OF PHOTOGRAPHIC APPARATUS. 



137 



New Patent Stereographic Lens, especially constructed for "instantaneous views," 

 small portraits, groups, interiors, landscapes, etc. 



Diameter of front and back combinations, l^-inch. and l^-inch. respectively, and 

 3f-inch. focus from the back glass (equivalent focus 5 inches). 



1638. In sliding mount, with Waterhouse central diaphragms, each . 4 5 



1639. NEW PATENT STEEEOGEAPHIC LENSES, as above, with rack and pinion move- 



ment, each . . . . . . . 4 15 



N.B. The front combination can be used alone, as it is (focal length 8 inches), simply by 

 unscrewing and dispensing with the back combination, when, with a small-sized stop, it will be 

 found to cover the 7i by 4-inch plate. 



1640. NEW WIDE-ANGLE LANDSCAPE LENS (PATENT). 



The lenses are mounted in " rigid" tubes or settings, with " rotating " stops. 



1642. RAPID RECTILINEAR LENS-PATENT. 



QUICK-ACTING PORTRAIT LENSES, 

 SPECIALLY CONSTRUCTED FOE CARTE-DE-VISITE PORTRAITS. 

 1643. No. 1 B POETEAIT LENS, consisting of two achromatic combinations, mounted in 

 tube, with rack and pinion movement, the lenses 2-inch, diameter, and 4i-inch. 

 focal length from the hack glass, producing pictures on plates, 4J by 



3i-inch. and under 5 10 



1644 A SET OF WATEEHOUSE DIAPHEAGMS, in morocco case . . 15 



Distance between the subject (5 feet 8 inch, high) and the lens, for a figure, 2| inch., from 12' 

 to 13 feet. The lenses can be had in pairs, or four, of exactly equal foci. 



1645. No. 1 B (LONG). Diameter of lenses 2 inch., back focus 4f inch., distance from 

 14 to 15 feet for above standard . . . . 600- 



This lens is constructed to meet the requirements of those photographers who require to use 

 a longer focus lens than No. 1 B, but who have not sufficient length of gallery for No. 2 B. 



