Hydraulics.ticular Place, by means of the Ball and

docket (LXXIX.)

There

Jot Sun Of a Summer’s Day, the Air will he rarified! y the Heat of the Sun in the upper Part, and willcompress the subjacent Water, and force it up throughValve G into the Tube GH, and by the Cold ofthe following Night it will be condensed again, ande n the Preilureof the Atmosphere will force the Wh-et at W up the Pipe W I, to replenish the Vessel eacha y,‘ And in this Manner may Water be raised in aconsiderable Quantity in the Summer Time, or in veryhot Climes.

By such a Contrivance as this, several curiousnects may he produced. Thus if a cylindric Coverc annexed to the top Part of such a Vessel (divested0 bs Tubes,) it may be raised to collect the Sun-Beamsat Noon on the Top of the Vessel, which will sogreatly rarity the Air within, as to make it produce aConsiderable Stream of Water through a small Adjutageln the Side thereof; which Stream may fall on a Wheelto play an Organ at Dinner, A c . Thus also, an^ a gc may be made to weep in the Sun-Beams, or atKi ^ pproac ’ n ok Fire; with other Devices of the like

. (LXXIX.) The greatest Artifice of Fig^*

Us Contrivance to produce a . - Air in the

'» done by Compression, and Elasticity of Air m ^

B wrel, called the Air Vessel o b ed 1 £ in

"tg an elastic Fluid, will be capable of Con£ ValveSany Degrees by the Water forced mthrou b ^

« b K; and since the Force of the An &

always be inversely as the Space whic. P ^

(as will be shewn) it follows, that w.ien - ^

M is half full with Water, the Air will be com?*into half the Space it possefs’d at first, and tnereto ,

Spring will he twice as great as at firsts posture

2. But this Spring at first was equal to the r -of the Atmosphere; for st st was not. It LtmofphervVve fustain’d or resisted the Pressure of th which

F i