<*•*§ ) 137 ( ***■ 



§. 10. Quod fi ergo hic ponamusi' — o, locus poli II 

 ia proicvtione prodirc debct; tum antem rcperietur 



.v 



■•(:*.% 



sfc-^=»tag..^=ca 



I -t- CJJ. g 



At vero fit ;- — o. Hinc igitur etiam locum alterius poli in 

 proiectionc afiignarc poterimus, ponendo v — i 8o°; tum au- 

 tcm rcpcrictur x~ — ,1^6 ct y — o. Vnde fi cx altera partc 

 altcr polus (tatuatur in K, crit intcruallum 



Tum vcro fi capiamus C E~ C F~ 2, crit EF diametcr cir- 

 culi, quo refcrcair Hemifptiaerium totum circa centrum C de- 

 fcriptum, cuius ergodiametcr erit EF — 4, hoc e(t duplo ma- 

 ior quam diameter fpliacrae. 



§. 11. Vt nunc in hac proieftione Acquatorem defignc- 

 mus, fumamus v ~ 90'. atquc .v ct r fient coordinatac Aequato- 

 ris in proiectione ; tum autem crit 



X ~- l^fcS _ et y — lJ}nd 



1 -r- 'C\g' J-' " ' -+-;"i.g c>j. t ' 



Supra autcm iarn vidimus efie xx-\-yy—*-^~- f ' n -^ c3 L± ) hmc 



' -*-j'i.g .0. r ' 

 concludimus fore 



1 • 



-, vr.de fit cof. t 



***♦•» " -• ( '-1.'.. o <■•*. 1 ■ **Ji'-g,-[x*-i-yy)co;.g 



qui valbr fubititntus in acquatione pro x pracbct 



4. x fin. § — {* Jf -+-.>'.>') cof. g — '— 4 cof. g 

 vndc fit .v.v-|-.r.>' — i_^L'.-Sj±f£sJ , vnde colli?imus hanc 

 acquationcm : yy -f- ( 2 tag. g—x)' — ^. Hinc patct, Ae- 

 quatorem in proiectlone forc circulum radio — — i-defcriptum 

 Ad centrum autem huius circuli inueniendum capiatur inter- 

 vallum CI— 2tag.g, vt fiat IX = atag.g— x, ct cum fieri f 

 debeat X S : -+- 1 X : — cT ^ , patef fore I S — ^i- hoc e(t 

 quantii tti conftanti. Erit ergo hoc ipfum punetum I centrum 

 ciiculi Aequatorem referentis, exiftente CI:= 2tag.£. Quarc < i 

 Acla Acad. lmp. Sc\ Tom. I. P. /. S C 



Tah I. 



ig, 6. 



