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Updated: May 28, 2025
There he sees the cable ranged, the windlass disconnected, the compressors opened; and there, after giving his own last order, "Stand clear of the cable!" he waits attentive, in a silent ship that forges slowly ahead towards her picked-out berth, for the sharp shout from aft, "Let go!"
Steam-driven air compressors are usually run at a piston speed of about 350 feet per minute, or from 60-80 revolutions per minute of compressors of average sizes, say 18" diameter of cylinder. Sixty revolutions per minute is equal to 120 strokes, or two strokes per second.
"I believed it, all right, but anybody likes to look at the United States Mint!" "You 've said it. She 's going to be more than that when we get a few portable air compressors in here and start at this thing in earnest with pneumatic drills. What's more, the old man has declared Taylor Bill and me in on it for a ten per cent. bonus. How's that sound to you?"
Indeed for some distinct ideal. The consummate seaman in him was aroused. He needed no directions. He knew what to do. Every effort, every movement was an act of consistent heroism. It was not for me to look at a man thus inspired. At last all was ready and I heard him say: "Hadn't I better go down and open the compressors now, sir?" "Yes. Do," I said. And even then I did not glance his way.
"Do you suppose we can handle the heat with our refrigerators?" asked Crane. "Probably. We have a lot of power, and the new arenak cylinders of our compressors will stand anything. The only trouble will be in cooling the condensers. We'll run as long as we have any water in our tanks, then go dive into the ocean to cool off. We'll try it a whirl, anyway."
Some straight line air compressors are so constructed that the momentum of the piston and other moving parts is nearly sufficient to equalize the strains without a fly wheel; but the fly wheel is there because it insures a definite length of stroke, and because it enables us to operate eccentrics and to regulate the speed of the engine uniformly.
Long-stroke air compressors are evidently objectionable on the basis of greater expense of construction. All the parts must be larger and heavier. The fly wheels are increased enormously in diameter and weight, and the strength of bearings must be enlarged in proportion. It is difficult to equalize power and resistance in air compressors with long strokes.
Poppet valve compressors almost invariably show a slight vacuum, due to several causes, mainly the duty performed in compressing the springs of the valves, but the vacuum is also influenced by insufficiency of valve area, hot air cylinders, etc.
In his hand he gripped a small segment of black fabric, a piece torn from an invisible cloak! Snap was rigging the hand compressors. If he could get the pressure back in the tanks.... I swung on Coniston. "You armed?" "Yes." He was white-faced and confused, but not in a panic. He showed me his heat ray cylinder. "What do you want me to do?" "Round up the crew. Get all you can.
Do not forget, you captains of men, when you grease and trim your pumps and compressors and rotators, that the human machine needs some tending also. I had put up the wireless mast above the conning-tower, and had no difficulty in calling up Captain Stephan. He was lying, he said, off Ventnor and had been unable to reach his station, on account of engine trouble, which he had now set right.
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