+ i; *' = 



122 

 r 



> 



1 



z 2 . (AT /) N' -t- z 



4. His factis, distantiae focales quatuor Lentium 

 m t . p -f- 1 



-, P", P", erunt: P = 



p-+- i .F 



p - _ 



m-i 



M 



>-<)-f- 



=(p : 



i-f-^_ ^ i-H 



m f . p H- r p + i.F 



P' = - 4 - X F= -- = .---)xP; 



m-i 



P" = 



2.BI - 



. m r . F 



_l_^_^M 



.-' 



Intervalla 



m t 



vero Lentium erunt: PP*= o; P' P"= --- X ^*; 



m 



p" P"' r= 



4 . m i 



w . font i^ 



li a lente oculari ultima, = - - : X F- 



w a . (* i 



F. Praeterea erit distantia ocu- 

 m i . 



. 5. Formae Lentium Ohjectivarum P & P ita 

 terminantur: Inveniantur duo numeri x & *', quorum relatio 

 definiatur sequenti aequatione: 



. f 1 / P-P+ 



^. + g' 



C"H-0-' 



y * a 



^ 4 



r/j-f-O / *.?^H-Of(H-J 



g 



* 



