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Updated: May 26, 2025
He had a way of running straight at a tackler and then shifting direction in such a manner that you couldn't seem to bring him down. And then, of course, he was clever in using the straight arm and he always ran with high knee-action. When you tackled him it felt just as if you were tackling a man with a dozen legs, all of which were going up and down like the piston rod on a steam engine.
A. In a high pressure engine the steam, after having pushed the piston to the end of the stroke, escapes into the atmosphere, and the impelling force is therefore that due to the difference between the pressure of the steam and the pressure of the atmosphere.
"That compresses it, and then a tiny electric spark comes just at the right moment to explode it, and the explosion sends the piston down again, and turns the shaft. Well, all four cylinders have an explosion one right after another, and that keeps the shaft going."
These reciprocations run from 150 to 180 per minute. The space beneath the piston C is in communication with the large steam chest, where exists the initial pressure through the port A; the admission of steam to the piston C being controlled by a needle valve B. The pilot valve connects the port E, leading from the space beneath the piston to an exhaust port I.
Then, for involuntarily he now did everything running, with a dash up the steps he seized the sullen pendant bell-handle, and worked it pumpwise, till he perceived a smaller bell-knob beside the door, at which he worked piston- wise.
Impressed with this belief, he set to work and made a box about eighteen or twenty inches square and four feet high, with a valve in the bottom to let air in, a hole in the front to let it out, and a sort of piston to force it through the hole. By means of a long lever the piston could be raised, and by heavy weights it was pushed down.
Dull and regular, it sounded like the piston of an engine or a great drum, heard through the noises of a factory.
In locomotive engines the piston rod is made 1/7th of the diameter of the cylinder, and it is obvious that where the pressure on the piston is great, the piston rod must be larger than when the pressure on the piston is small. Q. What are the proper dimensions of the main links of a land beam engine?
An exact cylinder would leave no room for leakage between its smooth and true surface and the piston; but the solution of another difficulty was not so easily indicated.
Now if you have the pressure on the piston per square inch, and if you know the number of square inches in its area, and the velocity with which it moves in feet per minute, you have obviously the dynamical effort of the engine, or, in other words, its actual power. Q. How is the base line you have referred to obtained?
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