§. 2 1. Erat aiitem i=i— — — — , ideoqiie z nu- 

 merus negatiuus. Pouarnus igitur i ~ — c c et habebimus 



^ -— _C_ _] C^ r d t ^ f d t 



c ( ~^ c e J (t t - cc)^ c* J t I — c c" 



?onamusporro/(-yy^,-,r=,-^^-4-/^-ilI-, eritque difFe- 

 rentiando et pcr (f t diuidendo 



I a 1 a.t1 1 e 



W- 



(f( — cc)^ ' f( — cc (ff — cc)' ' tt — cc' 



vndc collisiimus a — § ~ —--'-, ita vt nunc fit 



V — 



1 cc 



C C t 3_C r d t 



c*t 7C*\tt — cc) 2i:*J tt— cc' 



Eft vero 



r dt r dt I /c_rtJ 



J tt — ce J cc^tt ~~ =c^c— t 



confequenter 



V — — 



C C t , j C /c + f 



; i_ijc ic_+j 



tt) '^ 4Ci C-( » 



C« t 2C*[CC- 



vel, pofito breuitatis gratia C—~Dc^, fiet 



'^ t ^ 2{CC~tt) ♦ ^CT-t^^' 



§. 23. Inuento hoc valore erit angulus nofter 

 y\ — Dc-\- -.-^'ttv -lDtr-±-l-\-E t, 



' ' 2{CC — (f) * c— t ' 



vbi notetur effe <; f — — i — -H ^'' . Pofito igitur ? r^ o 

 fiet -Yi — Dcj ficque Dc exprimit incUnationem initialem. 

 Hinc crefcente t hoc pendulum M A afccndet, et angulus 

 etiam crefcit , nifi forte conftaus D fuerit negatiua ^ ve- 

 rum tempus t non vltra c augeri poteft, quia alioquin ex- 

 preflio pro vj adeo in infinitum excrefceret. Quod quo 

 clarius appareat , confideremus etiam celeritatem angula- 

 '^^ Vt^R^T?~l D/H^;- ^ c^-+-E. Nunc igi- 

 tur ponamus initio , quo / — o , fuiffe vj — a et ^^ — o , 



erit- 



