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Updated: May 11, 2025
This, therefore, is the force which must be imparted at the circumference of the driving wheels, except that small part intercepted by the engine itself, and the force exerted by the pistons must be greater than that at the circumference of the driving wheel, in the proportion of their slower motion, or in the proportion of the circumference of the driving wheel to the length of a double stroke of the engine.
That night the two men and their black shadows were alone in the shed together. The shed was lit with one big arc light that winked and flickered purple. The shadows lay black behind the dynamos, the ball governors of the engines whirled from light to darkness, and their pistons beat loud and steady. The world outside seen through the open end of the shed seemed incredibly dim and remote.
It seemed to him that he had become involved in a vast piece of machinery, and that nothing short of blowing the theatre up with dynamite would bring the cranks and pistons to a stop. And yet it seemed to him also that everything was unreal, that the contracts he signed were unreal, and the proofs he passed, and the posters he saw on the walls of London, and the advertisements in the newspapers.
If both cylinders were set at right angles in the centre of the carriage, and the pistons were both attached to a central crank, there would be no oscillation produced; or the same effect would be realized by placing one cylinder in the centre of the carriage, and two at the sides the pistons of the side cylinders moving simultaneously: but it is impossible to couple the piston of an upright cylinder direct to the axle of a locomotive, without causing the springs to work up and down with every stroke of the engine: and the use of three cylinders, though adopted in some of Stephenson's engines, involves too much complication to be a beneficial innovation.
What seemed strange in the vessel was the substitution of lofty and straight smoke-pipes, rising from the deck, instead of the gracefully tapered masts... and, in place of the spars and rigging, the curious play of the walking-beam and pistons, and the slow turning and splashing of the huge and naked paddlewheels, met the astonished gaze.
I leaned forward, butting with my head, both doubled fists working like pistons to clear a way to my companions. "Nice work, Pete!" shouted Vic, as I joined them, breathless but triumphant. "Now for a break! Gun loaded?" I snapped open the action and dropped in six cartridges. "It is now. I'll go ahead; you bring up the rear with Hope in the middle. Ready?" "Let's go!"
Another good example of this type of engine was the Eole, which had eight opposed pistons, each pair of which was actuated by a common combustion chamber at the centre of the engine, two crankshafts being placed at the outer ends of the engine.
Walker had slipped back to his beloved engines. Had he not vowed that the massive pistons should again thrust forth their willing arms on or about New Year's day? He had forgotten the cannibals and their threats ere he was at the foot of the engine-room ladder. Courtenay and Tollemache joined him; Christobal went to the saloon to visit his patients; Elsie was left with Mr.
As each board is of 20 square feet of area, and there is a vertical board on each side of the ship, the total pressure on the vertical paddle boards will be 2900 Lbs. Q. What pressure is this equivalent to on each square inch of the pistons? A. A vessel of 200 horses power will have two cylinders, each 50 inches diameter, and 5 feet stroke, or thereabout.
The coefficient of friction between the cast-iron and steel is considerably less than that which would exist between two steel parts, and there is less tendency for the skirt to score the cylinder walls than would be the case if all steel were used so noticeable is this that many makers, after giving steel pistons a trial, discarded them in favour of cast-iron; the Gnome is an example of this, being originally fitted with a steel piston carrying a brass ring, discarded in favour of a cast-iron piston with a percentage of steel in the metal mixture.
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