= (I+^^) = 



ncmpe v:iloribiis ipfarum x ct j' huitudini (3 refpoiukntibus , 

 eric ciiorda 



PE:=/0j'4-(^ — A-)*), 

 vcl chorda 



AE = y(xx-h(ia—yy). 

 Quia iam cft 



(Fig. 6.) AL — BErr AE(Fig. 9-)i 

 recfla pcr O ct E duc^^a dctcrminabit pun<f^:i X, qunc funt di- 

 viiioncs axis P/), di\ifionibus Mcridiani AP rc("pondcntcs. 



riiYSi- 



