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Updated: May 26, 2025
He took a neck in each hand and cracked their skulls together until the whack-whack-whack of it was like the exhaust of a Ford with loose piston rings; and when they fell from his grip, unconscious, he came to my rescue. Believe me, I needed it. They were as strong and lithe as wildcats, those Syrians, and fully awake to the advantage that the narrow door gave them.
The principal difficulty experienced in constructing the hydraulic press before the time of Bramah arose from the tremendous pressure exercised by the pump, which forced the water through between the solid piston and the side of the cylinder in which it worked in such quantities as to render the press useless for practical purposes.
In this engine a round pipe called a trunk penetrates the piston, to which it is fixed, being in fact cast in one piece with it; and the trunk also penetrates the top and bottom of the cylinder, through which it moves, and is made tight therein by means of stuffing boxes.
After careful examination I found that these jerks were caused by the small quantities of water that were occasionally carried along with the current of the steam, and deposited in the cylinder, where it accumulated above and below the piston, and thus produced the jerks.
A. The paddle shaft plummer blocks are altogether of brass, and are formed in much the same manner as the cap of the piston rod, only that the sole is flat, as in ordinary plummer blocks, and is fitted between projecting lugs of the framing, to prevent side motion. In the bearings fitted on this plan, however, the upper brass will generally acquire a good deal of play after some amount of wear.
In twenty minutes, sir, I think we can have the engines running smoothly once more." The naval officer was wise enough not to press the questioning further just then. Instead, he went on deck. Working like beavers, and with the assistance of others standing about, Jack and Hal had the piston replaced and all the other parts in place within fifteen minutes.
All that was then required to produce a most effective hammer was simply to admit steam of sufficient pressure into the cylinder, so as to act on the under-side of the piston, and thus to raise the hammer-block attached to the end of the piston rod.
The depth of the cutter through the piston is 0.017 times the square root of the pressure on the piston in lbs. per square inch, multiplied by the diameter of the cylinder in inches; and the thickness of the cutter through the piston is 0.007 times the square root of the pressure on the piston in lbs. per square inch, multiplied by the diameter of the cylinder.
Now insert in the water the end of a tube closed below by a cork which exactly fits the interior, but which can be moved up and down in the tube by means of a bar of iron or wood which runs through it. This is called a piston, I may as well tell you as we go on.
Now, if there was a cylinder of iron, with the inside turned perfectly true, and a brass piston fitted to it " "What is a piston?" said Nathan. "A piston," said his father, "is a sort of stopper, exactly fitted to the inside of a cylinder, so as to slide up and down. It is made to fit perfectly, and then it is oiled, so as to go up and down without much friction, that is, hard rubbing.
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