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Their 225 horse-power twelve-cylinder engine ran at a normal speed of 2,000 revolutions per minute; the air screw was driven through gearing at half this speed, its shaft being separate from the timing gear and carried in ball-bearings on the nose-piece of the engine.
As will be seen from our engraving, the pillar which supports the radial arm is mounted on a massive baseplate, which also carries a circular table 6 ft. in diameter, this table having a worm-wheel cast on it as shown. This table is driven by a worm gearing into the wheel just mentioned.
On hard roads in a level country high gearing is all well enough, and a high average speed can be maintained, but where the roads are soft or the country rolling, a high gear may mean a very material disadvantage in the long run.
They attached small wheels about four feet in diameter to the sides of their ships; the passage of the water turned the wheels, and a very simple gearing was arranged which threw a pebble into a tallypot at each revolution.
The stability is further increased by chocking the wheels. Maneuver of the Apparatus. The carriage, having reached the place of accident, is put in place, its rear end is supported by the bar, C, the wheels are chocked, and the winches are placed upon the dynamo gearing.
Within twenty miles of Canandaigua the country is quite rolling and many of the hills steep. Twice we were obliged to get out and let the machine mount the grades, which it did; but it was apparent that for the hills and mountains of New York the gearing was too high.
To mitigate the shock of the air pump valves in cases in which a high speed has been desirable, as in the case of marine engines employed to drive the screw propeller without intermediate gearing, India rubber discs, resting on a perforated metal plate, are now generally adopted; but the India rubber should be very thick, and the guards employed to keep the discs down should be of the same diameter as the discs themselves.
"Everything worked to a charm, until, in starting up at one end of the road, the friction gearing was brought into action too suddenly and it was wrecked. This accident demonstrated that some other method of connecting the armature with the driven axle should be arranged.
No, he is not dead yet. The letter had evidently been intended for Cosette to read on the following morning; after the two discharges that were heard between eleven o'clock and midnight, nothing more has taken place; the barricade will not be attacked seriously until daybreak; but that makes no difference, from the moment when "that man" is concerned in this war, he is lost; he is caught in the gearing.
Their construction required learned calculations; the wood selected had to be of the hardest substance, and their gearing all of brass; they were stretched with levers, tackle-blocks, capstans or tympanums; the direction of the shooting was changed by means of strong pivots; they were moved forward on cylinders, and the most considerable of them, which were brought piece by piece, were set up in front of the enemy.
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