■rUIOONOMETKIA SFEROHUCA. 49 



<I)ii = <r = /3 .(r-F')-t-af3 .[i]-i-a/3 .[a] -+-2/3 [3] 



a.5 



-a/3' ./3 .(F-F'r.('^)^e;i2r 



Oiide posto -.— = a ; 7— « = ^ > y-^ = c ^ e mettendo ar 

 * a M da da* 



in luogo di m, ed Z'' in luogo di $', T equazione 



w = w -H i> w H — ^7-— H 7-7-^ H ■■ \ . §■ diventera 



a J i^ ii..6 d u a. 0.4 a « 



u=a7-t-/3 .(F— r')-»- 2/3^. [1] -+-2/3_^. [a] 



-t-fl/i* .(r— r')-i-aa/3 ,3j[i]H-(r— PjcojaD 



H-a?3.[3] 



a a Fa ^' ^. [i] cos a Fh-jS^ /3^ {[a] -h a (F— F'j co^F)] 



2. y/. p. I. ^ 7 



