S3 



Voitglander's Doable Combination of Achromatic Lena**, 

 3 in. diameter, mounted in brass cells, and tube with 



rack- work adjustment 20 



Ditto Diito 2 inches diameter 10 10 



Ditto Ditto If diameter 660 



Double Combination of achromatic lenses of very supe- 

 rior English manufacture, of corresponding curvature 

 to Voitglander's, mounted in brass front, with rack- 

 work adjustment, 4 in. diameter 1515 



Ditto Ditto 3 in. diameter 1U 10 



Diito Ditto 2 in. diameter 440 



Ditto Ditto 1| in. diameter 3 10 



The advantage gained by using the double combination of 

 achromatic lenses over the single arrangement is, 

 that they are tar more rapid in their operation, and 

 give a much sharper picture^. 



Achromatic lenses, 1 inch diameter, 4 inch focus, and 



upwards 



Do. 1 inch diameter, 5 inch focus, 080 



Do. 1 ,, 6 10 6 



Do. 2 6 14 



Parallel Mirrors mounted in brass frames, to attach to 



the front of the Camera, for reversing the pictures, 110 

 Prisms for Ditto Ditto. 



Piano Convex, Periscopic, Miniscns, and every descrip- 

 tion of Lens required in Photographic Experiments. 



Brass Camera Fronts, with rackwork adjustment for 

 Lenses, ! inch, 1$ inch, 1& inch,l| inch, and 2 inch. 



Prices, 11s. HJs. 14s. las to 018 



Brass Camera Fronts, with sliding tube for 1-inch lens .060 



Ditto l-incli lens < 070 



Ditto l$-mch lens 090 



Ditto 1-inch lens 10 



Diito 2-inch lens ........ 12 



Brass Camera Fronts, with revolving diaphragm, on 

 which are apertures of different diameters for regu- 

 lating the intensity of the light, according to the 



nature of the picture, 1 $ in 7 



Ditto Ditto 1& in 090 



Ditto Ditto 1| in.<** 10 6 



Ditto Ditto 2 in 015 



Mercury Boxes for small Cameras IS 



Ditto Ditto 15s. 19 



Ditto Ditto best construction, with cast iron 



o 



