OF PHOTOGRAPHIC APPARATUS. 1*33 



graduated glass measure, set of scales and weights, porcelain dishes, positive 

 and negative collodion, nitrate of silver solution, acetate of soda, pyrogallic 

 acid, albumenized and litmus paper, filter papers, alcohol, prota-sulphate of 

 iron, cyanide of potassium, glacial acetic acid, hyposulphite of soda, chloride of 

 gold, black and white varnishes, etc., in suitable stoppered bottles, in case 

 complete with lock and key . . . . . 5 10 



1587. No. 4 Set for Cartc-de-Yisite and Stereoscopic Pictures, with folding tripod for 



camera and every requisite, complete in box with lock and key 7 10 



1588. No. 5. CONSISTING- OF LARGER SET or APPARATUS of finest quality, adapted for 



plates of 6^ by 4f and under, with apparatus, chemicals, etc., complete, in pro- 

 portion, adapted for both portraits and views, in case with lock and key 



11 



MOUNTED LENSES. 



Improved portrait combination of achromatic lenses, fitted with Waterhouse 

 diaphragms, and rack and pinion adjustment. The focus is measured from the back 

 lens to the ground glass, and taken from an object placed at the usual distance for 

 portraits. 



Diameter. Combined Focus. Size ol Portrait. 



1589. If-inch. 3i-inch. 4* X 3i 200 



1590. 2Hnch. 51-inch. Carte-de-Visite. 400 



1592. 2|-inch. 6-inch. Carte-de-Visite. 400 



1593. 21-inch. 7-inch. 6| X 4f 440 



1594. 3-inch. 10i-inch. 8 X 6 990 



1595. Stereoscopic View LeilS, of 1^-inch. diameter and 4i-inch. focus, in brass 



mounting complete, with rack and pinion adjustment . 1 10 



*#* The definition of these lenses is beautiful and clear to the edge of the picture, the 

 chemical and visual foci are coincident, and the arrangement of the brass work so simple and 

 effective as to require no extra mounting, the whole being in every way equal to those sold at 

 much higher prices ; they may be had in pairs or sets of four for taking several pictures on one 

 plate. 



ROSS'S IMPROVED PHOTOGRAPHIC LENSES. 

 POETEAIT LENSES. 



These lenses give fine and correct definition, both at the centre and margin of the 

 picture, and have their visual and chemical-acting foci coincident. 



1596. No. 1. Portrait Lens, consisting of two achromatic combinations, mounted in 



tubes, with rack and pinion movement, the lenses If -inch, diameter, and 4 

 inch, focal length from the back glass, producing pictures on plates 4 by 3 

 inch, and under . . . . 500 



1597. A SET OF WATEEHOUSE DIAPHRAGMS, in morocco case, for ditto 15 



1598. No. 2. POETEAIT LENS, the lenses 2i-inch. diameter and 6-inch, focal length, for 



pictures on plates 5 by 4 inch, and under . . . 800 



1599. A SET OF WATEEHOUSE DIAPHEAGMS, in morocco case, for ditto 100 



