Hydrostatics.

289

Scale to which the Body is appended.These Weights will severally express the

Gravities

will subside and stand at the Altitude G I in the Tube.Now since this Column of Oil is balanced or sustainedby a Column of Water of an equal Base and AltitudeC F, and the Densities of Fluids are reciprocally as theBulks, the specific Gravities (which are as the Den-sities) will be as the Bulks, that is, the Altitudes re-ciprocally, (because the Quantity of Matter is the samein both) therefore if G iz=ioo, and C F—87, thespecific Gravity of the Oil will be to that of the Wa-ter, as 87 to roo, or that of the Water to that of theOil, as 1,000 to 0,87.

13. In like Manner, if A B C D be a long Tubewith a little Mercury poured in to a small Height b c,and then a small Tube a e, open at both Ends, be putinto it ; and lastly, if Water be poured into the largeTube upon the Mercury to the Height of 14 Inches,it will by its Pressure raise the Mercury to the Height bof one Inch in the small Tube above the Surface ofthat in the large one ; which shews that the specificGravity of Mercury is to that of Water nearly as 14to 1. As will appear by the Experiment if accuratelymade.

14. Once more ; another Way, which in someCafes may do very well, to find the specific Gravities ofany different Liquids, is by Means of a recurved TubeA D G, in which if Quicksilver be poured first to fillthe Bottom Part, and then one Liquid into one Leg,and another Liquid into the other Leg, in such Man-ner that they press on the Quicksilver on each Sideequally, which will appear by the Surface on each Sidebeing ut the fame horizontal Line C E ; then will thespecific Gravity of the Liquid in the Leg A C be tothat in the Leg E G, as the Altitude of the latter E Fto the Altitude of the former C B,

15. By the Table of specific Gravities it appears thatGold is the heaviest Body in Nature, and that Mer-cury is next to it in Gravity; and conlequently Gold

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