§6 Hydraulics,

■but great Care must then be taken about it, lest theSteam, so very strong, burst the Boiler to Pieces.

5. The Steam is carried from the Boiler to a Cop-per Vessel A by means of the Pipe CD, and is let intothe fame by turning the Handle K of the Steam-CockD I. The Key of this Cock is kept down by the Scre«rL, held up by the Gibbet D L. The Handle turn’dfrom K to k admits a Passage to the Steam into the Cop?per Receiver A.

6. The Receiver A communicates at Bottom withthe Sucking-Pipe Z H going down to the Water H iffthe Well X; and above wjth the ForCing-Pipe E E?which goes up a little above the Water of the ReservoirR ; between these two Pipes are two Valves F and G»both opening upwards. The Steam being let in uponthe Water of the Receiver A, forces it up through theValve F, and the Pipe EE to the Reservoir, and thenthe said Receiver is full of hot Steam.

7. This Steam in the Receiver is condensed by a J ctof cold Water coming from the Forcing-Pipe by thesmall Pipe M I, being let in, and shut off by the Cockat AL The Steam being condensed by this Jet, wiHbe reduced within a very small Space, and so make a V#'cuum, upon which the Water in the Well will rush upthe Forcing Pipe to restore the Equilibrium, and thusagain fill the Receiver A ; the little Air being corN"press’d within a small Compass at the Top above ab-

8. That there may always be Water in the Force-Pipe for the Jet, there is a little Pipe which brings theWater to it from the Reservoir, with the small Stop-Cock Y to shut it off upon Occasion. The Valves atF and G are, examined at any time, by unscrewing th 6Pin 1'to loosen the Strap 2, and let down the Flancfy3, all which Parts are strewn larger in the Figures be-low.

9. By the peculiar Contrivance of the Cock at D ^

and its Key, the Water is made to pass from tb cForce-Pipe to the Boiler, to supply the Waste in StealthThis is plainly shewn in the Sections of the Cock aim

slate Key, where 5 is the Top of the Key ; 6 is a Hole oft

XXV. one Side, which goes down to the Bottom, to convey

Fig. 2. the Steam or Jet of Water alternately to the Receiver *

' -. ' y )S