rig- 5- 



== (138) == 



pcrboliiin abirc poHc, quia nequc flcri porcfl: h~a^ ncquc hb 

 nc^uti\um uancifci potclt valorcin. 



Si in phino pioic<fiionis A Q /7 pcr pu:i(num C duca- 

 tur pcrpcndicularii ad axcm A ^/, ca paritcr ad Mw ("cu dia- 

 metrum Acquatoris crit normalis, idcoquc cum nxc V p coiii- 

 cidet ^ Fig. 2.). Ergo abfciirac in: A C relpondcrc dcbct ap- 

 plicata ~ ^. Idcm fcquitur cx acquatione piiorc §. 7. ubi fi 

 lublticuatur / ~ A C ^i: fl ( Ibc. a — tang. aj, habcbiir.us 



II U := 'K'K(fc.* T — fong « T t aa ^ ^^ 



Bifcdo autcm axc A a \\\ a, crit Ca — a — ACrzfl tang. a, 

 qua acquationc rcpcritur diltantia ccntri Mcridiani a ctiitio 

 mappac. 



§. 9. His pracmifTis conftruiftio Mcridianorum nullam 

 movcbit dirtkultatcm. Ducatur nempe rcfta 



in ciusquc mcdio C crigatur pcrpcndicularis indcflnita Q<7,' 

 fiat C M zn C w 1=1 fl , ct (iipcr fcn.iaxibus a ct h dcCcnbatur 

 cllipfis PMp;//. Quo fado crunt P, />, poli, cllipfis P M /> w 

 Mcridianus primus lcu horizontis, rcfta P /) Mcridianus pc " .1 

 primo diltans, ct rccfta M m Acquator. Cum omncs Mcridia- 

 ui tranfcant pcr poU)s P, /), ct quodpiam pun(ftum A Acqiia- 

 toris , divifio Acquatoris fcu dcterminatio puntftorum A pro- 

 iC(ftioncs Mcridianorum fimul dctcrminar. Pio quo\is itaquc 

 Alcridiano , «lui a \cl iso — a gradus a priii o dillar , ca- 

 piatur C fl ~: C /> rr fl f:'"g- « •> ct fl A ~ /* H — a Jcc. a , 

 atqnc pcr piin<fta a ci h diicaniur n^rmaics a a'' ct (3 f^'' , 

 tumqiic fiat a a — a x ~ h [/ ~ h (l — h lcc. a , vcl ruma- 

 tnr ;;/ : I — j A : <7 a, ctc. Si iam pcr ptni(fa A, ' ', «, 

 dclcribaiur clhpfi> , aut laJicm illa cliipfcos pars , quac cadit 



iutra 



