C 33^ ) 
pare and eftimate their fpecifick Gravities , and which [ made ufe 
of to fome purpofes, for which it is nor,thac I know^as yet employ- 
ed. But afterwards confidering this little Inftrumcnc fomewbat 
more attemively, I thought the application of it might eafily be 
as 'twere inverted, and tba^, whereas *twas employed but to dis- 
cover the differing Gravities of fevera! Liquors, by its various de- 
grees of Immerfion in them, it might be employed todifcover the 
fpecifick Gravities of fevera! appended Solids, by its being more 
or lefs deprefTed by them in the fame Liquor, For 'tis clearly 
' deduciblefrom the Grounds of the Hydroftaticks, that any folid 
Body heavier than Water, loofes in the Water as much of the 
weight it had in the Air, as Water of equal bulk to the immerfed 
Solid would weigh in the Air ; and confequently, finceGold is by 
far the moft ponderous of Metals, a piece of Gold and one of equal 
weight of Copper, Bfafs, or any other Metal, being propofed, 
the Goldmuft be lefs in bulk, than the Copper orBrafs. And 
by this means ifboth of them be weighed in the Water, the Gold 
muft loofein that Liquor lefs of its former weight than the Brafs 
or Copper; becaufethe bafer metal as well as the Gold, grows 
f^h higher by the weight of a bulk of Water equal to itj and the bafer 
metal being the more voluminous , the Correfpondent Water 
muft weigh more than that which is equal to the Gold. 
ThisHydroftatical Principle may be evidently proved from 
whathasbeendemonftratcdinaikTi^^'^^w^^/W way, by the moft 
fubti le Archimedes de Injidembm humido^ and his Commentators ; 
and fhofe that are either unacquainted with, or diftruftful of fuch 
Ratiocinations, may find the Principle made out in a 
V. H^droft. Fhyfical and Experimentaf way in another Paper. 
Paradox^ Whence I concluded, that I might fafely infer, that 
the floating Inftrumenc ^ibovementioned would be 
made to fink deeper by an ounce, for inftance of Gold hanging at it 
under water, then by an ounce of Brafs or any other Metal, which 
by reafon of its greater bulk than Gold, loofing more of its weight 
by the Immerfion, muft needs retain lefs, andfo have lefs power 
•to deprefs the Inftrument 'twas faftned to. Which Conclufion, 
you will eafily believe the event did upon trial exadHy juftifie ; 
^iRdl prcfumeyou will as little doubr, that the Conclufion will 
alfo 
