Hydraulics.
the Steam-Cock or Regulator E io, stopping or open"ing the Passage, to prevent or permit the Steam to pa*" 5into the Cylinder, as Occasion requires. The Diam e 'ter of the ripe D is about 4 Inches.
9. The Steam in the Boiler ought always to be alittle stronger than the Air, that, when let into th®Barrel, it may be a little more than a Balance, to th®Pressure of the external Air, which keeps down itsPiston at the Bottom dn. The Piston being by th* 5means at Liberty, the Pump-Rod will, by its gt ei,tWeight, descend at the opposite End to fetch a Strok® ■For the Weight of 70 or 80 Yards of Iron-Rod amount*to about 9 or 10 Hundred ; whereas the Piston,other Weights at the other End, js not above 4 or 4 *Hundred. The End of the Lever at the Pump ther®'fore will always preponderate the other, and descen®when the Piston is at Liberty.
10. The Handle of the Steam-Cock E 10 beingturned towards », opens the Pipe D to let in the Steam*and being turned towards O, it shuts it off, that n®more can enter. The Piston is now raised towards tb®Top of the Barrel at C, and the Barrel is full of Steam-The Lever O 1 must then be lifted up, to turn by i tS
Teeth stie Injecting-Cock at N, which permits
tb®
Water brought from the Cistern £, by the Pipe gto enter the Bottom of the Barrel at n, where it fliesin the Form of a Fountain, and striking against £ b®Bottom of the Piston, the Drops being driven all oV csthe Cylinder will by their Coldness condense the St ea,1 |into Water again, and precipitate it to the Bottom 0the Barrel.
II. Mr. Hen. Brighton made an Experiment to d®'termine the Rarity of the Steam, and found the Comtent of the Barrel of Steam was 113 Gallons; aJldsince there were 16 Strokes in a Minute, therefore l J ?X'i6=a 1808 Gallons of Steam per Minute. Pie. observed, that the Boiler required to be supplied wm’Water at the Rate of 5 Pints per Minute; and sincecubic Inches make a Gallon, 35 p make a Pint, and j' 1 '35 + = in 5 Pints; also the cubic Inches ofare 1808 X 282 — 509856 ; if then we fay, As i? 6 */
509^?