The First Steam-Boat

C 18 ? Gallon. This Veffel being fill’d, the, Hottom will he allow'd to fuftain the, 'whole Weight of the Fluid therein contain'd, Gravity a Sing in aright Line and F er pen- dicularly. .dgain, take another Vejfel of equal Height and Baft partly Cylindrical and partly Flanch’d out, the Top being in the form of the, fruftrum Of a Cone, This Veffel fiffofc will hold two Gallons '• Then, take a third Ftffel of equal Bafe and but half the Height-, to malte it, however of equal Het ght niith the other two, let a. final I lipe be folder’d into the Lid. Let this Veffel contain in the whole, but half a Gallon. ft thefe be feverally fill’d -with a Fluid of the fame Find, we fay that the Bottoms and Sides of each of thefe fhall be freffedthereby alike. If the Cylin- drical part of our fécond Veffel mentioned "were continued to the Top, the Fluid thereby inclofed uoou’d be juft in the fame Ctrcum- ftancts as that in theVeffelfirft mention’d-, and then the Side Water contained in the conical Fart would bear a gain.ft the Cy- linder, fuppofed to be continued to the Top, aS if the Water therein wasFroseen, on the one Hand, and bearing againft the Sides of the conical Fart on the oiber, according to the Height of the Fluid between them ton-.