( 98 )

Pump, is either the Sucker, which > * ^fences the water in the Pump from the ^preflure of the External aire, or that ^pressure it self. And therefore, all * t [that the drawing up of the Sucker needs j s

to do, is, to free the water in the Pipe otfrom the impediment to its Ascent, c jwhich was given it by the Suckers .lean- te

ing on it, or the pillar of the Atmo- assphæres being incumbent on it;as in ourExperiment, the sides of the pipe do wsufficiently protect the water in the u ,pipe from any pressure of the Exter-nal oyle, that may oppose its ascent. ^And lastly , as the water in our p[pipe was impell’d up so high, and no ^higher, that the Cylinder of water in p,the pipe was just able to ballance the mpressure of the water and oyle without wthe pipe; so in Pumps, the water does fyrile but to a certain height, as about f c33 or 34 foot: and though you pump ) y (never so long, it will be rais’d no n

higher; 1