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Updated: July 3, 2025
Often had Mrs Marrot heard her husband talk of tyres and driving-wheels, and many a time had she seen these wheels whirling, half-concealed, in their appropriate places, but never till that day had she seen the iron hoop, eight feet in diameter, elevated in bare simplicity on a turning-lathe, where its size impressed her so much that she declared, "she never could 'ave imagined engine-wheels was so big," and asked, "'ow did they ever manage to get 'em lifted up to w'ere they was?"
There was a snow-choked drumming of the exhaust, and the driving-wheels spun wildly in the flurry beneath. But there was no inch of forward motion, and Ford gave it up. "We're against it," he admitted. "Back her down and we'll put the shovelers at it again while you're nursing her up and getting more steam. We're going to make it to Saint's Rest to-day if the Two-six has to go in on three legs."
This was accomplished by means of heavy wood blocks well shellacked or otherwise treated to make them water and weather proof, placed radially on the inside of the wheels, and then substantially bolted to the hubs and rims of the latter. "The weight of the locomotive was distributed over the driving-wheels in the usual locomotive practice by means of springs and equalizers.
The height up to which the driving-wheels are usually geared may be taken as an indication of the ease with which any class of machines runs. A rider on a low-geared machine can start his machine much more quickly than an equal man on one that has high gearing, and therefore in a race he has an advantage at first, which he speedily loses as his rapid pedaling begins to tell.
With each revolution of the driving-wheels, each cylinder there is one on each side of every locomotive blew its steamy breath into the stack twice. This kept the fire glowing and made the chou-chou sound that everybody knows and every baby imitates.
Hence Trevithick, in his patent, provided that the periphery of the driving-wheels should be made rough by the projection of bolts or cross-grooves, so that the adhesion of the wheels to the road might be secured. Following up the presumed necessity for a more effectual adhesion between the wheels and the rails, Mr.
The first four engines, which had hauled the train as far as Erie, were of what is known as the American type eight-wheelers, comparatively light, but built for fast speeds. These locomotives weighed only 52 tons, with 17 by 24-inch cylinders and 72-inch driving-wheels.
McCloud at last gave the awaited signal, and, with keen-eyed, anxious men watching every revolution of the cautious driving-wheels, the engine, hissing and pausing as the air-brakes went off and on, pushed the light caboose slowly out on the rough spur to its extreme end and stopped with the pilot facing the main track at right angles; but before it had reached its halting-place spike-mauls were ringing at the fish-plates where a moment before it had left the line on the curve.
"The current was taken from the rims of the driving-wheels by a three-pronged collector of brass, against which flexible copper brushes were pressed a simple manner of overcoming any inequalities of the road-bed. "The late Mr.
The modern improvements made on locomotives consist chiefly in clothing the boiler with wood, felt, and other non-conductors to increase the life-giving heat; in heating the feed-water, coupling the driving-wheels, working the cylinders horizontally, economising steam by cutting off the supply at any part of the stroke that may be required, and economising fuel by using raw coal instead of coke, and consuming the smoke, besides many other minor contrivances, but all the great principles affecting the locomotive were applied by George Stephenson, and illustrated in the "Rocket."
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