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The Gun
sights and laying - parallelism


Because neither director nor dial sight was available, making lines of fire parallel was possible only by rough and ready methods.
parallelism diagram 1

parallelism diagram 2

a. Plant aiming post X in No 1 gun's line of fire.
b. Tape distance between 1 and 2 guns.
c. Plant aiming post Y same distance from aiming post X.
d. Lay No 2 gun on aiming post Y.
The remaining guns in the battery were made parallel in the same way.

 
WL Ruffell
Issue 90
June 1996

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