94 A NEW METHOD OF DETERMINING 
Using these values of £ and z, and pcos @ = 4,cos*$)— p, in equation (28), we 
find 
20 20 h 
W, = —" — -heeos (y —m—o) + —*+_ -h— 2 — 1. 
” Taga, COS 7, G=a=es hqa, COS*¢, h 
Since 
k= an __ kj/ltm 
cos ¢ VP 
? 
we have from the expression of / already given, 
Fi+m) 
(amar a 
re 
di 
By means of 
h _ Gar 
~ cose ” 
we may transform the expressions 
du a 
= —.. G08 
di ® 
dr an . 
—— = é sin 
dt cos ¢ I; 
into 
r. —h=cos (f —o) .he cos (y — 2 —) + sin(f—o) .hesin (y —™— @) 
+ =sin (f —o). he cos (y —2%— 0) — cos (f —@) .he sin (y —™—«@) 
