潛望鏡示意圖 Principle of the periscope. A - Periscope using two plane mirrors. B - Periscope using two right–angled prisms. 1 - 2 - Plane mirrors. 3 - 4 - Right–angled prisms. 5 - 6 - Observer eye. 7 - 8 - Periscope tube. H - Periscope optical height.
Principle of the lens periscope.A - Periscope using a single lens (L2) to correct image.B - Periscope which uses two lenses (L2-L3) to correct image.1-3 - Periscope window.2-4 - Field stop or reticle.P - Right–angled prisms (or plane mirrors).L1 - Objective lens.L2 - for A - L2 - L3 - for B - Image erecting lens.L3 - L4 -for A - L4-L5- for B - Eyepiece.L0 - Field lens.y - Distant object.H - Periscope optical height.
Officer at periscope in control room of a U.S. Navy submarine in World War II. The officer pictured is Captain Raymond W. Alexander, Sr. and the photo was taken in 1942.
Submarine monocular attack periscope
Torpedoed Japanese destroyer Yamakaze photographed through periscope of USS Nautilus( USS Nautilus (SS-168)), 25 June 1942.