Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 54
fromthe left do\vnward, while in 53 the corresponding bundle proceedsfrom the left upward. The telescope shown in figure 52 was an in-verting telescope. In 53 an erecting telescope has been secured bythe use of the negative eye lens. A telescopic system of the elementary type shown in figures 52and… … Galilean telescopic system. described, is replaced by a lens system, in which case the distancefrom the second principal point of the first system to the first prin-cipal point of the second system is made equal to the sum of theec[uivalent focal lengths of the two systems. The inverting…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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