Page:Devonshire Characters and Strange Events.djvu/590

492 Desaguliers says that Savery's own account was this: Having drunk a flask of Florence at a tavern, and thrown the bottle into the fire, he proceeded to wash his hands, when he noticed that the little wine left in the flask was converted into steam. He took the vessel by the neck and plunged its mouth into the water in the basin, when, the steam being condensed, the water was immediately driven up into the bottle by the atmospheric pressure.

Switzer, however, who was very intimate with Savery, gives another account. He says that the first hint from which he took the engine was from a tobacco-pipe, which he immersed in water to wash or cool it. Then he noticed how that by the rarefaction of the air in the tube by the heat, the gravitation or pressure of the external air, upon the condensation of the steam, made the water to spring through the tube of the pipe in a most surprising manner.

However it was that Savery obtained his first idea of the expansion and condensation of steam and of atmospheric pressure, he had now before him a new and untried power with which to deal, and he was obliged to approach it by several tentative efforts.

Before 1696 he had constructed several steam pumping engines to mines in Cornwall, and he described these as already working in his book entitled The Miners' Friend. He took with him a model to London and exhibited it to William III in 1698, and the King promoted Savery's application for a patent, which was secured in July, 1698, and an Act was passed confirming it in the ensuing year.

Papin saw Savery's steam engine, when exhibited before the Royal Society, he also witnessed the trial