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The photographic news
- Bandzählung
- 13.1869
- Erscheinungsdatum
- 1869
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- Englisch
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- F 135
- Vorlage
- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- http://digital.slub-dresden.de/id1780948042-18690000
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- oai:de:slub-dresden:db:id-1780948042-18690000
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- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
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- Heft 545 (S. 73-84), Heft 547 (S. 97-108), Heft 589 (S. 599-610) fehlen in der Vorlage. Paginierfehler: Auf Seite 444 folgt Seite 443
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- Bandzählung
- No. 558, May 14, 1869
- Digitalisat
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Zeitschrift
The photographic news
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Band
Band 13.1869
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- Register Index To Volume XIII 629
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Band 13.1869
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236 THE PHOTOGRAPHIC NEWS. to receive my most sincere salutations, Rolloy fils. . 1 ounce . 2 ounces 24 fluid ounces This is for summer work; in winter 1 simply add another halt' is this— Sulphate iron. Glacial acetic Water... PHOTO-RELIEF PRINTING PROCESS. Paris, 2nd Mai, 1869, 28, Rue de la Trevise. Sr,, When any process is protected by patent from em ployment by the public, it rests with any one to discuss its details in a bond fide manner, and to consider whether the [The passage quoted certainly seems to suggest a similar idea to that embodied in Mr. Woodbury’s process, but it is scarcely sufficiently definite to afford a clear idea of how results are to be produced ; and the fact that the suggestion had been in print for nearly a quarter of a century without being utilized bears out this notion. But, in any case, we presume that Mr. Woodbury’s patent would still remain safe, being based on the utilization of an intaglio plate pro duced by photography, for printing in transparent colour, and so obtaining a fac-simile of the photograph. That thing had not been done before, and that thing it is, we presume, which is protected in Mr. Woodbury’s patent.— Ed.] same are really wholly or partly new. Your journal pos sesses the very high merit of impartiality, and is, I believe, open to any loyal discussion of facts without reference to personal matters. As a simple amateur, although a curious and attentive one, without any material interest in the question one way or the other, I have deliberated whether the following lines do not indicate the salient points of the Woodbury process; they are a correct extract from Becque- rel’s work on the “ Elements of Electro-chemistry” (p, 408), published by Firmin Didot in Paris in 1843. “ M. Kobbell, of Munich, has applied the process of electrotyping to a description of engraving of which we must make mention. His process consists of making a design, and painting the same by means of a brush and a transparent colour upon a plate of silver or copper, of any object which he wishes to reproduce as an engraving. The shadows are produced by very thick layers of colour, the half-tones by layers of decreased thickness, and the high lights by the absence of the colouring matter altogether. Upon this design is formed a covering of copper sufficiently thick to resist pressure, and in this manner is produced a plate in which the deepest tints are represented in intaglio. In filling the hollows with a transparent colour, which is disposed upon paper by means of a press, a proof is obtained identical with the original.”* Mr. Woodbury employs bichromated gelatine and pres sure to produce the intaglio, but I do not know whether he claims these two mediums. On what basis, however, does his patent rest? Or, in other words—the use of bichro mated gelatine being allowable—what prevents any one from making use of the Woodbury process ? I am not the only one, I believe, to whom this question has occurred, and I do not think, therefore, that Mr. Wood bury or the proprietors of his patent will take it much to heart if the point is raised in a journal so widely circulated and esteemed as the PHOTOGRAPHIO News.—Agree, monsieur, IRON DEVELOPER. SIR,—Among the many valuable papers published in your invaluable News, that by M. Carey Lea, on Deve lopers and Development, in your last number, is not one ot the least important, and should be known by all operators. I have used a developer similar to his first formula for the last five years, and have never found it fail. My formula pouring on to the plate, and I never found the iron developer lose its activity, unless when the nitrate bath became acid. I also found that the light had no prejudicial effect after development had commenced with an iron developer, and, therefore, I never draw up the plate into the protector from the developing bath, but loosen the clip, and leave the plate in the bath, and wash it in open daylight.—I remain, my dear sir, yours very truly, Thomas Barrett. May, 8th, 1869. [There cannot be a doubt as to Mr. Barrett’s priority in this matter, as the description of his manipulating camera was published in the Photooraphic News in October, 1858. The detailed and illustrated description of a very complete and perfect piece of apparatus will be found in the numbers for the 22nd and 29th of the month named, by those desirous of making further acquaintance with the subject. Mr. Barrett’s testimony on the subject of developing in a bath is valuable, as based on careful experience.—Ed.] STABILITY OF GUM NEGATIVES. Dear Sir,—The question raised by “ Cymbo,” in the News ot last week, as to the permanency of gum plates, has been satisfactorily answered (at, least, theoretically) in your leading article, which ought to dispel any misgivings upon the subject from the minds of timid photographers. This opinion I can confirm by the experience of six years, for in 1863 and the two following years I took a great many negatives by a dry process, the preservative of which consisted principally of gum. After reading your article, I thought it desirable to look over the negatives taken by this process, and see if they showed any symptoms of decay. Accordingly, I over hauled my stock, and I am glad to say, that although the negatives have been stored in a common deal plate-box, and kept in a damp room, which has not had a fire in it for twelve months, they were all as perfect as when developed, nor could I find a trace of injury arising from the giving way of the film. I send you herewith a few prints from negatives taken in 1863-4-5, which show how suitable the gum process is for most kinds of subjects, and I am convinced the more it is worked the more it will be liked.—I am, yours truly, Copt Hewick, nr. Ripon, May 3rd. Jos. S. Hurst. [The testimony and results of a skilful and experienced dry-plate worker like Mr. Hurst (formerly of Mirfield) are very satisfactory, and will help to set at rest any doubt on this subject.—Ed.] * For the purpose of exactness we add the text of the extract In the “M. Kobbell, de Munich, a appliqu la galvanoplastie A un genreade gravure dont nous devons falre mention. Son procd consiste a et A lover au pinceau avec une couleur trarisparente, sur uni. E d’argent ou de cuivre, les objets que 1’on veut reproduire en tumfeur 1es Les vigueurs sont donnes par les plus grandes paisseurs de p'.hsenM de demi-teintes par les dpaisseurs moindres, et les lumieresparNaosedDaisse toute couleur. L’on depose sur ce dessin une couche de cuivre asse p^^ pour resister a la pression ; on a ainsi en oreux les teintesies!P P Enremplissant ensuiteces creux d’une couleur transparent , 1 uve pose sur le papier au moyen d’uue presse, on obtient ainsi P identique avec l’original." WET LANDSCAPE PHOTOGRAPHY WITHOUT A TENT. Mr Dear Sir,—I have read Mr. Whiting’s description of his photo-camera lucida, and, without wishing to detract from the merit of his plate-protector, which he considers “ worth its weight in gold,” I cannot see that it protects the plate from the injurious action of light better than mine. Indeed, there is, it appears to me, a short period of time previous to placing the blotting-plug on the lower end when a small amount of light must enter. This is not the case in mine. It is perfectly immaterial to me whether the public take up mine or not; but as Mr. Whiting has protected his, I trust it will not be said, some day, that to make my camera might be considered an in fringement of his patent, as was the case with the French camera, though it was made years after mine was described in the News. When I first used my apparatus, some twelve years ago, I found that development was more even by dipping than by
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