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Updated: July 5, 2025


Then he set the electric air-pump going, in order to store up for himself a supply of air sufficient to last until the return of the boat. And while this was doing he quietly dropped the boat astern until she lay in the deep shadow cast by the overhanging counter of the yacht, where the other two could board her without the slightest risk of being seen.

The man, in less than ten minutes, unscrewed a plate at the farther end, and fixed on an air-pump, made for the purpose, on which the door of the stove suddenly slammed to. Our host saw the accident, and hurrying to open the stove, fell over a heap of channelled logs, and cut a gash in his forehead.

And that it is the resistance of the air, and not any diminution in the power of attraction, which causes the feather to lag behind, may be proved by experiment; for if you let a feather and a coin drop together from the top of the exhausted receiver of an air-pump, they will both be seen to descend at the same rate, and reach the bottom at the same instant; a fact which may be demonstrated more simply by placing the coin and feather free of each other in a paper cone, and letting the cone fall with its apex downwards, so as to break the air's resistance; or by suspending a piece of gold-leaf in a bottle, and letting the bottle drop of course short of the ground in which case the included leaf will be seen to have gone as fast and as far as the bottle.

The president of the Royal Astronomical Society of Great Britain proved to the satisfaction of most of his colleagues that a nebula could not possibly contain enough water to drown an asteroid, let alone the earth. "The nebulae," said this learned astronomer, amid the plaudits of his hearers, "are infinitely rarer in composition than the rarest gas left in the receiver of an exhausted air-pump.

After the discovery of atmospheric pressure had led to the invention of the air-pump by Otto Guericke; and after it had become known that evaporation increases in rapidity as atmospheric pressure decreases; it became possible for Leslie, by evaporation in a vacuum, to produce the greatest cold known; and so to extend our knowledge of thermology by showing that there is no zero within reach of our researches.

As no air-pump can by any means make a perfect vacuum, so neither can any artist entirely exclude the conventional, the local, the perishable from his book, or write a book of pure thought, that shall be as efficient, in all respects, to a remote posterity, as to contemporaries, or rather to the second age.

"But we have a diving-suit and air-pump," said Mr. Shack, enthusiastically, "and fifty men ready to dive without suits. We can raise her, captain, in two weeks." "Gentlemen," said Captain Bunce, grandly, "I have full faith in your seamanship and skill. I leave the work in your hands." Which was equivalent to an admission that he was fat and lazy, and did not care to take an active part.

Phil's leap and quick work at Madge's air-pump must have taken place not more than three minutes afterward, but they were horrible, agonizing moments. Madge hardly knew how they passed. Captain Jules suffered the regret of a lifetime. How could he have been so unwise as to entrust the safety of this girl, whose life was so dear to him, to the perils of a diver's experiences?

"Excellent!" exclaimed the baronet. "I must again congratulate you, professor, on your truly wonderful forethought. And what is this, pray?" "That," said the German, "is the controlling lever of the air-pump. When we want to sink into the depths of the ocean, I thrust this lever over so; and the pump at once begins to pump air into the air- chambers."

One of his tubes contained the gas at the pressure of 30 inches of mercury, another at a pressure of 15 inches of mercury, a third at a pressure of 10 inches, while a fourth was exhausted as far as a good air-pump renders exhaustion possible.

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