Aiming-Disc
A Dictionary of Military Terms · 1918 · p. 1
A device for ascertaining the accuracy 1 recruit's aim and the trigger turning aim. It is his a power small to rod,pre bearing a disc withoi of me cardboard, painted white, about 1% inches in diametei the front is a black bull's-eye, % inch center of which is pierced a small hole. in On diameter,, the bad bull's-eye, also … inch' in diameter, placed so that t o'clock line is just above the hole which is in the cei the bull's-eye on the front.
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