Page:Devonshire Characters and Strange Events.djvu/602

498 cylinder, the other admitting the cold jet into it to condense it.

The story has been often told how that a boy named Humphry Potter was planted beside the engine to turn the cocks, and found that this was excessively tedious and monotonous work, and being a shrewd lad, observing the alternate ascent and descent of the beam above his head, worked by the piston, he thought that by attaching to the beam the levers that governed the cocks, that would do the work for him. The result was the contrivance of what he called the scoggan, consisting of a catch, worked at first by strings, and afterwards by rods, that did the work automatically. This story has however been discredited. See Galloway's Steam Engine, 1881.

"Thus, step by step," says Mr. Smiles, "Newcomen's engine grew in power and efficiency, and became more and more complete as a self-acting machine. It will be observed that, like all other inventions, it was not the product of any one man's ingenuity, but of many. One contributed one improvement, and another another. The essential features of the atmospheric engine were not new. The piston and cylinder had been known as long ago as the time of Hero (222-205 B.C.). The expansive force of steam and the creation of a vacuum by its condensation had been known to the Marquess of Worcester, Savery, Papin, and many more.

"Newcomen merely combined in his machine the result of their varied experience, and, assisted by the persons who worked with him, down to the engine-boy Potter, he advanced the inventions several important stages, so that the steam-engine was no longer a toy or a scientific curiosity, but had become a powerful machine capable of doing useful work."