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Henry Bell had in 1800 experimented with a steamer on the Clyde; but it aroused the same trembling curiosity as Trevithick's first locomotive, or as Fulton's first paddle-boat built on the Seine in 1803. In fact, this boat of the great American inventor was so weak that, when at anchor, it broke in half during a gale, thus ridding itself of the weight of its cumbrous engine.
This was the engine erected by him for Blenkinsop, to work the Middleton colliery railway near Leeds, on which it began to run in 1812, and continued in regular use for many years. In this engine he introduced the double cylinder Trevithick's engine being provided with only one cylinder, the defects of which were supplemented by the addition of a fly-wheel to carry the crank over the dead points.
Watt introduced his steam to the cylinder at only slightly more than atmospheric pressure and clung tenaciously to the low-pressure theory all his life. Boulton and Watt, indeed, aroused by Trevithick's experiments in high-pressure engines, sought to have Parliament pass an act forbidding high pressure on the ground that the lives of the public were endangered.
The men whose names are cardinal in the history of this development invented, for the most part, in a quite empirical way, and Trevithick's engine was running along its rails and Evan's boat was walloping up the Hudson a quarter of a century before Carnot expounded his general proposition.
Henry Bell had in 1800 experimented with a steamer on the Clyde; but it aroused the same trembling curiosity as Trevithick's first locomotive, or as Fulton's first paddle-boat built on the Seine in 1803. In fact, this boat of the great American inventor was so weak that, when at anchor, it broke in half during a gale, thus ridding itself of the weight of its cumbrous engine.
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