122 On Specific Gravity. 
tal Demonstration, that the —— which a 
encounters, in sinking into any fluid, is just equiva- 
y 
lent to the weight of a portion of the fluid, “equalling the 
body in bulk. 
This proposition may be experimentally* demonstrated, by 
means of the "BRP SPAD represented by the following figure. 
‘The cylinder, ncareates as surround- 
_ ed by the water of the vase, (V) is made 
to fit the cavity of the cylinder suspended 
over it so exactly, as that it enters the 
__ cylinder with difficulty, on account of the 
included air, which can only be made to 
pass by it slowly. _ It must, therefore; be 
evident, that the cavity of the hollow cyl- 
inder, is just equal in bulk to the. solid 
cylinder, which so exactly fits it. 
Both cylinders, (suspended as seen in 
the plate) being enupterpaised = a ia 
- upon a scale beam ; let a vessel of water 
be placed in the situation of the vase, in 
the drawing. It must be evident, that the 
equiponderancy will be d estroyed, since 
the solid cylinder will be oueTe ed up by 
4 = eas =< * the same. manent when the cavity be- 
mes full, the equiponderancy is restor- 
ed a and the solid epiudes pe pss below the surface of the 
= therefore a appears, ‘that the resistance which the solid 
cylinder encounters, in sinking in the water, is overcome by 
+ weight of a quantity of the water equal to it in bulk. It 
must be evident, that the same would be true of any other 
body, and of any other fluid 
Rationale. 
When a solid body is intreduced into.an inelastic sdlid, on 
ee it, a hole i is Jett, which remains vacant of tlie 
