124 On Specific Gravity- 
often this weight is contained in the weight of the stopple, te 
ascertain the specific gravity. 
To ascertain the specific gravity of a body lighter than water. 
Let a small glass funnel be suspended from 
a scale beam, and counterpoised so as to be 
just below the surface of some water in a vase, 
as in this diagram 
while — situated, a bers lighter than 
water, a sm r instance, be thrown up 
under the foasel the equilibrium will be sub- 
verted. Ascertain how much weight will coun- 
teract me poayas ney of the cork, add this to its 
weight, and divide its weight by the sum—the 
fitted is = the aswer. 
Rationale. 
The force with which the cork rises against the funnel, is 
equal to the difference between its weight and the weight of 
the bulk of water which it displaces. Of course, ascertaining 
the force with which it rises, by using just weight enough to 
counteract it, and adding this weight so ascertained, to that 
of t plas sone ase bulk of water, equal to 
praeneitacl e dre y this, dividing the weight of the 
cork, agreeably to t the specific gravi 
the cork will be found. gore x: ate 
To ascertain the specific gravity of a Liguidi 
Let the stopple be counterpoised, exactly as in the last ex- 
periment, excepting that it is unnecessary to take any ac- 
count of the speammspoising weight. 
Having, in , ascertained how much weight will 
sink it m the ay divide this by the weight required to 
sink it in water, as above. he quotient will be the specific 
gravity sought. 
Rationale. 
It has been proved, that the resistance to the sinking of 4 
Siena any fluid, is Liga yy equal to the ype of a bulk 
d, equal to the balk of the body. Ascertaining the 
