- 23 
M •'' M l /ì — T — / 
I M,2Mj' I ^, /ITT 
sen i, (P 2^) — - (2^) 
+ -^^-f- I (1 - cos ^. (P 2^) - y^l^-^ sen (2^ j 
e pel valore della , posto 
N2 = (l-e,) cos U-T 
M 
(10) 
+y (1-^2) cos ^f^jp) 
+ 
1.1 
(1 - e,) cos (1' 2') - ^ i±l^- sen -^^ (1') | 
+ j (1 - e,) cos (2=^) - 2 
sen (21)- - u-T 
+ 37(1-^2) cos^,(P) 
+ ~2Tl^ i - ^-^^ 2') - y/ iXfL sen (P) 
^ -1:2^ ì (1 - (l'2^) - 2 sen -^^ (1> 2') 
(1-^2)^ 
(1') 
