The First Steam-Boat

Theor-em. V. « Solid Magnitudes lighter than the * Liquid, being thruft intothe W’“* «■ are reoulfed upwards Wrth a force as ce Sat o the excels of the Gravity o£ “ f Mafs of Liquor, equal to the Ttfafe- ^nitude above the Gravity of the laui C« Magnitude. Theorem. VI. » Solid Mag,nitu<tes Heavier than the tc Liquid, being demirted into the lettkd a Liquid, are born downwards as far «r as thev can åeicend, ancllhall be Li&h' « ter in the Liquid )>y the Gravity of « a Liquid Ws ofthe fa,ne bi&neßwtth n the foliå Magnitude. Here follow fime other TiiEOKEMS, con- cerning fatter. Theorem. I. » If four pieces of Mettais whereof a the third is of the fameKind with the « ftrft, and the fourth of the fame Kind with the fécond, are?wpovt‘Cnal, their « Gravities or weights Ihall be ?vopor- tional. TheoR-