The First Steam-Boat

C ^9 } TheDennties o-fLîquids are ahocom- pared together by immerfing a loh dm them-, for if a (olid Lighter than the Li- quids to be compared together be im- merfed fuccelfively into Mterent Liquids, the immerfeJ will be itwerleVy a.s rhe Denfities of the Liquids: for, becaule the fame folid is made ofc of, thePornons o£the different Liquors, which in every cafe would HU the Space taken up by the immerftd part, are of the fame weight -, therefore the Bulks of thofe Portions, that is the imrnerfed partsthemfelves aïe inveriely as the Deniities. Six Theorems extracted des’s Trådt, entitled De lncidentibi’3 Aquæ, very ttecejfiry for the better Un- derfanding of few rat Experiments and Conclufions herein contained. Theorem. 1. « The Superficies of every Liquid that <e is confiiïcnt and løttled fhall be ot a “ fphen'cal figure, which figure fhall have ef thefame Center with that of the Globe 4t" pf the whole Earth and Waters, Q £ hi o k