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The driving-wheels revolved at first with such tremendous rapidity that they failed to "bite" and merely slipped on the rails. Thomson was engineer enough to understand why, and at once cut off part of the steam. Next moment he shot out of the station, and, again letting on full steam, rushed along the line like an arrow!
The ceiling of the building, or rather the place where a ceiling ought in ordinary circumstances to have been, was alive with moving bands and whirling wheels. The first thing she was called on to contemplate was the turning of the tyre or rim of one of the driving-wheels of a locomotive.
Then the reversing lever went forward with a clang, and the steam squealed shrilly in the dry-pipe. For a thunderous second or two the driving-wheels slipped and whirled futilely on the snowy rails. Gallagher pounced upon the sand lever, whereat the tires suddenly bit and held and a long-drawn, fire-tearing exhaust sobbed from the stack. "You've got her!" shouted Ford. "Now hit it hit it hard!"
The engineer not being aware of anything wrong with the train, glided serenely along, unconscious of the pandemonium, in the rear. But when all had about left the train, and the great driving-wheels began to spin around like mad, from the lightening of the load, the master of the throttle looked to the rear.
The pair of them laid on to the spokes of the driving-wheels, and with a yeo-heave-yeo managed to head the Despardoux in the direction of its native Stackport. Then the farmer settled to work again, Grace scurried about searching for ammunition, and the three young touts rained shower on shower of stones.
What possible object can there be to my remembering that the engine which hauled us from Calais to Paris in 1865 was built by J. Cail of Paris, on the "Crampton" system; that is, that the axle of the big single driving-wheels did not run under the frame of the engine, but passed through the "cab" immediately under the pressure-gauge? nor can any useful purpose be served in recalling that we crossed the Channel in the little steamer La France.
He looked at the semicircle of bold, unwinking headlights, heard the low purr and mutter of the steam mounting in the gauges scornful hisses of contempt as a slack valve lifted a little and would have given a month's oil for leave to crawl through his own driving-wheels into the brick ash-pit beneath him. .007 was an eight-wheeled "American" loco, slightly different from others of his type, and as he stood he was worth ten thousand dollars on the Company's books.
The piston is connected with the engine-crank and revolves the shaft, which is in turn connected with the driving-wheels. This is called a two-cycle motor, because two complete revolutions are necessary to accomplish all the operations. Many machines are fitted with heavy fly-wheels, the swift revolution of which carries the impetus of the power stroke through the other three operations.
A layman in the Professor's place would have jumped; but he, good man, looked upon his escape as one of the incidents of automobile travel. "When I accepted your invitation, my dear fellow, I expected something beyond the ordinary. I have not been disappointed." It was a wonder the driving-wheels were not dished by the violent side strains, but they were not even sprung.
"Endless leather belting was used to transmit the power from the motor to the counter-shaft, and from the latter to the driving-wheels, which were the front pair. A vertical idler-pulley was mounted in a frame over the belt from motor to counter-shaft, terminating in a vertical screw and hand-wheel for tightening the belt to increase speed, or the reverse to lower speed.
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