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^Febrcary 27, 1880.] THR P£OTOGRAPHIC NRWB Vil THOMAS’S STANDARD ARTICLES THE LEAD KNOWN AS THE BEST, COLLODION. IT HAS THE LARGEST SALE. IT IS NOT SURPASSED IN QUALITY. IT MAY BE OBTAINED THROUGHOUT THE WORLD. 1‘ENDMN- THOMAS’S COLLODION, 1‘EABoMAtL USED BY EMINENTZPHOTOGRAPHERS FOR NEARLY A QUARTER OF A CENTURY. VOIGILANDERS NEW LENS, DOUBLE OBJECTIV, OF GREAT ILLUMINATING POWER, FOR EVERY KIND OF LANDSCAPE WORK, ARCHITECTURE, AND REPRODUCTION. ESPECIALLY VALUABLE FOR GROUPS, BOTH IN AND OUT OF THE STUDIO. NOW IN THE HANDS OF LEADING PHOTOGRAPHERS. This Lens possesses remarkable properties, owing to the power of light it commands. Its construction is based on calculations made by Professor SoNnER, of Brunswick, marking a new era in Photographic Optics. The results obtainable will at once show that a Photographer’s equipment is incomplete without it. 'The new Lens is composed of two Symmetrical Objectives, constructed on an entirely new principle. It can be used for groups with the full aperture, and thus gives a depth of focus as yet unapproached in photographic lenses It is perfectly Aplanat consequently for Copying Maps, or any work requiring absolute precision, it must take the first rank. THOMAS’S ALBUMENIZED PAPERS. Important Improvements have been effected, whereby the image is rendered more brilliant and kept on the surface. There is a total absence of stains and streaks. Photographic Artists who have not yet tested the present improved make of these Papers are solicited to supply themselves with a sample, sent free on receipt of twelve stamps. Per Quire, 6s.; Postage, 6d.; Per 5 Quires, at 5s. 6d.; Per Ream, £5. R. W. THOMAS, 10, Pall Mall, London, Sok Agent, Wholesale and Retail, in Great Britain, India, Canada, and British Settlements, for the Sale of Voigtlander's Photographic Lenses. A Prospectus, with Full Particulars, post free on receipt of Stamped Envelope. THOMAS’S SENSITIZED PAPER, Prepared with pure white of egg, free from defects, tones readily, gives brilliant proofs, and keeps perfectly white. Post free, per Sheet, Is.; Quarter-Quire, 5s.; Half-Quire, 8s.; Quire, 15s.; in stout cardboard tubes. THOMAS’S PURE PHOTOGRAPHIC CHEMICALS. A priced Catalogue of Apparatus and Chemicals, eighty pages, on receipt of six stamps, containing eight pages descriptive of Voigtlander’s Lenses. THOMAS’S NITRATE OF SILVER BATH Made from pure silver and pure nitric acid. Used by nearly all the leading Photographers in London. IT IS USED BY THE BEST MEN, AND AT THE GOVERNMENT - OFFICES, THE ADMIRALTY, ROYAL ENGINEERS, _ FOR THE ORDNANCE SURVEYS OF INDIA, MEW ZEALAND, ETC. IT IS THE COLLODION FOR INDIA. IT IS THE MOST SENSITIVE. THE IMAGE IS ROUND AND BRILLIANT