In 1729, Stephen Switzer published his “Introduction to a general system of Hydrostaticks,” in two volumes quarto. He says:-- “Amongst the several Engines which have been contrived for the raising of water for the supply of houses and gardens, none has been more justly surprising than that of the raising of water by fire; the particular contrivance and sole invention of a gentleman, with whom I had the honour long since to be well acquainted; I mean the ingenious Captain Savery, some time since deceased, but then a most noted engineer, and one of the Commissioners of the Sick and Wounded. This gentleman’s thoughts (as appears by a preface of his to a little book, entitled, ‘The Miners’ Friend’), were always employed in Hydrostatics and Hydraulics; and the first hint from which it is said he took his engine, was from a tobacco pipe, which he immersed to wash or cool it, as is sometimes done; he discovered by the rarefaction of the air in the tube by the heat or steam of the water, and the gravitation or impulse of the exterior air, that the water was made to spring through the tube of the pipe in a wonderful surprising manner; though others say, that the learned Marquis of Worcester, in his ‘Century of Inventions,’ (which book I have not seen), see page 68, gave the first hint for this raising water by fire.”--Vol. ii. p. 325. Thirty-four years later, Dr. J. T. Desaguliers, F.R.S., and Chaplain to His Royal Highness, Frederick, late Prince of Wales, &c., published his “Course of Experimental Philosophy,” in two volumes, quarto, 1763. His 13th section is a discourse on the “Fire-engine,” as the steam-engine was then designated. And the following lecture treats largely on the Marquis of Worcester’s present article in the “Century,” which he quotes and then observes:-- “Captain Savery, having read the Marquis of Worcester’s book, was the first who put in practice the raising Water by Fire, which he proposed for the draining of mines. His Engine is described in Harris’s Lexicon (on the word _Engine_), which being compared with the Marquis of Worcester’s description, will easily appear to have been taken from him; though Captain Savery denied it, and the better to conceal the matter, bought up all the Marquis of Worcester’s books that he could purchase in _Pater-Noster-Row_, and elsewhere, and burned them in the presence of the gentleman his friend, who told me this. He said that he found out the power of steam by chance, and invented the following story to persuade people to believe it, viz., that having drank a flask of Florence at a tavern, and thrown the empty flask upon the fire, he called for a bason of water to wash his hands, and perceiving that the little wine left in the flask had filled up the flask with steam, he took the flask by the neck, and plunged the mouth of it under the surface of the water in the bason, and the water of the bason was immediately driven up into the flask by the pressure of the air.”