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Updated: July 5, 2025
The two small cylinders connected by a piston-rod on the right hand side of every locomotive just in front of the cab form the air-pump. It is always at work while a train is standing still, forcing air through lengths of rubber hose between the cars and into the reservoirs located beneath each one.
As long as the abdominal air-pump can be extended into the atmosphere, so long does the pile of bubbles grow until the insect is deep buried, and to penetrate this is as unpleasant an achievement for small marauders as to force a cobweb entanglement.
Tait and Dewar have calculated that, in a good modern vacuum, the length of the free path of the remaining molecules not taken away by the air-pump easily reaches a few centimetres. This result is not an hypothesis but a very great probability.
Undine shades of La Motte Fouqué is quite the most disagreeable girl in our fiction. She has been put under a glass and subjected to the air-pump pressure of Mrs. Wharton's art. She is a much more viable creature than the author's earlier Lily Bart, the heroine of The House of Mirth.
At the end of the "save-all," where the fibers are to leave the "wire" for the next stage of their journey, suction-boxes are placed, provided with an air-pump to take up the surplus water that has not yet found its way through the meshes.
When I went on board of the lighter, from which the bell was suspended, I examined the apparatus. The bell was then down, the men stood holding the crane, and listening attentively to hear the signals that were, every now and then, coming from the divers. At a little distance was the apparatus of the air-pump, which several other workmen were busily engaged working.
The first condensing steam-engine to which I applied an air-pump bucket, entirely without packing, was the forty horsepower engine, which I constructed for the Bridgewater Foundry. It answered its purpose so well that, after twenty years' constant working, the air-pump cover was taken off, out of curiosity, to examine the bucket, when it was found in perfect order.
So it is with the atmosphere: the air that is above is sustained by the air that is beneath; and when the air is pumped away from beneath them, the change occurs which you saw when I placed my hand on the air-pump, and which you saw in the case of the bladder, and which you shall see better here.
They are connected with an air-pump in charge of trustworthy men; they signal for their tools and material, as well as air, by means of a special line for this purpose. At some distance below the water the extraordinary weight of the suits cannot be felt, and the divers work as well in armor as in ordinary laboring clothes.
As we shoot a bird flying, they take a man in the midst of his business or pleasure, and knock him down with an apoplexy. Some of them, perhaps, are virtuosi, and delight in the operations of an asthma, as a human philosopher in the effects of the air-pump. To swell a man with a tympany is as good sport as to blow a frog.
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