22 
Table of Magnifieation 
of the Achromatic Objectives with the Huyghenian Eye-pieces 
calculated for a tube-length of 160 mm and an image distance of 250 mm 
Eye-piece : 
1 
2 
3 
4 
5 
a, 
7 
10 
15 
20 
ai 
11 
16 
23 
30 
a.. 
20 
30 
40 
50 
aa 
a* 
4-8 
7-14 
10-20 
15-30 
a* 
aa 
25 
35 
47 
60 
77 
aa 
A AA 
O I 
1 V 
A, AA 
D 
D 
oO 
OO 
lio 
1 /I K. 
loo 
D 
D 
c 
105 
145 
200 
265 
325 
c 
D, DD, D* 
175 
240 
325 
420 
540 
D, DD, D^- 
E 
280 
390 
535 
680 
865 
E 
F 
415 
585 
790 
1000 
1275 
F 
H 
320 
440 
610 
770 
985 
H 
J 
430 
585 
810 
1030 
1315 
J 
1 
IS 
385 
530 
730 
925 
1180 
1 
is 
1 
2 
a 
4 
5 
