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Updated: May 17, 2025
As the train sped on, the engineer moved the reversing-lever notch by notch nearer the centre of the guide. This adjusted the "link-motion" mechanism, which is operated by the driving-axle, and cut off the steam entering the cylinders in such a way that it expanded more fully and economically, thus saving fuel without loss of power.
This machine was laid on its side, with the armature end coming out at the front of the locomotive, and the motive power was applied to the driving-axle by a cumbersome series of friction pulleys.
By degrees the unwieldy mass of misshapen metal was pounded into a cylindrical form, and Will Garvie informed his friends that this was the beginning of the driving-axle of a locomotive. Pointing to several of those which had been already forged, each having two enormous iron projections on it which were afterwards to become the cranks, he said
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