119 
vh 
tj 2 .dip) 
VH 
U( 0 ) —<?+ 1 ) 
vj 3 d(p 
hvh 
( „ ' x , 3 K* L\ 
(w)_ w + __ î ) 
D 4 rf<p j (2K> 
2 HVR\\ H 
- *-) [£(») — 
$>] + 
5 K* 
IF 
— 3K l\ 
‘(60. i) 
y 5 d<p (/5 K 3 \ , N , 35/f 4 15tf 3 L 3L 2 > 
2HKÄ {(ö 2 3A: ■JgT iffT" + iff } 
/35Ä 4 ISA' 2 !, 3t 2 
»7 ® 
ThFvh 
iUh 3 
i? 
+ 
3L 2 \ 
[?w- 
+ 
63 ä : 5 
"2^ 
35tf 3 L 15ÄL a 
+ 
H 2 
m 
§. SI. 
Jam vero, ut bæc ad refractionem horizontalem deter- 
minandam adhibeamus , observandum omnino est esse tum 
Sin & = I , atque sic H — 2x x 2 y 
1 1 / x 1.3 1.3.5 , , \ 
VH V2x\ 4^4.» 4.8.12 1 
Ideoque , cum sit etiam ex hypothcsi 
<p = <p{o) { I + B ( Ï-) + c( *- J + D^J + &c. J . e~ "*(* ) 
