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Updated: June 11, 2025
This was the famous "Gnome" engine, by means of which races almost innumerable have been won, and amazing records established. We have already referred to the engine shaft of the motor-car, which is revolved by the pistons of the various fixed cylinders.
Conceive this conceive these Shapes as animate and flexible; beating down with the prodigious mallets, smashing from side to side as though the tremendous pillars that held them were thousand jointed upright pistons; that as closely as I can present it in images of things we know is the picture of the Hammering Things. Behind them stood a second row, high as they and as angular.
There was some talk about turbine engines, direct application of steam, and the absence of pistons, rods, and cranks, all of which was beyond me, for I was familiar only with sailing craft; but I did understand the last words of the engineer. "Four thousand horse-power and forty-five miles an hour, though you wouldn't think it," he concluded proudly. "Say it again, man! Say it again!"
The word cylinder is used in a conventional sense only, since the cavities acting as such are circular, whose axes, instead of being straight lines, are arcs of circles struck from the center at which the axes of the shafts would, if continued, intersect. The four pistons are carried upon the gimbal ring, which connects, by means of pivots, the two chair couplings.
Even as we were at odds in our physical builds and our dispositions, so were we in our studies. From the beginning Hobart has had a mania for screws, bolts, nuts, and pistons.
The workshop where these guns are made and the tools used were next shown us, and were very remarkable. An open shed with a couple of small mud forges were the chief objects visible. The bellows consisted of two bamboo cylinders, with pistons worked by hand. They move very easily, having a loose stuffing of feathers thickly set round the piston so as to act as a valve, and produce a regular blast.
"Right," agreed Captain Anderson; "but whatever is on his trail will have to travel pretty lively to catch him. Look at him come!" As the stranger dashed toward them, head hanging and arms working like pistons, the three friends suddenly broke into a loud laugh. A more comical-looking specimen of humanity would be hard to imagine. The friends looked him over carefully as he came on.
H, J, and K represent three stages of blading. R indicates a small adjustable collar placed inside the housing of the main bearing B to hold the spindle in a position where there will be such a clearance between the rings of the balance pistons and those of the cylinder as to reduce the leakage of steam to a minimum and at the same time prevent actual contact under varying temperature.
One of the greatest causes of waste from elevators is the wearing out of the piston packing, this being particularly troublesome in most of the Western cities, where the water supplied is to a large extent from turbid streams, carrying more or less fine sand or "grit," which cuts out the packing of the pistons very rapidly.
There was such a simmering, and hissing, and bubbling of boiled, and broiled, and fried such a whirling, and jerking, and creaking of wheels, and cranks, and pistons such clouds of steam, and vapours, and even smoke, notwithstanding all of the latter that was burnt, that I almost thought myself in some great manufactory.
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