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Updated: May 3, 2025
It is reversed by means of the same mechanism used on locomotives the link-motion and reversing-lever, by which the direction of the steam is reversed and the engine made to run the other way. All steam-propelled automobiles, from the light steam runabout to the clumsy steam roller, are worked practically as described.
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.
Thus the invention of the blast-pipe is claimed for Trevithick, George Stephenson, Goldsworthy Gurney, and Timothy Hackworth; that of the tubular boiler by Seguin, Stevens, Booth, and W. H. James; that of the link-motion by John Gray, Hugh Williams, and Robert Stephenson. Indeed many inventions appear to be coincident.
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