THE SIGHT preserved by the Use of SPECTACLES adapted to suit every variety of Vision by means of SMEE'S OPTOMETER, which effectually prevents Injury to the Eyes from the Selection of Improper Glasses, and is extensively employed by
BLAND & LONG, Opticians, 153. Fleet Street, London.
IMPROVEMENT IN COLLODION.—J. B. HOCKIN & CO., Chemists, 289. Strand, have, by an improved mode of Iodizing, succeeded in producing a Collodion equal, they may say superior, in sensitiveness and density of Negative, to any other hitherto published; without diminishing the keeping properties and appreciation of half-tint for which their manufacture has been esteemed.
Apparatus, pure Chemicals, and all the requirements for the practice of Photography. Instruction in the Art.
THE COLLODION AND POSITIVE PAPER PROCESS. By J. B. HOCKIN. Price 1s., per Post, 1s. 2d.
PHOTOGRAPHIC APPARATUS, MATERIALS, and PURE CHEMICAL PREPARATIONS.
KNIGHT & SONS' Illustrated Catalogue, containing Description and Price of the best forms of Cameras and other Apparatus. Voightlander and Son's Lenses for Portraits and Views, together with the various Materials, and pure Chemical Preparations required in practising the Photographic Art. Forwarded free on receipt of Six Postage Stamps.