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periscope

periscope (pĕr´Ĭskōp) [Gr.,=view around], instrument to enable a person to see objects not in his direct line of vision or concealed by some intervening body. Its essential parts are a tube, prisms, lenses, mirrors, and an eyepiece. The image is received in one mirror and reflected through the tube with its lenses to a mirror visible to the viewer. Periscopes used in submarines are so arranged that they can be turned to permit a view of the entire horizon, with built-in rangefinders and typically six times magnification. Submarine periscopes are of noncorrosive metal, have tubes up to 30 ft (9.1 m) long and about 6 in. (15 cm) in diameter (only a small section projects above the water), and may be withdrawn into the submarine. Many smaller types of periscopes are used in trenches and tanks. With the development of fiber optics, periscopes (known as cystoscopes or endoscopes) have become useful in medicine.

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periscope

per·i·scope / ˈperəˌskōp/ • n. an apparatus consisting of a tube attached to a set of mirrors or prisms, by which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight.

periscope

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periscope

periscope Optical instrument consisting of a series of mirrors or prisms that allows a person to view the surroundings from a concealed position by changing the direction of the observer's line of sight. Since World War I, the periscope has been most commonly associated with submarines.

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periscope

periscope XIX. f. PERI- + SCOPE.

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periscope

periscopeaslope, cope, dope, elope, grope, hope, interlope, lope, mope, nope, ope, pope, rope, scope, slope, soap, taupe, tope, trope •myope • telescope • periscope •stereoscope • bioscope • stroboscope •kaleidoscope • CinemaScope •gyroscope • microscope • horoscope •stethoscope • antelope • envelope •zoetrope • skipping-rope • tightrope •towrope • heliotrope • lycanthrope •philanthrope • thaumatrope •misanthrope •isotope, radioisotope

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