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periscope Definition

peri·scope (per′ə skōp′)

noun

  1. a periscopic lens
  2. an optical instrument consisting of a tube holding a system of lenses and mirrors or prisms, so arranged that a person looking through the eyepiece at one end can see objects reflected at the other end: used on submerged submarines, etc.

Etymology: peri- + -scope

periscope Usage Examples

Converse of object

  • use: Sir Kenneth's solution was to use a small periscope which could be lowered behind the lens for focussing.
  • have: Just along the road you can get up to the bridge over which you can see the railroad, provided you have a periscope.
  • raise: The lever to lower and raise the periscope can be seen just above the letter ' p ' .
  • make: An additional activity which is fun to do is to make a simple periscope ( see Resource Sheet 5 ).
  • sight: Cressy, under Captain Johnson, had also stopped to lower boats but got underway on sighting a periscope.
  • spot: Whilst doing a starboard sweep with my binoculars I was convinced I spotted a periscope.

Adjective modifier

  • submarine: He also managed to detect submarine periscopes at 4 miles with the same equipment.
  • s: The crew of the Ashigara however sighted Trenchant ' s periscope and opened fire with an antiaircraft gun.
  • small: Sir Kenneth's solution was to use a small periscope which could be lowered behind the lens for focussing.

Modifies a noun

  • depth: Later passed close to 3 more trawlers at periscope depth, sighted armament on one of them.
  • exhaust: The stern was left hanging over, as we still had out periscope exhaust sticking out on the side of the barge.
  • standard: The other shell hit Unison ' s bridge, exploding on the forward periscope standard.
  • wake: The periscope has been lowered - we don't want a target - or its escorts - noticing a tell-tale periscope wake.
  • lens: The actual sight was a graticule, or line down the center of the periscope lens.
  • sight: Wanklyn succeeded in dodging the oncoming destroyer without going deep and, as his periscope sights came on, fired at the largest transport.

Noun used with modifier

  • trench: Trench periscope for observing enemy whilst concealed behind parapet or other fortification.
  • parallax: The unit allows focusing of the specimen and camera image through the parallax focus periscope.
  • night: New innovations were an all-welded hull, radar which could be worked from periscope depth and a night periscope.

Possessives

  • submarine: The submarine's periscope and radar mast are damaged.

Preposition: of

  • submarine: The periscope of the submarine was then seen on our starboard bow, about a foot above the water.