The blades had barely touched the water when, at a distance of less than five yards from the cutter, appeared the twin periscopes of a submarine--this time the genuine article.
The eyes of all on the patrol-boat were fixed on the target--the two pole-like periscopes that were now almost in line as the submerged boat swung round so as to bring her torpedo-tubes to bear upon her intended victim.
On the other hand, if she exposed the tips of her periscopes only, such tactics would not be likely to result in definite destruction.
One shell hurtled within a few feet of the top of the conning-tower, sweeping away both periscopes in its career.
Before she could admit sufficient water ballast to make her heavy enough to swamp the two boats, the strain would wrench the periscopes from the submarine's hull.
He had seen partly submerged periscopes before, and they had never behaved in that erratic fashion.
Periscopes are four inches wide or less, and probably only 5 inches shows above the parapet, so you can see the German marksman at 100 yds.
How close the fire is here is shown by one of my companies having had two periscopes hit.
At length, apparently satisfied with her investigations, the submerged craft housed her periscopes and made off, leaving a tell-tale swirl upon the surface of the water.
The eyes of the periscopes were steadily fixed upon the battleplane as the invisible submarine slowly approached.
At least Athol had not noticed the periscopes until the vessel rose at a distance of a cables length away.
When the inrush of water forced the U-12 to rise to the surface and surrender, her crew discovered that the main hatch could not be opened because one of the periscopes had been bent down across it.
We can raise and lower the periscopes at will, and all our larger boats have two of them, so that they can keep a lookout in two directions at once, besides having a spare eye in case the first is put out.
Certain French and Dutch inventors designed submarines with periscopes as long ago as the eighteen-fifties.
All other vessels, except the one fitted with bottom wheels, were discovered long before reaching the outer fortifications, because it was necessary for them to show their periscopes to sight their way.
We had not received the periscopes or lights, and the boat was not entirely completed, but was sufficiently far advanced to make it safe for me to try her on a submerged run.
Some periscopes have been built with means for squirting alcohol, gasoline, or other substances to clear the object glass if ice or salt forms on it.
If they were under water in a submarine they could not see each other at all unless they had theperiscopes elevated above the surface.
Some of the early boats of the diving type were fitted with fixed periscopes through which one could see in one direction only, and that straight ahead, and with a limited field of vision.
If you were merely to submerge, and lie close by with only your periscopes showing, it seems to me that you might manage to take them unawares.
Either she had gone under altogether, or withdrawn to such a distance that her periscopes were invisible in the mist.
Before very long, however, we learned that the supposed periscopes were only the necks of swimming cormorants, and the 'conning tower washes' certain characteristic little humps of Pentlandesque waves.
In a few minutes, driving ahead at full speed, the Dewey was submerged until only her periscopes showed.
Soon her periscopesthrust their eyes out of the depths.
The periscopeshad been well out of water when the destroyer had first been sighted.
In a few moments the Dewey thrust her periscopes up out of the sea and set out in pursuit of the unknown ship.
At the same time the damaged periscopes were cut off in the conning tower to prevent an inflow of water when the ship dived.
Guess we'll lie here and wait for them to come along," whispered McClure to Cleary as the periscopes popped up out of the depths into the night gloom.
Something loomed up in the blue of the sky near him and he beheld for one instant the periscopes of the Dewey.
A German birdman, circling above on patrol duty, had observed the wake of the periscopes and had touched off a night flare.
As her periscopes cleft the crest of the waves again and she emerged into the arena of activity McClure caught sight of a destroyer off the starboard bow not more than five hundred feet away.
The periscopes showed another vessel, a second line battleship of the pre-dreadnought type, off the starboard beam.
Early dawn was streaking the sky with tints of orange gray when at last the submarine poked its periscopes above the waves.
Tilting fore and aft like a rocking horse, the submersible responded gradually to the lightening process until at last the depth dial showed only a margin of several feet needed to lift the eyes of the periscopes above the waves.
In two minutes she was submerged, only the tips of her periscopes showing.
Could not be better for our purposes had it been made to order," smiled McClure, as he gave orders for the repair crew to haul out the reserve periscopes and get busy.
The submarines were running submerged with only the tips of their periscopes showing.
His conning-tower and two periscopes showed not over thirty feet from the port side as we swept by.
I've had bullets knock dirt into my face, so that I thought that I was hit, and had periscopes smashed to bits in my hand.
By and by more periscopes were made by the sappers, and there were fewer casualties.
The rumor drifted in to us that there were ten periscopes to be seen, but soon it came down to three.
They fired point-blank and sent that periscope straight up to where all good periscopes go.
A few minutes later the periscopes of a number of submarines were noticed on the starboard bow of our battle-cruisers, which at once turned to port to avoid them.
Apparently the submarines do not observe their approach; their periscopes are steadily fixed on our ship, reckoning every yard they gain on us.
The periscopes of our submarine foes are still discernible, but beyond them is a fast-growing smoke-cloud from which presently emerge the lithe black hulls of our "X" destroyer flotilla.
These boats preserve the "porpoise" shape, are equipped with wireless apparatus, and provided with panoramic periscopes to enable them to sight their target when submerged.
They broke a good many of our periscopes in the same fashion; and the broken glass used to fly about in a very nasty way.
Many a time had the men of Anzac peered through their periscopes at that neck, and shaken their heads over the probable fate of any bold fellows who might venture to assault it.
I had five men cut about the face and head on one day, through theirperiscopes being broken at observation work.
There is, indeed, a great difference between the submarine boats of the early twentieth century which had to rely on their conning-tower for steering, and more recent boats with their wonderful periscopes and gyro compasses.
In the beginning periscopeswere rather crude appliances.
No periscopes had been provided because none of the instruments available at that time gave satisfaction.
Modern periscopes are complicated optical instruments which have been developed to a very high point of efficiency.
Two periscopes are provided; one at the forward end of the conning tower, and the other, of larger diameter, being forward and on the starboard of the conning tower.
Half a dozen periscopes showed short lengths, briefly, above the water, but the number of faint streaks across the sea showed that other enemy submarines were attacking without first taking periscope sights.
This manœuvre is now seldom necessary, owing to the long and wide range of vision of the two or three periscopes fitted in modern submarines.
In the more modern vessels three periscopes are fitted.
Three tall panoramic periscopes are fitted, and their high superstructures and increased buoyancy when travelling on the surface enable them to keep the sea in almost any weather.
They listened with satisfaction to the bursts, and through their trench periscopes watched the smoke and dust clouds billowing from the trench opposite.
Looking round in the direction from which, as it seemed to him, the weapons had been fired, Mark Redisham saw the submarine's two periscopes moving along the surface some three hundred yards away.
But of the submarine herself and her periscopes no more was seen.
As much as possible she was kept submerged, or with only her periscopes above the surface.
Submarines are not commonly supposed to be of great use in the darkness; their periscopes are then blind.
While the guns were firing and the Dainty was yet within sight of the drifters, Mark again saw the submarine, or, rather, he saw her periscopes moving above the surface about a mile away.
In direct advance of the cruiser, he distinguished for a moment the two periscopes of the enemy submarine making a ripple as they moved through the calm water.
From the pier as the boat went out, the periscopes of the second submarine were sighted, but before the gun could be trained it had disappeared.
No land was in sight, and the sea was clear of shipping; but in the wake he presently discovered the swiftly moving periscopes of two other submarines.
At first he thought it was a school of gambolling porpoises showing their fins, but presently the periscopes and conning-tower of a submarine rose to the surface.
Then we run, only periscopes showing, for the Gat of Norderney.
Diesel oil engines, sucked water into her ballast-tanks, and with only her periscopes showing above the surface, ran under her electric-motor power for Norderney Gat and Nordeich quay.
Periscopes have been universally adopted in trench warfare for observing the enemy while keeping completely under cover.
These periscopes enabled the men in the front-line trenches to look over the top with comparative safety.
Further facts about periscopes are set down in the chapter in this report relating to sights and fire-control apparatus.
The long periscopes were used in deep-shelter trenches and bomb proofs.
The production of the short-base periscopesand also of the battery commanders' periscopes by the Wollensak Optical Co.
Periscopes from 20 inches to nearly 20 feet in length were produced in quantity.
Each of my three periscopes had an angle of sixty degrees so that between them I commanded a complete semi-circle of the horizon.
We carried spare periscopesand a wireless mast, which could be elevated above the conning-tower when necessary.
Later, telescoping periscopes were used, which could be raised by means of a hand-lever.
And here were the periscopes or eyes of the submarine, rising from fifteen to twenty feet above the roof of the conning-tower.
The cover of her conning-tower hatchway was buckled, her twin periscopes had been snapped off close to the deck.
He had just caught a glimpse of the pole-like periscopes of a submarine ere they vanished beneath the surface of the placid sea.
Again the periscopes appeared above the surface and a prolonged examination of the British vessel was made.
After a lapse of a quarter of an hour the submarine cautiously poked her periscopes above the surface, although quite half a mile from the spot where she had previously dived.
Then they attached the broken periscopes to the parapets, so that the Turks looking over would see the periscopes above the trench, just as they would any ordinary day at the front.
Periscopes were served out, and placed about ten feet apart along the trench.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "periscopes" in a variety of sentences. We hope that you will now be able to make sentences using this word.
