45, COENHILL, E.G., AND 122, REGENT STREET, W., LONDON. 



523 



[No. 



To work with Lenses, as follows : 



Price. 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



10 

 11 

 12 



Ser. III., No. 2, Ser. IV., No. 3, Ser. IV., No. 4, Ser. V., No. 1. 

 Ser. V., No. 2, Ser. V. No. 3, and Ser. V., No. 4 



Ser. IV., No. 5, and Ser. VI., No. 1 



Ser. III., No. 3, and Ser. VI., No. 2 . . . . '. 



Ser. II., No. 2, and Ser. HI., No. 4 



Ser. TV., No. 6 . . . 



Ser. II., No. 3, and Ser. VI., No. 3 



Ser. III., No., 5, and Ser. VI., No. 4 



Ser. IV., No. 7 



Ser. II., No. 4, Ser. III., No. 6, and Ser. VI., No. 5 '. 



Ser. VI., No. 6 . 



Ser. III., No. 7 



Ser. III., No. 8 



s. d 



4 15 

 550 



5 15 

 750 

 8 15 



10 10 



13 15 



17 5 



21 5 



25 15 



40 5 -0 



69 



Each Prism is accompanied by a short description of its use, with wide angle Aplanats. 



SERIES No. VIII. 

 3168 APLANATIC FOCUSSING LENSES. 



These are a combination of three Lenses, so constructed that, at a considerable 

 focal distance and large field, they produce an even, undistorted picture, achromatic, 

 both in and outside of the axis. 



FIG. 3169. 

 P. ZSCHOKK'S PATENT PNEUMATIC SHUTTER. 



FOR INSTANTANEOUS PHOTOGRAPHS. 



3169 Messrs. Steinheil make these Shutters for all sizes of Lenses. Price including 



tube for Lenses up to 4 Inches (108 Millimetres) diameter of Lens, measured at 



the part on which the wooden flange M N is adjusted (see fig. 3) , . 3 12 



Larger sizes supplied to order. 



