| 摘要 |
A periscopic sight is mounted to extend through the wall of protective armor surrounding a gun station. An elevation mirror is exposed to receive light from the direction in which the gun is pointing and to reflect the light along a vertical path extending through the sight. A sealed unitary lens system has a lens axis aligned with the vertical path and conducts the light therethrough to a stationary mirror accessible to the eye of an observer. The sealed unitary lens system has a sufficiently long eye relief to provide an unobstructed image to the observer in spite of the placement of the stationary mirror between the lens system and the observer.
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