De Machina Hstdravl. Londinensi. gi

Steam of it being ; quite confined, must needs bewonderfully comprdTed, and therefore will, on theopening of a way for it to issue out, (which is doneby turning Z the Handle of the regulator from you)rush with a great Force thro the Steam Pipe Oi, intothe Receiver Pi, driving all the Air before it, and for-cing it up into the Force Pipe, through the Clack Ri,as you will perceiue by the Noife and Ratling of theClack 5 And when ali the Air is thus driven out, theReceiver Pi, will be very much heated, by the Steam.when you find, that it is throughly emptied, and isgrown very hot, as you may both fee and feel, thenpull the handle of the regulator towardsyou, by whichmeans you will stop the steam Pipe Oi, so that no mo-re Steam can yet come into it, put you will open it away into O2, and by that means fili the Receiver P 2,with the Steam, as the other was before. While thisis doing, let forne cold Water be poured on the Re-ceiver Pi, by which means the Steam there being coo-led, and Condensed , and contracted into a very littisroom, and consequently presling, but very little, (if atali) on the Value 'or Clack Ri, at the bottom oftheReceiver Pi, There is nothing there to Countrebal-lance, the pressure of the Atmosphere, on the surfaceof the Water in the lower Part, of the Suking PipeT;where fore it will be.jprested up, and afcend into ancifili the Receiver P 1, driving out before it as.it raises,the Clack or Valve Rj, which afterwards fallingdownagain and flmtting dose hinders thedefcent of the wa-ter that way. Then ( the Receiver P2, being in themean time emptied of its Air) turn the handle of theRegulator from you, and the, Force of the Steam co-

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