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The photographic news
- Bandzählung
- 13.1869
- Erscheinungsdatum
- 1869
- Sprache
- Englisch
- Signatur
- F 135
- Vorlage
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- SLUB Dresden
- Lizenz-/Rechtehinweis
- Public Domain Mark 1.0
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- urn:nbn:de:bsz:14-db-id1780948042-186900000
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- http://digital.slub-dresden.de/id1780948042-18690000
- OAI-Identifier
- oai:de:slub-dresden:db:id-1780948042-18690000
- Sammlungen
- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
- Bemerkung
- 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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- Parlamentsperiode
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- Wahlperiode
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- Bandzählung
- No. 539, January 1, 1869
- Digitalisat
- SLUB Dresden
- Strukturtyp
- Ausgabe
- Parlamentsperiode
- -
- Wahlperiode
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Zeitschrift
The photographic news
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Band 13.1869
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- Register Index To Volume XIII 629
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Band
Band 13.1869
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- Titel
- The photographic news
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foreigu liscellanex. A general treatise of photography has just been published by Dr. Borlinetto, of Padua; the work is printed in the Italian language, and occupies a thick octavo volume. The distribution of awards has been made at the Havre exhibition. Among the fifty photographers who exhibited, eight gold and six silver medals were distributed, besides thirteen honourable mentions. Among other papers which have been forwarded to the French Academy of Sciences to compete for the Montyon prize of 1869, given for the encouragement of medicine and surgery, are a collection of photographic studies of the nervous system of man and several of the superior animals, taken from sections of congealed nervous tissue. At the bi-annual public meeting of the Statistical Society of Marseilles, M. Leon Vidal, the talented Secretary of the Marseilles Photographic Society, read an interesting paper on the Progress of Photography, illustrating his remarks with specimens of the Swan and Woodbury process, and of. the methods of MM. Baldus, Lafon de Camarsac, Niepce de St. Victor, Placet, Lemercier, &c. In the Photographische Correspondenz, M. Adolph v. Gotz publishes a paper on retouching photographs. His method of preparing the albuminized surface to receive the pig ment is to rub it over with a tuft of cotton wool dipped in clean glycerine; the print is thoroughly coated with this material, and then a second and a third tuft of dry wool is rubbed over the surface until the latter is free from greasi ness when touched by the finger. The albumen, when moistened in this manner, readily receives pigments which would be at once repelled by a dry, horny surface. At a meeting of the Vienna Photographic Society, held on the 3rd ult., it was stated that M. Schroder, of Ham burg, is at present occupied in constructing a telescope to be fitted with clock work, for photographing the heavenly bodies; the instrument is so arranged that the object to be reproduced will be considerably enlarged before it is thrown upon the sensitized plate. At the same meeting some discussion took place relative to the qualities of the Harnecker collodion, which had been experimented with by several members, both in the wet and dry processes; the general verdict pronounced was somewhat unfavourable. In the Correspondenz, M. Wendling makes a statement to the effect that the reason of the discolouration of sensitized albuminized paper is similar to that which produces foggi ness in a negative in hot weather : in both cases a reduc tion of a silver compound takes place, which is insoluble either in cyanide of potassium or hyposulphite of soda. M. Wendling also recommends the following method of inten sifying a varnished negative which may be considered to be too transparent. Take a mixture of equal parts of alcohol, sal-ammoniac, and water, and pour it several times over the plate ; then treat the latter with a solution of corrosive sublimate; and, finally, apply another coating of varnish. The Hamburg Photographic Exhibition was opened with great ^clat on the 14th ult. The principal officials of the town, as also many strangers of note, were present at a conversazione which inaugurated the commencement of the exhibition. In the course of the evening, Dr. Stinde deli vered an address in the presence of a numerous body of visitors. It is contemplated to present every member of the Photographic Society with a photograph in enamel, of cabinet size, burnt into the centre of a porcelain plate. A manual of “Microscopic Photography,” by MM. Oscar Reichard and Carl Sturenburg, has just been published at Leipsic. The size of the plates used by these gentlemen was three inches square; instead of a ground glass for focussing, which would present too rough and coarse a surface, a collodion plate sensitized in the ordinary man ner, and treated with a solution of iodide of potassium, was used for the purpose. The question as to whether sunlight or diffused light is the more suitable for operating is fully discussed, the authors inclining to the preference of diffused light. Sunlight is apt to produce coloured beams of light around the lines of the picture, which have the effect of rendering the image confused and undefined. Objects in glycerine yield by far the best pictures, and none should be used for photographic purposes which are not of first-rate order. Besides the ordinary wet collodion process, with iron developer and mercury intensifier, the authors recommend the employment of collodio-albumen plates, which yield exceedingly fine negatives, from the ‘act of the pores of the collodion being filled with the sub sequent coating of albumen. A sensitized collodion plate is washed, coated with iodized albumen, washed again, and covered with a 10 per cent, solution of silver; it is after wards developed with a compound made up according to the following formula:— Pyrogallic acid ... ... ... 1 part Water 90 parts Formic acid ... ... ... 30 ,, M. Isidor Dubost, in the Archiv, states that the only reliable way of obtaining clean, sensitive coffee plates, free from stains, is to add small quantities of acetic acid to the first three water baths in which the plates are washed after their preparation ; when they have been well drained they are placed in a drying-box, furnished with a saucer of strong sulphuric acid to absorb moisture. In the same journal appears a formula of M. C. Stern berg, for preparing a developer especially suitable for the treatment of negatives bearing reproductions of paintings; it is as under :— Water... 1 ... ... ... 200 grammes Sulphate of iron ... ... 8 „ Nitrate of lime ... ... 1 gramme Glacial acetic acid ... ... 6 grammes Spirits of wine ... ... 12 ,, SILVER PRINTING—ADVANTAGE OF THIN FILMS. BY WILLIAM BLAIR. The favourable notice of my simplified carbon prints which lately appeared in the Photographic News encourages me to farther perseverance, particularly with the non-transfer process, as I am now satisfied that it may be useful for a large class of subjects, and think it may be still farther im proved. No doubt, with the assistance of others, it might be brought to greater perfection in shorter time. Still, there is a variety of modifications of which the process is suscep tible which I have not yet been able to overtake by actual experiment, and which I have a wish to try before calling in foreign aid. Of course, as other heads and hands are busy, I may be forestalled by delay, but I shall not regret this much, if it is not carried to the Patent Office, and my own hands as well as others tied-up from working it. Meantime, it appears to me that there is a strong tendency in many quarters to cling to silver printing, and the well- known certainty and beauty of the results form a strong temptation to do so. Perhaps, then, instead of endeavouring to discourage silver printing altogether, it might be better that a renewed effort were made to place it on a firmer basis. This, no doubt, is being attempted in some quarters, and, trom the ability and experience of the parties engaged in it, may be successful to a considerable extent. That many silver prints have, under favourable circumstances, lasted a goodly number of years, appears to be undoubted ; and if we could insure their preservation in a good condition for even half a century, they would frequently serve their pur pose, and might be reckoned of no small value.
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