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Updated: June 11, 2025
In Stephenson's pistons the screws were at one time liable to work slack, and the springs to break. Q. Will you explain the connection of the piston rod with the connecting rod?
Rotation of the cylinders in engines of this type is produced by the side pressure of the pistons on the cylinder walls, and in order to prevent this pressure from becoming abnormally large it is necessary to keep the weight of the piston as low as possible, as the pressure is produced by the tangential acceleration and retardation of the piston.
Fed by hate and slowly accumulated stores of bitter anger, his thoughts went throbbing in and out the lighted convolutions of his brain with the silent positive efficiency of a gas-engine's pistons. Bill understood everything in the world that night in his own world, and he overlooked nothing. He would have given much, very much, to have been able to remove Jean's camp a mile or so away.
The beds were berths against the wall, much as in the Pullman cars of to-day. In the very "nose" of the Annihilator was the pilot house. Here were grouped together the wheels, levers, cams, gears, pistons and other apparatus that controlled the big projectile.
The pistons are cast-iron, fitted with ordinary cast-iron spring rings. An aluminium crank case is used, being made in two halves connected together by bolts, which latter also attach the engine to the frame of the machine.
By this means the shaft, K, is relieved of all side pressure. The exhaust-port, which is very large and relieves all back pressure, is shown at D. The pistons and disks are made to balance at the speed at which the engine is intended to run. The steam-valve, for which patent is pending, is new in principle. It has a uniform rotating motion, and, like the engine, is steam and mechanically balanced.
Now, if the effective velocity of the centre of pressure and the velocity of the pistons had been the same, then a pressure of 2900 Lbs. upon the vertical paddles would have been balanced by an equal pressure on the pistons, which would have been in this case about .75 Lbs. per square inch; but as the effective velocity of the centre of pressure is 4.997 feet per second, while that of the pistons is only 3.66 feet per second, the pressure must be increased in the proportion of 4.997 to 3.66 to establish an equilibrium of pressure, or, in other words, it must be 1.02 Lbs. per square inch.
The labyrinth packing of the high-pressure and intermediate pistons has a small axial and large radial clearance, whereas the labyrinth packing of the piston Z has, vice versa, a small radial and large axial clearance.
In Holly's pump, instead of uniform teeth, and depending on the fit of the teeth with the side of the case and with each other for the packing, there are two large teeth in each piston opposite each other, which have slide pistons, and intermediate with these large teeth are small cogs, which continue the motion of the rotary pistons.
What do they mean by it?" The call bells began to rage. Frederick turned, and ran down the endless corridor to the after part of the vessel. Nobody intercepted him. He passed the windows of the engine-room. The cylinders and pistons were not stirring.
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