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Hydraulics*

Steam) there are two Gage-Pipes at G ; one going ilittle below the Surface, of the Water when at a pr°'per Height, and the other standing a little aboveWhen every thing is right, the Stop-Cock of the shortsPipe being open’d gives only Steam, and that of thjlong one, Water; but if otherwise, both Cocks wdgive Steam when the Surface is too low, and both g> vSWater when it is too high; and hence the Cock whi^feeds the Boiler at P may be opened to such a Degreeas always to keep the Surface of Water to itsHeight.

17. The cold Water, constantly injected into st 5Cylinder to condense the Steam, is carried off by tl^Eduction-Pipe d T Y, going from the Bottom ofCylinder to the Waste Well Y, where going a list/under Water it has its End turned up, with a Valve *to keep out the Air from pressing up into the Pip e ’but permitting the injected Water coming the otb e(Way to be discharged ; whereby the Cylinder is kep fempty.

18. Lest the Steam should grow too strong for.t^

Boiler, and burst it, there is a Valve fixed at b, with/perpendicular Wire standing up from the Middle of’ 1 ’to put Weights of Lead upon, by which to exami* 1the Strength of the Steam pushing against it from wst^in. Thus the Steam is known to be as strong as th 6Air, if it will raise up so much Weight on the V^/as is at the Rate of 15 Ib. to an Inch square ; bec& uthat is the Weight of Air (nearly) on every fqu® rInch, as will be strewn in its Place. When the Ste^becomes stronger than what is required, it will listthe Valve, and go out. This Valve is called ^Puppet-Ckck. ,

19. The Steam has always a variable Strength, J. (never stronger or weaker than common Air : F° r 1has been found that the Engine will work well,there-is the Weight of 1 ib. on every square Inch ° tthe Valve L. This shews that the Steam is th est "stPart strong m than the common Air. Now asHeight of the Feeding-Pipe from the Funnel F to t ,Surface of tire Water Sr is not above 3 Feet, and