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Updated: July 5, 2025
We hurry into the heavy rubber suits the engineers are already dressed and inflate at the air-pump taps. G.P.O. inflators are thrice as thick as a racing man's "flickers," and chafe abominably under the armpits. George takes the wheel until Tim has blown himself up to the extreme of rotundity. If you kicked him off the c. p. to the deck he would bounce back.
Astronomical apparatus, instruments for measuring specific weights, clocks and chronometers, methods of measuring the velocity of falling bodies, freezing and boiling points, strength of gunpowder, magnetic instruments in short, all kinds of ingenious mechanical devices in all branches of science and mechanics. It was he who made the famous air-pump of Robert Boyle, based on Boyle's plans.
Though the diver was shielded by the impenetrable fickle element that gave Achilles invulnerability, the air-pump above was exposed, and thus the diver might be slain by indirection. There lay Achilles' heel, the exposed vulnerable part that Mother Thetis's baptism neglected.
It began with a powerful galvanic battery, succeeded by a wiry labyrinth of coils and helices, with little keys in front of them like a telegraph-office retired from business; these gave place to many-necked jars wired together by twos and threes, like oath-bound patriots plotting treason; beyond them stood a great glass globe, connected with a sizable air-pump, and filled with a complexity of shiny wires and glassware; next loomed up a huge induction-magnet, carefully insulated on solid glass supports; and at the further extremity of the table lay a corpse.
By main force they were able to raise the hogshead to the surface, but not above it. As the air-pump continued to work all the while, Eads, though wondering what was amiss, sat patiently in his place, till finally he saw a hand appear under the rim of the hogshead. Seizing this, he ducked under and got out.
The sky was hazy; the air thick and oppressive, from the heat of the sun acting upon the dense medium of a mist that hung on the water; there was not a breath of wind to ruffle the surface of the calm deep; the only sound heard was the whizzing of the air-pump, and the clang of the apparatus by which it was worked. There was nothing seen of the bell; it was far down in the bosom of the deep.
Observe all these little bell-glasses which communicate with the air-pump. I shave my patient's head, grease it a little, and fix on the bell-glass, which is exactly shaped to fit the organ in length and breadth. I work the air-pump, and raise the organ by an exhausted receiver. It cannot fail. There is my butler, now; a man who escaped hanging last spring assizes on an undoubted charge of murder.
For this purpose I unrigged the air-pump apparatus, and almost, but not quite, closed the valve, leaving an aperture about the twentieth part of an inch in diameter.
This system, in which I dispensed with the packing for air-pump buckets of condensing steam-engines, I have also applied to the pistons of the steam cylinders, especially those of high-pressure engines of the smaller vertical construction, the stroke of which is generally short and rapid.
The air-pump and supply of chloride of calcium would not be as heavy or bulky as the tanks and powders needed for development. By means of the air-pump the films could be sealed in tin tubes free from moisture and kept thus until arrival at home or at a city where the air was fairly dry and cold water for washing could be had. While I cordially agree with most of the views expressed by Mr.
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