Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: October 22, 2025
Then the hissing noise began to dwindle down to a wheeze, and then it stopped all of a sudden. That meant that the air-pressure in the lock was the same as that in the tunnel. Paddy pushed open the door in the other end of the lock from that by which we had entered. Along the bottom of the completed tube we followed Paddy and Capps. On we trudged, fanned by the moist breath of the tunnel.
If they are understood only differences in construction and detail remain. Imagine a short tube into which you have inserted a pellet, or wad of any kind, so that it fits tolerably, yet moves easily back and forth in the bore of the tube. If this pellet or wad is at one end of the tube you may, by inserting that end in your mouth and putting air-pressure upon it, make it slide to the other end.
Fighting blindly against the tremendous air-pressure, which rendered me hardly able to move, I forced my left arm, inch by inch, along the edge of the "cockpit" until I succeeded in turning the switch lever downwards. A glance at the speedometer did not reassure me, the poor thing seemed very much overworked.
They stood motionless, locked in each other's arms, while DuQuesne dove through the opening and snapped the door shut behind him. The air-pressure and temperature back to normal, the cumbersome suits were hastily removed, and Seaton's lips met Dorothy's in a long, clinging caress. DuQuesne's cold, incisive voice broke the silence. "Every second counts. I would suggest that we go somewhere."
As the glass just begins to soften, the air-pressure will force it in, and care must be taken that the softening is uniform over the whole circumference of the tube. As the shrinking goes on, the tube is gently drawn out to make a thick-walled cone at that place, and the end is drawn off as soon as the tube is sealed.
When the blister air-pressure showed normal and green lights flashed and flashed, Bors got out of the boat and went to the Sylva's control-room. Gwenlyn was there, quite casually controlling the operation of the yacht by giving suggestions to its official skipper. She turned and beamed at Bors. "We'll pull off a way," she observed, "and make sure your time-bomb works.
We are now getting the air-pressure through the pipe in both ends of the tube alike, and do not move the pellet either way. To make it move we must do something more, and open one end of the tube, and close that fork of the air-pipe, and thus get all the pressure on one side of the pellet. Remove one finger from the end of the tube, and pinch the fork of the air-tube that is on that side.
Their only purpose was to get the piston lifted, and air-pressure did all the actual work. If you turn the tube, and put an air-pressure first at one end and then at the other, and pay no attention to vacuum or atmospheric pressure, you will have the principle of the later modern, almost universal, high-pressure, double-acting steam-engine.
"Air-pressure!" he exclaimed, as he shut it off. He had seen a line of bubbles rise as the thing dived. "An air-engine, and the whole thing must be full o' compressed air. The brass lever turns it on, and if the steel blade's up it gives it the slow motion; if it's down, she gets full speed at once. Now I know why it's blade-shaped. It's so the water itself can push it down after she starts."
I wondered about that, too; in those thousands of miles, and against this low air-pressure, you'd think they'd lose a lot. But the answer's simple; they float a skin of oil on the water." Putz nodded, but Harrison cut in. "Here's a puzzler.
Word Of The Day
Others Looking