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Accordingly, Edison installed on the locomotive a system of belting, including an idler-pulley which was used by means of a lever to tighten the main driving-belt, and thus power was applied to the driven axle. This involved some slipping and consequent burning of belts; also, if the belt were prematurely tightened, the burning-out of the armature.
The walls were lined with books and glazed cases, the tables crowded with the implements of chemical research; great glass accumulators glittered in the light; and through a hole in the gable near the shed door, a heavy driving-belt entered the apartment and ran overhead upon steel pulleys, with clumsy activity and many ghostly and fluttering sounds.
In the field, between the waiting stacks, was the thresher; the traction-engine which had dragged it there stood beyond, only harnessed to it now by the long driving-belt that would, when the time came, make of the thresher a living creature.
In line with the thresher stood the engine, looped to it by trembling curves of driving-belt, that wavered like a great black ribbon from the driving-wheel of the traction-engine to that of the thresher, and that showed a line of quivering light along its edge. A trail of dark smoke blew ceaselessly from the traction-engine, staining the blue of the sky, against which it faded and died away.
He stood high upon a platform and pitched sheaves from the wagons upon the sliding track of the ponderous, rattling threshing-machine. The engine stood off fifty yards or more, connected by an endless driving-belt to the thresher. Here indeed were whistle and roar and whir, and the shout of laborers, and the smell of smoke, sweat, dust, and wheat. Kurt had arms of steel.
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