16 Mr Basset, On the Potentials of the surfaces formed by [Oct. 25, 
F=— 25s, (r); 
x ae = °K, (d) 
Eee 4r 0 1 (A) 
Lastly, consider the term Bp sin @; the surface condition is 
[ FOsooa=-=2 
Tq @Gh aN 
__ 2Beé 
+p 
=~ 2Be iL it ae (na) J, (AE) dada. 
Now we have shown that 
ee “OJ, (0) dé 
_ = =? pe ONS ea 
Kj (0) =K, (0) =20 | See 
also 6J,=S,+6I,; 
dé 
om = 22 
K. [+ 0) sear: ae 
Integrating the last term by parts, and then putting 6 =a, 
we obtain 
K,()= ={. se ae pes <a ee (38a); 
By ease te Cook ees : 
ate RIE Ne) ee (34); 
FQ) =- 22K, 0); 
r - sin 6 [* 08K, (A) 
oe [SL 0.0) T,08) dru (35) 
If the solid be moving parallel to its axis with velocity U, the 
current function 
v, 6 
a (36), 
where value of V, is given by (85). 
15. Yo find the attraction of a homogeneous cardioid of re- 
volution of wnt density. 
Let X, X’ be the x-components at an external and internal 
point respectively, then 
