periscopic$525370$ - ορισμός. Τι είναι το periscopic$525370$
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Τι (ποιος) είναι periscopic$525370$ - ορισμός

INSTRUMENT FOR OBSERVATION FROM A CONCEALED POSITION
Demo periscope; Periscopes; Vision block; Submarine periscope; M28 periscopic sight; Periscope depth
  • 1889 Arthur Krebs & Jean Rey periscope for the french Gymnote submarine

periscope         
(periscopes)
A periscope is a vertical tube which people inside submarines can look through to see above the surface of the water.
N-COUNT
Periscope         
·noun A general or comprehensive view.
II. Periscope ·noun an optical instrument of tubular shape containing an arrangement of lenses and mirrors (or prisms), allowing a person to observe a field of view otherwise obstructed, as beyond an obstructing object or (as in submarines) above the surface of the water.
periscope         
n.
1) to lower; raise a periscope
2) (as commands) periscope down; periscope up

Βικιπαίδεια

Periscope

A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position.

In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches during World War I. Military personnel also use periscopes in some gun turrets and in armoured vehicles.

More complex periscopes using prisms or advanced fiber optics instead of mirrors and providing magnification operate on submarines and in various fields of science. The overall design of the classical submarine periscope is very simple: two telescopes pointed into each other. If the two telescopes have different individual magnification, the difference between them causes an overall magnification or reduction.