A history of the growth of the steam-engine . Fi«. 4.—Portas Apparatus, a. c. 1601. the forcing vessel—a plan often claimed as original withlater inventors, and as constituting a fair ground for specialdistinction. The rude engraving (Fig. 4) above is copied from thebook of Porta, and shows plainly the boiler mounted abovea furnace, from the door of which the flame is seen issuing,and above is the tank containing water. The openmg in thetop is closed by the plug, as shown, and the steam issuing THE PERIOD OP SPECULATION. 15 from the boiler into the tank near the top, the water isdriven out thr


A history of the growth of the steam-engine . Fi«. 4.—Portas Apparatus, a. c. 1601. the forcing vessel—a plan often claimed as original withlater inventors, and as constituting a fair ground for specialdistinction. The rude engraving (Fig. 4) above is copied from thebook of Porta, and shows plainly the boiler mounted abovea furnace, from the door of which the flame is seen issuing,and above is the tank containing water. The openmg in thetop is closed by the plug, as shown, and the steam issuing THE PERIOD OP SPECULATION. 15 from the boiler into the tank near the top, the water isdriven out through the pipe at the left, leading up from thebottom of the tank. Florence Rivault, a Gentleman of the Bedchamber to. Eio. 5.—De Oauss Apparatus, a. d. 1606. 16 THE STEAM-ENGINE AS A SIMPLE MACHINE. Henry IV., and a teacher of Louis XIII., is stated by , the French philosopher, to have discovered, as earlyas 1605, that water confined in a bomb-shell and there heat-ed would explode the shell, however thick its walls niightbe made. The fact was published in Rivaults treatise onartillery in 1608. He says : The water is converted intoair, and its vaporization is followed by violent explosion. In 1615, Salomon de Caus, who had been an engineerand architect under Louis XIII. of France, and later in theemploy of the English Prince of Wales, published a workat Frankfort, entitled Les Raisons des Forces Mouvantes,avec diverses machines tant utile que plaisante, in whichhe illustrated his proposition, Water will, by the aid offire, mount higher than its source, by describing a machinedesigned to raise water by the expanding power of steam. In the sketch here given (Fig. 5), and which is copiedfrom the


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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines