Hancock invented an ingenious boiler that could resist high pressures, and that was very solid and manageable. In 1834, from August to November, Hancock put to work his two steam vehicles , called "the Era" and "the Autopsy" between London and Paddington, reaching to transfer altogether near 4,000 passengers and marching at the speed of 32 kilometers per hour. Alexander Gordon, who wrote in 1832, mentioned boilers for road locomotives , which he said they worked at high pressures of up to 200 pounds by square inch, and machines which gave a power of 30 horsepower, constructed for this service. Also he describes coarse condensers, to condense the steam that had been used in the machine of the road locomotives , of such a way that it could return to the boiler, anticipating therefore the more advanced type of machines of the following times. The coke was almost the exclusively used fuel.
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