r.„ ,. CQ. (aa—b b^d n.^^cof.^t) 



jiii. w — ^^ — ■^(a*coJ.(jr^b*Sin.<P^)i 



vnde porro fiet 



-„r ,, . a a eo r. (p» -4- 5 ^ J?n. O » 



V.U1. u; ^ ^^, ^^,-_ (jjj _^ j,j.,^_ ^ij j 



confequenter 



taug. OJ oocq/. a.'H-66/in.<JJ»* 



§. 8. Quia angiiliis A N L = Cf) cxprlmit ampH- 



tndinem arcns A L, inuelligemus quoque curuaturam in 



ipfo pun(fio L, fiue radium ofculi, quippe cui proportio- 



nales erunt gradus laciuidinis in quolibet Meridiano A LB. 



Hunc in fincm vocemus arcum A L — j-, et conftat radi- 



um ofculi in L elTe — ^; quarc ad elementum ds in- 



veniendnm qnaeramus diffcrentialia dx et dy, quae repc- 



riuiitur: 



, - a a b b d(^f\n.0' 

 ax^ ■ et 



dj- 



{a a cof (^' -^bb fin. (^J 

 aab b d(pcoL(p 



I » 



{a a cof. (p' -{- b b Cm. (l^^y 

 vndc colHgitur ipfum curuae elemcntum </j, fiuc ipfe ra- 

 dius ofculi 



d s o tt h b 



"^^ [a a cof (^'-\-bb fm. (|)^)' 



hb 



€x quo fequitur, in aequatore eflie radium ofculi — t> 

 fub iplo autem polo — ~. 



§. 9. Transferamus nnnc haec ad vcram Tcrrae 

 figuram, qua ell b^'. a-z. 2.00 : 201 ^ -vndc fumto femiaxe 



Hh ^ CB 



