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  • WordNet 3.6
    • n periscope an optical instrument that provides a view of an otherwise obstructed field
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: In 1916, Jones Wister of Philadelphia, Pennsylvania invented a rifle for shooting around corners. It had a curved barrel and periscopic sights.
    • n Periscope A general or comprehensive view.
    • ***
Century Dictionary and Cyclopedia
    • n periscope A general view or comprehensive summary. [Rare.]
    • n periscope An instrument by which objects in a horizontal view may be seen through a vertical tube. It is used in piloting submarine boats, and consists substantially of a vertical tube with a lenticular total-reflection prism at the top, by which horizontal rays are projected downward through the tube, and brought to a focus, after which they are received by a lens the principal focus of which coincides with that point. The vertical cylindrical beam thus formed is converted into a horizontal one again by a mirror inclined at 45° from the vertical axis of the tube, and is thus conveyed to an eyepiece, through which, by turning the tube on its vertical axis with its attached prism, a view of all the supernatant objects around the vessel may be obtained. A screen or diaphragm operated by a tangent-screw is used to cut off the view of the vertical plane in which the sun is.
    • n periscope in photography, a photographic lens having a wide angle (90° or more).
    • ***
Chambers's Twentieth Century Dictionary
    • n Periscope per′i-skōp an instrument like the altiscope, used in directing submarine boats
    • ***


Webster's Revised Unabridged Dictionary
Pref. peri-, + -scope,
Chambers's Twentieth Century Dictionary
Gr. peri, about, skopein, to see.


In literature:

He had never seen a periscope in his life, but he had read about periscopes.
"The U-boat hunters" by James B. Connolly
The phrase "same idea as a periscope" puzzled him.
"Tom Slade on a Transport" by Percy Keese Fitzhugh
Kendall stared into the periscope visor intently.
"The Ultimate Weapon" by John Wood Campbell
How close the fire is here is shown by one of my companies having had two periscopes hit.
"Letters of Lt.-Col. George Brenton Laurie" by George Brenton Laurie
I used only white light through the periscope.
"The Wreck of the Titan" by Morgan Robertson
When the line was "quiet" the men were enabled to examine the enemy's positions with the aid of periscopes.
"The 28th: A Record of War Service in the Australian Imperial Force, 1915-19, Vol. I" by Herbert Brayley Collett
Scarcely had the bow of the sailing vessel been passed ere the submarine was so far beneath the water as to show only the periscope.
"Boy Scouts in the North Sea" by G. Harvey Ralphson
The tinkle of broken glass sliding down the bamboo tube told that the periscope was a wreck.
"Panther Eye" by Roy J. Snell
It was the tall periscope that received the shot, which struck it about four feet from the top.
"The Boy Volunteers with the Submarine Fleet" by Kenneth Ward
Russ leaped from the chair and raced to the periscopic mirror.
"Empire" by Clifford Donald Simak
Jason looked through the second-driver's periscope as the outer gate lifted.
"Deathworld" by Harry Harrison
Ned took his chums by the arms, and led them a little way down the trench where there was an improvised periscope.
"Ned, Bob and Jerry on the Firing Line" by Clarence Young
Looking through the rear range-finding periscope, he saw that they were about twenty miles from the fort.
"The Martian Cabal" by Roman Frederick Starzl
Swiftly he revolved the periscope aerial.
"Loot of the Void" by Edwin K. Sloat
In the treacherous light of early dawn the fins of big porpoises were more than once mistaken for the hunted periscope.
"Submarine Warfare of To-day" by Charles W. Domville-Fife
Has he seen our periscope in the second it was exposed, and is he running away from us?
"The Journal of Submarine Commander von Forstner" by Georg-Günther von Forstner
They lay quietly at last while a periscope of super-sensitiveness was thrust cautiously above the water.
"Astounding Stories of Super-Science January 1931" by Various
General Layton took his eyes away from the periscope.
"Fifty Per Cent Prophet" by Gordon Randall Garrett
The next day they began to see periscopes.
"With the French in France and Salonika" by Richard Harding Davis
We had knocked the stuffings out of a periscope; it stood to reason we'd sunk her.
"Over the Seas for Uncle Sam" by Elaine Sterne

In poetry:

Some scarlet poppies lay upon our right.
He watched them through his periscope all day.
He watched then all the day; but in the night
They seemed to pass away.
"Poppies" by Leon Gellert
Sleep navigates the tides of time;
The dry Sargasso of the tomb
Gives up its dead to such a working sea;
And sleep rolls mute above the beds
Where fishes' food is fed the shades
Who periscope through flowers to the sky.
"When Once The Twilight Locks No Longer" by Dylan Thomas
How long… since their last shell gouged our batteries?
How long… since we rose at aim with a sleuth moon astern?
(It was the damned green moon that nosed us out…
The moon that flushed our periscope till it shone like a silver flame…)
"The Everlasting Return" by Lola Ridge

In news:

A Connecticut technology start-up has patented a multilayer composite polymer coating system that can de-ice aircraft in flight and defoul periscope head windows in service.
Papa Murphy's Account to Periscope .
CHICAGO Independent agency Periscope said it has won the ad account of pizza chain Papa Murphy's after a review.
Periscope Studio is home to more than twenty artists who create comic books, graphic novels and online comics.
After letting your periscope 's body dry overnight, remove the clamps, smear a little glue on the mirror blocks' sides and slip them back in position.
If friction alone doesn't keep them in place, hold them still with a few small clamps across the sides of the periscope .
30pm off the northeast Florida coast when a watch team on board the Aegis cruiser USS San Jacinto saw the periscope of.
In the summer of 2011, resident artists from The Periscope Project loaded the completed unit into another U-Haul and set out on a tour of several aerospace industry sites in the San Diego Area.
Starship Enterprise -inspired command center features multiple screens and an electronic periscope.
" At first, it looked like a car submarine with a periscope, but as it got closer I caught the "Google" logo on the side of the car.
Bugs on the surface the dark outline of a trout at periscope depth.
Minesweeper CONDOR sights periscope off Honolulu Harbour, notifies patrol destroyer WARD to investigate.
A periscope enabled forward vision.
A History of Submarine Periscopes.
The periscope stands at mid-level.

In science:

Suitably applied to a couple of interfering beams, a couple of periscope yields two lightwaves phase shifted by π (opposed field vectors).
Tests of achromatic phase shifters performed on the SYNAPSE test bench: a progress report
We recommend that this focalizing mirror must not be used for beam adjustment on the spectrograph slit, but the periscope mirrors instead.
AMBER Task Force February 2008 run report
This setting must be done using the 2 translation stages of the periscope, one on each mirror that correspond to the 2 directions.
AMBER Task Force February 2008 run report
However, the position of one unique and common polarizer in the periscope tower should be privileged rather than 9 independant polarizers located at the output of the fibers.
AMBER Task Force February 2008 run report
The position of one unique and common polarizer in the periscope tower (upper left) should be privileged.
AMBER Task Force February 2008 run report
To reduce the distance between the 3 LGS beams and to reduce the dimension of the final collimator optics a periscope assembly has been designed (see section 4.5).
Design of the wavefront sensor unit of ARGOS, the LBT laser guide star system
The periscope is composed by two flat mirrors set parallel to each other and inclined by 45◦ with respect the light direction.
Design of the wavefront sensor unit of ARGOS, the LBT laser guide star system
The first periscope mirror is a commercial 12.7mm laser-line flat mirror produced by Newport made by 3.1mm thick Pyrex substrate polished at λ/10 precision.
Design of the wavefront sensor unit of ARGOS, the LBT laser guide star system
The unit is inserted at the center of the 3 WFS arms, between the entrance windows and the periscope assembly.
Design of the wavefront sensor unit of ARGOS, the LBT laser guide star system