148 DE CALCVLO MOTVS 



vndc ftatim collii^itiir : 



</xcor.o+^Yrin.e— rt'r(cor.crcor.(e-v|^)+rin.(7cor.urin;e-v|,') 



— i-Y/^(rin.a-cor(^-v{^)-cor.G-cor.ojrin (0— vl>')) 



ad qiuim formam magis contrahcndam obfcrno in 

 Fig. 2. fig. z. \bi NS-0-v|^; NZro- SNZi^w ctSZr{x 

 fore primo vt fnpra cofo-cof. (0 — vjy^-f-fin.c^coroorHi. 

 ( — vjy ) rr cof (JL , dcindc vcro fi ponatnr angnlus 

 NZS— ^, reperiri 



y Jin. <T cof.;d — yj/] — cof. g cof.ai f in. 'j — 4») 



COt. i; . J;a. ujjV«. i^ — v|/) 



vndc concluditur : 



fm.o-cof (0-v|.)-cof.(7conco fm. - v{.)r=:^^^%'j^'^ 



r= fiii.jxcol ^ 



ob fin. ^ : fm.(i? — 4^) ~fin. oj : lin. jji.. Ex his cri^o 

 impctramus 



(IXcoC. e -\- dY fm. — ^'-jcof [JL — ^' ^Cp fin. jx cof ^. 



Vcl fi in Z ad arcum NZ alinm arcum normalcm 

 ducamus in eumquc ex S pcrpcndicuhim in fiipcr- 

 ficic Iphacrica dcmittamus , quod voccinus zz^v crit 

 fin. V — fin \x cof ^ (cu 



fin.o-cof (0 — v|^) — cof (T cof (j fin.(0 — v|^) — fin. v 



ncquatio primam dctcrminationcm LOULincns ita fc 

 habcbit 



-^'r/Cpfm.v)(^,-j^)). 

 XVIIL 



