Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 109
s of the range finder when adjustmentis to be accomplished. At L there is a small electric lamp, the raysfrom which are rendered parallel by the collimator objective at A.This portion of the system is so located that haK the rays from thecollimator are intercepted by the small penta prism at B and… … Fig. 95.—Method of internal adjustment. penta prism at C and the half of the beam finally enters the largepenta prism to the left. On looking into the eyepiece one sees animage of the light at L in both fields. The range scale is set atinfinity and coincidence secured. If now both prisms B and C…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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