ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
129 
Fj = 258- 
F„ = 239- 
S“ = 275- 
S 2 = 
Fig. 17. 
H, 
F, 
s. 
(6) Objective reputed 16 rum., by Zeiss (“ apocbromatic ”).- 
auxiliary lens as in preceding for back focus.) 
A = 242 
•61 
■2 
•Od 
222-67 
/ = 16-43 mm. 
jf = 60-86 dioptries. 
H x = 242-18 
H 2 = 255-63 
k = — 13-45 mm. 
(Gauss points crossed) 
-(Used 
H, 
Zeiss’s Objective. 
(7) Objective reputed 8 mm., by Reichert. 
A = 251 
F x = 256 
F 2 = 250 
= 263 
S 2 = 243 
/=?• 
35 
72 
85 
78 
79 
06 mm. 
Fig.. 18. 
Reichert’s Objective. 
if = 141-6 dioptries. 
Hj = 249-66 
H 2 = 257-91 
k = — 8-25 mm. 
(Gauss points crossed, and 
lie outside focal planes) 
(8) Camera Lens (landscape), maker unknown.- 
of mount. All measures plumbed direct. 
A = 233-9 
Fj = 417-8 
F 2 = 151-0 
S x = 547-7 
S 2 = 20-45 
/ = 130-22 mm. 
Jf = 7 ’68 dioptries. 
H, = 287-58 
281-22 
= 6-36 mm. 
-A taken at front 
H 2 = 
(9) Aplanatic Condenser for Lantern, constructed by R. and J. Beck 
on Herschel’s formula. — A taken at front of mount on concave side. 
A = 237-5 
Fj = 365-5 
F„ = 193-3 
S" = 435-7 
S, = 121-8 
/= 71 0 mm. 
Jf = 14-8 dioptrics. 
Hj = 294-2 
H 2 = 264-3 
k = 29-9 mm. 
1892. K 
