167 
2 
b the other axis of the ellipse, and e? = — also f equal 
the height of the cylinder, then the resistance on the whole 
surface 
1—é’ 1 , 
ee 2 ne tee 
=2pu'fd. 2 ioe é 1, 
Kx. 6. To find the resistance experienced by a right cone 
moving in the direction of its axis with either the apex or 
the base first. 
Let a be the height and b the radius of the base of the 
cone, then the resistance on both surfaces 
1 b® 
= 3 mpv b" aap + 1} 5 
which diminishes as a increases, and becomes 7, 
mpv'b’ when 
a=b, which is the same as for the hemisphere. 
Ex. 7. ‘To find the resistance experienced by a double cone 
moving in the direction of its axis in a fluid. 
Let a be the height of each of the cones, b the radius of 
their common base. 
4 
a? + BP 
the sphere when a = b and 6 is the radius of the sphere. 
Experiments were described which verify the results of the 
front and back resistances being nearly equal, and show the 
effect of different forms of bodies moving round an axis in 
water. 
Then the resistance = zpv”. This is the same as for 
March 21, 1870. 
The President (Professor CAYLEY) in the Chair. 
New Fellows elected : 
R. PENDLEBURY, B.A., St John’s. 
KE. F. Epwarpsgs, B.A., Trinity. 
The Treasurer (Dr CAMPION) presented his accounts, and 
