224 
Velocities of Rim in feet per Index of the Power of 
second between which the Velocity which 
Fluid. the Experiments were is proportional to 
made. the Resistance. 
( ' 7 
and 5-36 
•64 
Air 
5-36 
„ 13-2 
•98 
( 13-2 
„ 23-03 ... 
1-7 
f -47 
„ 5-2 
1-084 
Water 
■■{ 5-2 
„ 13*44 ... 
1-78 
Oil 
•19 
t— > 
00 
1-24 
I infer from tlie above that in the circumstances of my 
experiments the resistance of liquids up to five feet per 
second is nearly in the simple proportion of the velocity. 
The following are my results as to the resistance due to a 
given velocity 
Pressure on Rim Velocity of 
Fluid. 
in grains. 
Rim. 
Air 
853 
23 
Water 
6267 
13-44 
Oil 
6715 
1-79 
When the liquids were exposed to three atmospheres’ 
pressure, the resistance appeared to be slightly increased. 
I hope to clear up this and other points, and to obtain more 
exact results, when the apparatus shall have received the 
improvements which have suggested themselves in the 
course of this preliminary enquiry. 
{ 
