| 摘要 |
A tri-power periscope head assembly utilizing three modular optical assemblies comprised of a highly corrected Petzval type objective lens and first and second Galilean telescope assemblies, each of which is adapted to be simply and readily reversible. In one preferred embodiment, the Galilean telescope assemblies have respective powers of 1.4X and 2X. Manually operable reversing means are provided to alter overall visual system magnification at discrete values of 1.5X, 6X and 12X respectively.
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