80 Hydraulic Sj

Air will therefore fall through the Steam to the Bot-tom, and from thence be driven out through a smallPipe opening into the Cup at 4, on which is a Valv^'Now when the Steam first rushes into the Cylinderand is a little stronger than the outward Air, it Wd*force the precipitated Air to open the Valve at band make its Escape; but the Steam cannot folloW?because it is weaker than the outward Air, as th®Piston gives it room, by ascending, to expand. Th )SValve (from the Noise it makes) is call’d the SniftitttClack.

22. Among the greatest Improvements of this Essgine, we may reckon that Contrivance, by which th®Engine itself is made to open and shut the Regulator at 1Injection-Cock, and that more nicely than any Perst^attending could possibly do it. For this Purpose th esCis fixed to an Arch Z, at a proper Distance from th®Arch P, a Chain, from which hangs a perpendicul asPiece or working Beam Q_Q_, which comes do^quite to the Floor, and goes through it in a Hwhich it very exactly fits. This Piece has a long ^in it, and several Pin-Holes, and Pins, for the Mo v ®ment of several small Levers destined to the said Off cof opening and shutting the Cocks, after the followerManner.

23* Between two perpendicular Pieces of Wood 0each Side P, there is a square Iron Axis ABfollowing Fig. where this Part is represented by J 1 * }for Distinctness)'which has upon it several Iron Ps®E>of the Lever Kind. The first is the Piece C Ecalled the Y, from its representing that Letter inv' e f £6 ?by its two Shanks E and D ; on the upper Part > sWeight F to be raised higher or lower, and fixed:Occasion requires. This Y is fixed very fast uponlaid Iron Axle A B.

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24. From the Axle hangs a Sort of an Iron fitM ^I K L I, by its two Hooks 11, and having on the 1 °^' *Part two Holes K, L, through which passes a long * r tPin LK, and key’d in the fame. When this Pin EPj;in, it is also pafs’d through the two Holes in thess 11 ^E, N, of the horizontal Fork or Spanner E QN, j 01 ^