24- J3E CVRVA QVAPAM 



Iam liinc difFerentiando clicimus : 



atque vlterius differentiando 



^-^4-vP)(P-4-qtt-R^ + S^-Tw 4 -Hetc.) 2 



-r-(? + ^)(Q-*Rw + 3Soi*-4-Tci) s -+-etc) 



£$= 3 fa-M') (q-2 Rw-HjSu'-* Tu 5 -f-etc.) (P-4-Qu 



— Raj 2 -|-Sa) 3 — etc.) 



-H?-H;)(P-hQw-RwH-Stt 5 -Tw + -h etc.) s 

 — (^-4-\p)(2R— fiSu-Hi^Tu*— etc ). 



His expeditis pro curuae pun&o , quod conuenit ab- 

 fcifiae $gzp-±-t- et applicatae y — q-\-\\f dire&io 

 tangentis ita le habebit vt fit 



tang. $ =2-t - (q -+- 40 (P-r-Qu-RwM-Su 3 -TuM- etc). 



Tum vero pofito radio curuaturae — :r 9 nouimus 

 fore 



*• — r T _U^f : — * — t • d -^-rnf rtV 



r. — U-t-dw*/ dw 2 — ■* • dco^ coi. q; 



feu £ — j^r cof. $* , vnde pro variabilitate curua- 

 turae elicimus : 



-r^r.-w cof. <p - ^*. $2 fin. <p cof. (J>>. 



Eft vero ^7^2 n -^- vnde conficitur : 



-r4k = ^cof. $• - 3 (nf/ fm. $ cof <&\ 



Quae- 



