== (140) = 



piincfta in Jinca P /), qiioriim dilhmria a ccnrro —a; iit adeo 

 corrcciio liinc oriunda pro on nibiis Mciidianis fir cadcni , 

 ncinpc — jfo , vel circitcr l lincac duodcc. fi a uni pcdi ac- 

 quctur. 



Cb cxiiriHim diflTcrcntiac huiiis valorcm conflruL^io mnp- 

 pae fic potcrit abfoJvi. Dcfcripta cliiprc hori/ontis P M /j /// , 

 pro Mcridiano , cuius Joi^.^itudo m a , ducatur circulus pcr 

 punc^ta P, A,/); qucm in fincm tantum opus clt ciusdem ccn- 

 trum invcnirc , quod fit in pundo .v; atquc pofito C .v :::=: .v, 

 cfie dcbet x p - x A, idcoquc C p" -h .v jr - ( A C -h .v;", h. c. 



a a (fcc. a — tang. a/ -\- i a x (fcc. a — tang. a) 

 — bb—^" (fcc."- a — tang." a) , 



ct divifionc pcr « (fcc. a — tang. a) inftituta fict 



X z^ "- (tang. a (m in -\- i) — fec. a{m m — i)). , 

 Vbl fi fubftituere velimus w w =r i -f- :: |jl, habcbimus 



.. o m /cg. -j. — K/PC. o ) 



A -^— ^^^-^^— — — — —~^—~ . 



m m 



Rcpcrto fic ccntro .V, circulns dcfcribi potcft radio .v /), ncqtic 

 opus cft quacrcrc puncfta A. Quia vcro pundum C datuin 

 cll , atquc cxacfiitudinis caula pracllct , punda A dcrcrminarc , 

 fcu lincam M /// di\idcrc, x mcJius invcnitur pcr hauc acqua- 

 tioncm : .v zzz ti* "*"* ' . 



§. II. l'roicaio Parallcli cft coni, culus bafis crt circii- 

 Itis, intcrreclio cnin plano in ccn.ro ba^cos iiuic norn ahrcr iiilillcn-" 

 ti, quod Fig. 6. clarius ob oculos ponit, ubi parallclu>« L / cU bafis 

 Tal). I. coni 1. O / , cuius intcrfccffio cuin plano labujac XX cll pro- 

 ^*)i- 1 icjfiio quacfita. Kcpraclcntct itaquc lig. 7. conum L () /, cuius 

 bafis ]. l per ccntrum K normali^^cr lccctur plano X Q X'. M- 

 tcrat hic idcm dcnotant ac in figura /f.v/tf. Per punifia L, (),/ 



pu- 



