A descriptive and historical account of hydraulic and other machines for raising water, ancient and modern : with observations on various subjects connected with the mechanic arts: including the progressive development of the steam engine . his although nothing more than the old processof filling eolipiles, most of which could be charged in no other way,shows that the principle was well understood and adopted in variousoperations. We acd another and earlier example from Portas NaturalJMagic, a work first published in 1560, where he distinctly shows theformation of a vacuum by the condensation
A descriptive and historical account of hydraulic and other machines for raising water, ancient and modern : with observations on various subjects connected with the mechanic arts: including the progressive development of the steam engine . his although nothing more than the old processof filling eolipiles, most of which could be charged in no other way,shows that the principle was well understood and adopted in variousoperations. We acd another and earlier example from Portas NaturalJMagic, a work first published in 1560, where he distinctly shows theformation of a vacuum by the condensation of steam, and raising of waterinto it by the atmosphere. Make a vessel with a very long neck.; thelonger it is, the greater wonder it will seem to be. Let it be of transpa-rent glass that you may see the water running up : fill this with boilingwater, and when it is very hot, or setting the bottom of it to the fire thatit may not presentlle wax cold ; the moutb being turned downwards thatit may touch the water, it will suck it all in. Discharging the hot wateris not mentioned, but that is of course implied, and before the vessel wasplaced on the fire—while full of hot water, it could not up any ofthe cold. (Book 19, cap. 3.). No. 186. Fludd. 4U8 Raising Wulci Jnj iJic Ehtstkitij of Steam,from Porta. [Book 1\ That the same laljorious IxpiMiiiieiiters were accjuainteJ with the proper-ty of steam to displace liquids from close vessels is equally clear. Manyof their operations made them familiar with the fact that in tliis respect itdeffects were similar to those of compressed air. Portions of their appa-ratus were admirably adapted to produce jets of water by means ofsteam—the mere opening of a cock to draw off the liquid contents of aheated alembic would often illustrate the operation, just as the overturn-ing of an eolipile, or inclining one till the orifice was covered with ^vatc^•vould do. So far as relates to the principles of raising liquids into a vacuum foi-med
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Keywords: ., bookcentury1800, bookdecade1870, bookiddescriptiveh, bookyear1876
