. These can be used for setting up the gun for indirect fire, setting up a battery of guns to fire on parallel lines etc.
There are no graduations on the FLS. Basically the technique is to set up the gun on its tripod, aimed on the target using the iron sights. The FLS is sighted on an aiming lamp near to the gun. If the gun is removed from the tripod and used for other purposes it can be returned to the same point of aim by replacing it on the tripod, refitting the FLS and adjusting aim by sighting on the aiming lamp again. Provided of course that the FLS settings have not been altered and the tripod and aiming lamp are in the same position!
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