TJRJLZJXEOS LVKJE. 513 



~ i '*-£ ttc-tS-— h * 4- rS - & ct tan S- G w 

 pjS.^I», ^deoque 2W-^+^DC + ^, 



Cum porro radii, \t AD, KG etc. ipfis graduum 

 Meridiani amplitudinibus fint proportionales, et vice ver- 

 fa , radios iam dietos ipfis graduum Meridiani menfu- 

 ris exprimere Iicet. Sic primi gradus latitudinis radius 

 AD crit —56753 hexaped. Gall. arcus Grauicentr. 

 totalis ED, fiue exceffus 90™ gradus iatitudinis fupra 

 primum ^959 hexaped. hinc EC —767! hexap. et 



DC 



Hunc in finem producatur ordinata HG ad F, 

 ducaturque ipfi infinite propinqua hg. Vocetuf 

 abfcifla HDx, ordinata HG/, arcus DG«; erit- 

 que, demifia perpendiculari G I in hgt G I zz dx, 

 \g — dy, gGnzdu, et G F rz £ a — -y ; adeoque in 

 triangulis \Gg et GZI fimilibus dy:du~-^a-y:GZ 

 fiue GZzZj~(~a—y. Eft autem in Grauicentrica 



jf—r^, J~ iitf-(T^-f-S*)(**-0% eta = Sr, 



, *S*dj f>f. J 4t /|S , T2 S*> 



ideoque du=t^! t tt dy-{LL-^i£)(a*--s*fds 

 ds-^y(^ 9 ); hinc ^Cl^-i) Tiue GZ 



= s* -+■ ^ - t^ — — ~t^ • Vnde aper- 



ta fiunt , quae fupra obiter monenda duximus. 



Tom.VI.Nou.Com. Ttt 



