Hy drostatics.

297

Solid is thus compared with Water, andconsequently with each other; as in the

Table below.

The

Canary,

*>033

Red Wine from Pcntac,

°>993

White Wine Vinegar,

1,0x1

Distilled Vinegar,

1,030

Milk of Goats,

1,009

Cow’s Milk,

1,030

Urine,

1,030

23. Since all Bodies are subject to expand

with Heat,

and be condensed with Cold, it must follow, that thespecific Gravities of Bodies cannot be precisely the sameboth in Summer and Winter. This was first observedin Experiments by M. Hotnberg, and after him by M.Eisenschmid , who found the absolute Weight of a cubicInch of several Sorts of Bodies in Summer and Win-ter were sensibly different in each other, but upon ex-amining the Numbers in his Table I find they are veryerroneous, and have left them out in this Edition, andshall only observe, that this Affair may be rendered moreapparent by taking the specific Gravities of these Liquors,(1.) when they are very cold ; (2.) when they are prettywarm ; and (3.) when they are very hot ; for in theseseveral Cafes the Subject will discover a much less Den-sity or Weight in equal Bulks, either by the Commonor Hydrostatic Balance. But there is no Method in thisCafe so accurate as examining the different Bulks andGravities of Fluids by the Divisions of Farenhcif sThermometer from the Degree of Cold in a freezingMixture , to Heat of boiling Water, and tabulating theObservations.

24. And as in this, and many other Cafes, it is re-quired to be very exact in weighing Bodies, even be-yond what is attainable by the nicest Mechanism ofthe Instrument itself, I shall here give the Reader an Ac-count of an Improvement of the Common Balance inthis Respect, from the late learned S’ Gravesande ; and, 4 it