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noun

Periscope n.

A general or comprehensive view. (archaic)

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.

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Etymology of 'Periscope'

Collaborative International Dictionary of English 0.48

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"Periscope" Quotes from Famous Books

... a submarine and Blinks acted the part of a first-class battleship. Jinks would pop his periscope out of the water, take a look at Blinks merely for the fraction of a second, and then, like a flash, would dive under water again and start firing his torpedoes. He ...

— Moonbeams From the Larger Lunacy • Stephen Leacock

... viewing glass of a periscope arrangement that let no betraying light escape to the outside, they watched the endless lines of illuminating globes slip by beneath them. Weirdly vast and shadowy in the upper reaches, the latticed supporting columns on either side merged into continuous semi-transparent ...

— The Copper-Clad World • Harl Vincent

... and owing to the difficulty of observation it is at times somewhat blind. This difficulty has in a measure been decreased, however, by the use of the hyperscope, an instrument which works very much like the periscope on a submarine. It permits an observer to look out over the top of a parapet without raising his head above ...

— The New York Times Current History of the European War, Vol 1, Issue 4, January 23, 1915 • Various

Words linked to "Periscope" : submarine, optical instrument, pigboat, U-boat