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A submarine commander in tactical conditions must exercise discretion when using his periscope, since it creates a visible wake (and may also become detectable by radar), [11] [12] giving away the submarine's position. Marie-Davey built a simple, fixed naval periscope using mirrors in 1854.
The periscope on the left uses mirrors at locations labled "a" whereas the right uses prisms at "b" locations. The observer is "c". Italiano: Principio del periscopio.
American soldiers using a coincidence rangefinder with its distinctive single eyepiece during army maneuvers in the 1940s. A coincidence rangefinder or coincidence telemeter is a type of rangefinder that uses the principle of triangulation and an optical device to allow an operator to determine the distance to a visible object.
Celestial navigation using the periscope, or sextant—seldom used anymore due to advancement in technology; Radar navigation; radar signals are easily detected so radar is normally only used in friendly waters entering and exiting ports. With the implementation of a more advanced radar system, many new techniques have been implemented in this ...
An arrest was made after a 9-year-old Illinois boy was shot and killed in Wisconsin. Officers were called to a home in Lake Geneva, Wis., on a report of a shooting at around 2:25 a.m. on Monday ...
Social Security has two other funding sources: benefit taxes on some seniors and interest income earned on money in the program's trust funds. But both of those are in danger right now. The ...
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A toy kaleidoscope. A kaleidoscope (/ k ə ˈ l aɪ d ə s k oʊ p /) is an optical instrument with two or more reflecting surfaces (or mirrors) tilted to each other at an angle, so that one or more (parts of) objects on one end of these mirrors are shown as a symmetrical pattern when viewed from the other end, due to repeated reflection.