AND ITS APPLICATION TO MR. B. TOWER’S EXPERIMENTS. 
193 
Fig. 17. 
Then taking x for distances measured in the direction OA from O on the surface 
AB, and putting r for the distance of any point from J 
(40) 
x 1 =R ^) 1 
—2 
Neglecting quantities of the order 
h—a{l-\-c sin (#—</> 0 )} 
(41) 
(42) 
For if I be moved up to J, Q moves through a distance ca in the direction JIT. 
The boundary conditions are such that 
(1) all quantities are independent of z 
(2) U 0 is constant. Uj and V 1 =0 
(3) putting d 0 =OJA, whence by symmetry O o ——0 1 
e=e 0 \ 
p = p » 
2 c 
(43) 
MDCCCLXXXYT. 
