of Bodies moving in Fluids. 7 
ing with the same velocity in water :: 0,0354 : 0,07998 :: 1 : 
2,23. 
We proceed next to compare the actual resistance of a globe 
with the resistance assumed in our theory. In the first place, 
the absolute quantity of resistance has been found to be greater 
than that which we use in theory, in the ratio of 0,2321 : 0,1598; 
but, by theory, the resistance of the globe : the resistance of 
the cylinder :: 1:2, or as 1,115 : 2,23; hence, by theory, 
we make the resistance of the globe too great, in the ratio of 
1,115 : 1 5 an d it is too small, from the former consideration, 
in the ratio of 0,1598 : 0,2321; therefore the actual resistance 
of the globe : the resistance in theory :: 0,2321 : 0,1598 x 
1,115 0,2321 : 0,1782, which is nearly in the ratio of 4 : 3. 
Thus far we have considered the resistance of bodies moving 
in a fluid , we come next to consider the action of a fluid in 
motion upon a body at rest. 
A vessel 5 feet high was filled with a fluid, which could be 
discharged by a stop-cock, in a direction parallel to the horizon. 
The cock being opened, the curve which the stream described 
was marked out upon a plane set perpendicular to the horizon; 
and, by examining this curve, it was found to be a very accu- 
rate parabola, the abscissa of which was 13,85 in. and the ordi- 
nate was 50 in. hence, the latus rectum was 180,5 in. one-fourth 
of which is 45,1 in. which is the space through which a body 
must fall to acquire the velocity of projection ; hence, that ve- 
locity was 189,6’ in. in a second. And here, by the by, we 
may take notice of a remarkable circumstance. The depth of 
the cock below the surface of the fluid was 45,1 in. hence, the 
velocity of projection was that which a body acquires in falling 
through a space equal to the whole depth of the fluid ; whereas. 
