Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 88
he American-made collimators were constructed exactly like theFrench type and others were as shown in figure 80. During the war,only two sights built in this country were of the collimating type, theAmerican-built French seventy-five and the quadrant siglit used on 84 the 37-mm. gun. Figure 81… … Fig. 82.—The correct use of the collimator sight. Both eyes are open and about 10 or 12 inches from the cohimator.One eye sees the cross through the collimator, the other views the target, and sighting is accomplishedby superposing the cross on thetarget. This method is funda-mentally incorrect, as…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
