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Figures (1)

Fig. 1
Fig. 1

Diagrammatic view of four-mode periscopic telescope: (1) periscopic mirror, (2) high power objective, (3) first mode selector, (4) low light level image plane, (5) daylight image plane with field lens, (6), (7), derotation prisms, (8), (9) relay systems, (10) second mode selector, (11) final image plane with reticle, (12) eyepiece, (13) reflector, (14) low power objective, (15) first image plane of low power system with field lens, (16) relay system.