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Updated: June 11, 2025
In the rickety engine-room something had burst loose under the strain. Now as she sank and reeled there came a hissing of steam; a gasping, coughing, hammering convulsion of pistons, rods and driving shafts, suddenly turned into a junk heap running amuck. It is questionable whether there would have been time to lower away boats had the most perfect discipline and heroism prevailed.
But never mind, since she wills it, we'll shake the dust off our Michelins, and when we're outside, you will have got far enough in your motoring lesson, I think, to try driving." I seemed to have looked through glass walls into the cylinders, at the fussy little pistons working under control of the "governor," a tyrant, I felt sure.
The cylinders of both these types were cast in pairs, and, instead of the water jackets forming part of the casting, as in the design of the original four-cylinder Mercedes-Daimler engine, they were made of steel welded to flanges on the cylinders. Steel pistons, fitted with cast-iron rings, were used, and the overhead arrangement of valves and cam-shaft was adopted.
Manly made a number of experiments, and finally decided on radial design, in which the cylinders are so rayed round a central crank-pin that the pistons act successively upon it; by this arrangement a very short and compact engine is obtained, with a minimum of weight, and a regular crankshaft rotation and perfect balance of inertia forces.
A. There are two safety valves, consisting of pistons 1-3/16 inch in diameter, and which are kept down by spiral springs placed immediately over them. A section of this valve is given in fig. 58. Q. What are the dimensions of the feed pumps? A. The feed pumps are of brass, with plungers 4 inches diameter and 3-1/4 inches stroke. The feed pipe is of copper, 2 inches diameter.
Even when our speed increased, these engines continued working without noise, and with remarkable smoothness There was never one of those inevitable breaks, with which in most motors the pistons sometimes miss a stroke. I concluded that the "Terror," in each of its transformations must be worked by rotary engines. But I could not assure myself of this. For the rest, our direction did not change.
Supposing, however, for the sake of a reductio ad absurdum, that the full boiler pressure had been maintained upon the pistons for the whole length of their strokes, the adhesion of the coupled driving wheels, not deducting the internal resistances of the engine, would have been 15028/40050 3/8 of the weight upon them.
Then there comes a loud hiss, with a heavy escape of steam, as the huge pistons tug and pull at the heavy wheels, which slip round and round and fail to grip the rail. Then, as gradually scientific power overcomes brute force, there is a forward motion of a scarcely perceptible character.
Before the simplicity of our cars was arrived at, inventors had to give up boilers, fire-boxes, valves, steam-pipes, cylinders, pistons, wheels, cranks, levers, and a host of minor parts. Wheels died hard.
The two smaller balance pistons, L and M, are allowed to remain on the high-pressure end; but the largest piston, Z, is placed upon the low-pressure end of the rotor immediately behind the last ring of blades, and working inside of the supplementary cylinder W. Being backed up by the body of the spindle, there is ample stiffness to prevent warping.
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