34 



for the Daguerreotype, Calotype, or Energiatype 



processes 1 1 



Do. Do. with Achromatic Lens 1 5 



with rackwork adjustment fig. 11 1 15 



with calotype chemicals and apparatus .. 2 10 

 with Daguerreotype apparatus and mate- 

 rials, complete in case 5 5 



Second size do. with achromatic lens, and sliding tube 1 15 



with rackwork adjustment 2 2 



with calotype chemicals and appa- 

 ratus. 3 16 



with Daguerreotype apparatus, and 



materials complete in case .... 6 10 

 Lerebour's Parisian Apparatus, with the latest im- 

 provements. 

 Cundell's Photographic Cameras, as described in the 



Philosophical Magazine, with double miniscus lenses 3 3 

 Voitglander's Double Combination of Achromatic Lenses, 

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



rack-work adjustment (Fig. 5) 20 



Ditto. Ditto. 2 inches diameter. 10 10 

 Ditto Ditto. If diameter. 6 6 

 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, 3 in. diameter 



Ditto. Ditto. 2 in. diameter 4 4 



Dilto. Ditto. 1 in. diameter 3 3 



Ditto. Ditto. 1 in. diameter 210 



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 6 



Do. 1 inch diameter, 5 inch focus, 8 



Do. If 6 10 



Do. 2 6 14 



Parallel Mirrors mounted in brass frames, to attach to 

 the front of the Camera, for reversing the pictures, 

 (Fig. 5. D) 



Prisms for Ditto. Ditto. 



Piano Convex, Periscopic. and every description of Lens 



required in Photographic Experiments. 

 Brass Camera Fronts, with rackwork adjustment for 

 1-inch lens, lls.; 1^-inch lens, 12s.; If-inch lens, 

 14s. ; If-inch lens, 15s. ; 2-inch lens, 18s. 



