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The photographic news
- Bandzählung
- 24.1880
- Erscheinungsdatum
- 1880
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1151, September 24, 1880
- Digitalisat
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Zeitschrift
The photographic news
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Band 24.1880
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- Register Index 631
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Band 24.1880
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September 24, 1880.J THE PHOTOGRAPHIC NEWS. 457 Uhe A9qotographir Beta, Septemyer 24, 1880. feet, and to revert to the old order of things. It is only, Et foe, has the There is gradually formed a blackish-brown precipitate, even in the dark room, and this naturally detracts something from the action of the intensifier. It has been said that in employing Edwards’ intensifier, sulphide of mercury is formed; but this can hardly be; the intensifier acts precisely as if there was no hyposulphite present. This is apparent if one half of a plate is treated with Edwards’ intensifier, and the other with a solution of iodide of mercury in iodide of potassium, such as is obtained by dissolving five parts of chloride of mercury in fifty parts of water, and adding thereto five parts of iodide of potassium. Both halves of the image will be found to be evenly intensified. If, how ever, the plate, after intensifying, is dipped in a concentrated solution of hyposulphite, then both halves are in like manner equally weakened, the subiodide of mercury IHg: I) which has brought about the intensification being decomposed by the hyposulphite. If sulphide had been formed in the intensifying process, the hyposulphite would have no action, since sulphide of mercury is not decomposed by hyposulphite. High and Low Sludios.—k. good deal of discussion has lately taken place abroad, on the subject of high and low- roofed studios, and as to which are best for portrait making. It seems the general opinion among German photographers, and those of Berlin particularly, that a low glass-house (ten to twelve feet high) is better than a lofty one. Portraits require contrast and a vigorous lighting of the head, with the lower portions of the body in a subdued light, and this result, it is argued, is obtained more easily in a low studio than in a high one, which has diffused light throughout. A Berlin photographer, who recently built an atelier on the model of the renowned studio of sulphite on the cardboard is yet an open question. Dr. Vogel has communicated to us that he obtained a large sheet of cardboard from a photographer which should have occasioned the fading of pictures pasted on it. Ue mounted a row of photographs on this piece of cardboard, and these kept perfectly, without any trace of fading. Yet, further, he took a piece of pure cardboard, and laid it for two hours in a five-grain solution of hyposulphite, and dried it; photographs mounted on this cardboard have kept perfectly, without showing a trace of fading. In any case, impurities of the starch paste act much more dis- advantageously on the pictures than impurities of the cardboard. Edwards' Intensijicr.— Edwards’ intensifier, prepared by mixing bichloride of mercury, iodide of potassium, and hyposulphite, has obtained recognition on all sides by dry plate men; but we are still in darkness as to its mode of action. It is known that the mixture of iodide of potas sium and chloride of mercury made according to Edwards’ method forms a precipitate of iodide of mercury, which is dissolved again by an excess of iodide of potassium. But the quantity of iodide of potassium recommended by Edwards PHOTOGRAPHY IN AND OUT OF THE STUDIO. Hyposulphite in the CARDBOARD— Edwards’ Intensifier —High and Eow Studios—Photo-zincography for Illustrating Catalogues. Hyposulphite in the Cardboard.—It is one of many hitherto-recognized facts that pictures which have kept excellently for years in an unmounted condition often quickly turn yellow if they are pasted on cardboard. Specimens of cardboard have been examined by extracting them with hot water, and the presence of hyposulphite has been inferred, as the aqueous extract decolourised blue iodide of starch. The presence of hyposulphite in card- I Loescher and Petsch, was so convinced that the roof was board can easily be explained, as it is used in the paper ' not high enough, that he spent £150 in heightening it; but manufactory as an “ antichlor,” to combine with the last ( after two years he came to the conclusion that he had made traces of chlorine which remain behind in the paper after a mistake. Not deterred by this example, another gentle- the bleaching process. A chemical substance, sulphite of man in the Parisian capital has built a studio thirty feet soda (Na,>0a), has lately been used for this purpose instead ] high, in the hope that he might thereby improve the modell- M. LAFOSSE AT KNOLL’S HOUSE, MANCHESTER Delightfully situated in its own grounds at Higher Broughton, above the vapours of murky Manchester, is a quaintly built villa of black oak, a bit of mediaeval archi tecture that seems to have been forgotten by the modern builders, who have been so busy planting their bricks and stucco around. It is Knoll’s House, and, posed on its terrace like pedestal, it appears all the brighter and more pleasing by reason of its contrast to the solemn square edifices in the neighbourhood. The gable roof and shining black beams are charmingly picturesque, and as the building lies back at some distance from the road, there are quietude and repose to still further enhance its being. The interior is no less pleasing. An oak passage, some what low and sombre, with shining casques of steel and polished breast-plates on cither side, leads to a panelled room in which there is much exquisite carving. Here everything is in good taste and keeping with the structure. The furniture is all of black oak, and on the massive sideboard are tankards and platters of burnished silver. The fire place is of medieval design, and the settees and curtains have an air of the tapestry age about them. To be brief, in the construction of Knoll’s House, every bit of Old Manchester that could be collected together by its builder was made use of, and the experiment, a risky one, has yielded a very happy result. It is only the oak room and lien entendu, portraiture that is here under discussion. For other photographic work, reproduction, &c., a lofty studio has, of course, advantages over a low one. Photo-Zincography for Illustrating Catalogues.—It is well known that the illustrated “Notes” of our Royal Academy and of the Paris Salon contain a large number of prints reproduced from sketches contributed by different painters. These sketches are reproduced for the most part by means of photography, or a kind of photo-zinco graphy. The pictures are photographed, a photo-litho transfer obtained in fatty ink, which is placed upon a zinc plate, and the plate subsequently etched. Pen and ink originals give the best results, as might be anticipated, for the jet black lines are so well rendered by photography. In London there are several establishments where the pro cess is carried out, but Paris, Berlin, and other Continen tal cities seem to have more demand for this class of work, and hence larger copying establishments of this character are to be found abroad. is not sufficient for the solution of the precipitate ; it is, however, immediately dissolved on the addition of hypo sulphite. A double salt of hyposulphite of potassium and mercury is by this means formed, as Rammelsberg described it: The gradual decomposition of this double salt by separation of metallic sulphide is well known, and it is not to be wondered at, therefore, that the durability of the Edwards intensifier is of a somewhat limited character. 3Hg I, + 8Na s, OJ = GNa I + 53Hg S O (•M2 P2 •s of hyposulphite (Na,S,0:), because the former is said never i ing of his pictures ; but he has found the experimentanswer to act disadvantageously on photographs. It appears, ' so badly, that he has now resolved to raise the flooring ten however, that the disadvantageous action of the hypo- feet, and to revert to the old order of things. It is only,
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