The photographic news

• Bandzählung: 35.1891
• Erscheinungsdatum: 1891
• Sprache: Englisch
• Signatur: F 135
• Vorlage: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: SLUB Dresden
• Rechtehinweis: Public Domain Mark 1.0
• URN: urn:nbn:de:bsz:14-db-id1780948042-189100009
• PURL: http://digital.slub-dresden.de/id1780948042-18910000
• OAI: oai:de:slub-dresden:db:id-1780948042-18910000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

January 2, 1891.] THE PHOTOGRAPHIC NEWS. 15 here yet down in the colony, and a few hours from here they are seen. Query: Is it a hybrid ? Very often bucks of all kinds will run with a farmer’s flocks and cattle for months together. They are slightly marked a very dull colour, not so distinct as Burchell’s zebra. A colonial—or anyone else, for the matter of that—could never mistake them if they had once seen them. I shall recognise the animal in your Year- Book. I will give you the modus operandi next mail. I am writing against time, so excuse this disjointed letter. If you see Mr. York, he will verify this letter. Messrs. Marion, my London agents, send me your journal every week. I would like to hear from you your own and the public opin ion of those pictures I took in the months of May and June of 1872. Mr. York promised this, but I never got it. It must be Mr. Harvey and the dodo, not Mr. York. B. Harvey. The Kimberley Photoyraphie Studio, December 1st, 1890. [Mr Bartlett, the manager of the Zoological Gar lens sys that the colonials in South Africa commonly mistake Barehell's zebra for the quagga. Heis not aware that a qu1gg has been seen for many years —Ed ] THE WORKS OF THE LATE 0. G. REJLANDER. Sir,—We have pleasure in informing you that we have acquired from the widow of this celebrated artist the whole collection of original negatives, numbering nearly 400, of the finest examples of photography. It is our intention to shortly hold an exhibition of these works at our show rooms, and to publish them in the form of prints, enlargements, and lantern slides. The photographic public will thus have an opportunity of obtaining at popular prices high-class reproductions of the works of this photographer, who was, as you are aware, one of the finest exponents—if not the finest—of the art side of photography the world has yet seen. A. E. Hayman. The Fry Manufacturing Company, 5, Chandos Street, Charing Cross, W.C., December 24th, 1890. INTENSIFYING WEAK NEGATIVES. Sr,—-The process you describe of Dr. Liesegang for intensi fying weak negatives by means of a varnish containing an evanescent aniline dye was suggested by me to Mr. W. J. Wilson about nine years ago, but there are objections to it as a practical process. I know of no aniline dye that will fade by the action of winter light with sufficient rapidity to be of any use ; if there be one, then the objection you point out would quickly assert itself, viz., the bleaching over the whole negative, especially if it were left carelessly about face upper most in the light. Films tinted with the dye and inserted between the negative and the printing paper ■would be a better way of carrying out this method. A useful plan for intensifying a finished negative (before varnishing) is one I used occasionally some eighteen or twenty years ago, viz., the powder process. This is an immense power in the hands of an intelligent and skilful operator, as by its use a negative can be either generally or locally intensified, according to the exposure of the bichromatized gum coating through the negative ; an entirely new negative can be superimposed on the original, or merely the very highest lights strengthened to any amount. GEORGE C. Whitfield. Watford, December 29th, 1890. The PHOTOGRAPHIC Club.—The subject for discussion on January 7th will be “Photomicrography”; January 14th, “ Dark Room Illuminants." In the course of a discussion at the Photographic Society of Chicago about the best method of making good lantern slides, Mr. Douglass remarked, “It depends more upon the man than upon the process.” It is said that as the workmen were beginning their daily duty on a fine house which Mr. Herkomer is having built at Bushey, there was a frieze to be carved, and Mr. Herkomer seized the implements and worked away with such a will that before sunset the frieze was finished. The men were hidden to copy it, and had hard work to do so. QProceedings Of Socetes. The Photographic Society of Great Britain. At the technical meeting of this Society, held on Tuesday evening, the 23rd of December, the chair was occupied by Mr. T. Sebastian Davis. A discussion on the use or omission of the eye-piece of the microscope when photographing microscopic objects for lantern slides was opened by the Chairman, who said that in his experience there was a certain amount of halation when the eye-piece was used. The eye-piece certainly gave a larger image, but that could be managed by putting the focussing screen farther from the objective. He wanted to know whether any of the members present had had any special experience of photographing microscopic objects with and without the eye piece. He also mentioned that he had found it necessary to use a very fine ground glass for the focussing screen for this class of work, and he recommended that the transparency of the screen should be increased by rubbing with grease when photographing objects of very minute character. There was also the question as to which kind of plate should be used when photographing subjects that were both of a ruby character as to colour, and that possessed great opacity from the thickness of the body, such, for instance, as the common flea. Mr. T. E. Freshwater had done a large amount of photo* graphing of microscopic objects recently, and if he could possibly help it he never used the eye-piece. He found that there was a tendency to reversal of the image when the plate was at all over-exposed. Only when he could not get a suffici ent degree of enlargement without it, did he use the eye-piece. Mr. W. E. DEBENHAM enquired what were the circumstances which, in Mr. Freshwater’s experience, necessitated the use of the eye-piece instead of simply removing the screen to a greater distance for obtaining the required degree of enlarge ment ? Mr. Freshwater said that only when the camera would not extend sufficiently to get the image large enough did he use the eye-piece. Mr. A. Mackie said that he had seen a statement by Mr. A. Pringle that nobody now took photo-micrographs without the eye-piece. The Chairman hoped that further investigation would be given to the subject. Mr. H. Chapman Jones asked whether Mr. Freshwater, in condemning the use of eye-pieces, referred to those made expressly for photographic use, or to the ordinary microscopic eye-pieces. Mr. Freshwater said that he was speaking of the eye pieces made for photographic work. He would not attempt to work with an ordinary eye-piece. He used a 4-inch condenser, and then condensed the light again with a smaller one. The exposure was sometimes very short. Last evening he had pho tographed the palate of a water snail, merely opening the objective and closing it again. The Chairman used paraffin as the illuminating agent, and of course gave comparatively very long exposures. When using the tube of the microscope, without the eye-piece being in serted, he found that there was apt to be a peculiar central flare, which arose from reflections from the inner surface of the tube. He found that a black velvet lining was best for reduc ing this reflection to a minimum. Mr. Mackie said that with a narrow tube even a velvet lining would not suffice to prevent reflection entirely. Mr. Freshwater said that a tube was quite unnecessary when there was no eye-piece. He brought the objective and the front of the camera close together. Mr. Debenham asked whether any of the members had made comparative experiments as to the advantages of a microscopic objective and that of a photographic lens of an aplanatic cha racter, such as the Petzval portrait lens, for photographing objects up to a certain degree of enlargement. The Chairman said that for enlargement up to four dia meters he preferred photographic lenses. Mr. E. W. Foxlee, as the result of his experience, preferred