20 O R I A N I 



jMa si sono gia trovati sopra (§ yS) i valori di 



d.cosp' ^1.\l^ ■ , 



— , , —~ ', SI avra pertanto 



(<^-)=-^^«'ca.;y^£!!^((P-[,]r 



sen II 



(^— [ • ]) fai'— [ I ] — J5" ^'^a"g f^-<-5c« ^''^^ng P j 



e r equazione K=II 



_jj frr i'^'ny 



sen J I 2. sen II 



diventera 



^ = //-^^ 



A' a 



a' sen H 



c..;,''(P_[,])_^._|^co.//^(,4P_,6[0-H[a]) 



^ cos p'^{P -[,])'[ 



d" cot H 



sen H sen 



II \ 



y ^ j en2y^cosp'''cotII[P—[ t ])[ 2.P—[i]—senVHangV-^senF'^tangV'\ 



Tvr^ ^ , dll „ cldH . . a . 



J^^T^ "^ 7;;rZF~ = - ^ ' dunque avremo 



'i^ 



K=^^I—-,'^cosp'\P—[x])^^Acosp"{i^P—i(>U]-^[o.]) 

 a a' 



-t-^.i?co.y/^(P-[,])^ 



A* r il 



— -^ .A'senp'^cosp'^^cot JI .{P—[i])\ aP— [i]— sen V^ tang V-^- sen F'* tang V'i ] 



Colle formole precedenti (§ 7 3) si calcoleranno le quan- 



1 



