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By Robert H. Thurston

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Two gauge cocks, c c, and a safety valve, 19 are represented in the figure, but it will be noticed that the latter is quite different from the now usual form. Here, the pressure used was hardly greater than that of the atmosphere, and the weight of the valve itself was ordinarily sufficient to keep it down. The condensing water, together with the water of condensation, flows off through the open pipe tv. Newcomen's first engine made 6 or 8 strokes a minute; the later and improved engines made 10 or 12.

AT the beginning of the eighteenth century every element of the modern type of steam engine had been separately invented and practically applied. The character of atmospheric pressure, and of the pressure of gases, had become understood. The nature of a vacuum was known, and the method of obtaining it by the displacement of the air by steam, and by the condensation of the vapor, was understood. The importance of utilizing the power of steam, and the application of condensation in the removal of atmospheric pressure, was not only recognized, but had been actually and successfully attempted by Morland, Papin, and Savery.

This little book was presented to the Academy, and very favorably noticed. Papin now became w ell known among contemporary men of science at Paris, and was well received everywhere. Soon after, in the year 1678 as stated by the Joureeal des Savants, he left Palis and took up his residence in England, where he very soon made the acquaintance of Robert Boyle, the founder, and of the members of the Royal Society. Boyle speaks of Papin as having gone to England in the hope of finding a place in which he could satisfactorily pursue his favorite studies.

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A history of the growth of the steam-engine by Robert H. Thurston

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