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The photographic news
- Bandzählung
- 27.1883
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- 1883
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1304, August 31, 1883
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The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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When gelatine emulsions have been treated with bichro mate of potash or other powerful oxidizing agents, sensitizers have a remarkable power in restoring the sensitiveness. 5 and 6. Behaviour of the hromitles with the developer, and their different behaviour when heated.—These are closely con nected with each other, so I mention them together. Silver bromide in its finest state of division—i. e., when orange or ruby red by transmitted light—does not show any great difference in sensitiveness, whether in gelatine or collo dion, and by either mode of development; but after digestion with a solvent, the bromide emulsified in gelatine becomes far more sensitive to alkakine development. Does this prove there is a fundamental or isomeric difference in the two bromides ? I think not: along with the increased sensitiveness there is an invariable increase of size in the particles of silver bromide, and as long as this increased size of the particles is brought about, it does not matter whether the silver bromide is boiled with excess of soluble bromide, or digested cold with ammonia, or produced directly in aqueous solutions by Capt. Abney’s method. Exactly the same physical changes or increased size of the particles occur under similar conditions with the silver bromide in collodion emulsions, and, as before stated, as the amount of pyroxyline employed diminishes, so the sensi tiveness increases; and if silver bromide prepared and digested in collodion could be separated from the pyroxline and emulsified in gelatine, the difference in sensitiveness would probably disappear. While feeling that my knowledge of the photo-chemistry of silver bromide in different media is very imperfect, 1 think the view that pyroxyline is a powerful restrainer explains many facts which are otherwise difficult to under stand.—Yours faithfully, E. Howard Farmer. 6. It gives lovely tints and brilliant prints, although as easily toned and fixed as albumenized paper. 7—and last, not least. The prints are permanent, so far as we can judge, and have reason to believe. In conclusion, I would appeal to some of your pro fessional readers to try to secure an agency in this country for Herr Linde’s and Herr Obernetter’s papers, and so supply a want much felt by many a photographer besides—Yours very faithfully, C. F. Bailey. Lynton, North Devon, 26th August. A WATER PARTY. Dear Sir,—A party of photographers are anxious to make the journey down the river Thames from Oxford to Teddington in a House Boat (fitted up for eating and sleeping on board), for the purpose of taking negatives en route ; and in order that the individual expense may be lessened, would be glad to be joined by two or three more gentlemen, and have commissioned me to ask your kind indulgence, and allow this to appear in next issue of Photographic News, with the intimation that all appli cations be made as early as possible to—Yours faithfully, W. T. Wilkinson. 102, Lower Park Road, Peckham, S.E. It is proposed that the boat be towed ten or twelve miles each day, negatives being taken of the scenery en route, and as the boat will be fitted up with a dark room, develop ment can be effected on the spot. The wet collodion pro cess will be used, as well as gelatine, for comparison as to quality and speed ; and pyro, hydrokinone, and ferrous oxalate for gelatine development, thus offering a grand opportunity for gaining experience and passing a pleasant holiday in the company of congenial spirits. PERMANENT SILVER PRINTS. Dear Sir,—Adverting to an article in the News of the 17th inst., on “Permanent Silver Printing,” I wish to remark that when I used Obernetter’s collodion-faced ready sensitized paper in May, 1870,1 found it work uncommonly well with the usual toning and fixing baths, and that it was unnecessary to go in for the complicated formula re commended with the following bath:— Chloride of gold 2 grains Phosphate of soda ... 2 drachms Distilled water 10 ounces I obtained the most beautiful results, and these brilliant prints are as good to-day (framed under glass and hung all these years in a strong light) as when produced. I should mention that the fixing bath used was of the strength of two ounces of hypo, of soda to thirty-five ounces of water. The prints were well washed before toning, as the collodion surface holds the extra nitrate of silver very firmly. Your correspondent says the printing should not be so deep as when using albumenized paper; but 1 found the reverse to be the case, and had to over-print a good deal, as the above toner and fixer took more out of the prints than in the case of albumenized paper. Mr. J. Solomon, of Red Lion Square, used to be an agent for Herr Obernetter, and it is to be regretted that there is now no agent here for the sale of this excellent paper. Mr. Solomon’s price used to be 45s. a quire. The advantages of the collodion-faced paper, at least for an amateur like myself, may be summed up as follows : — 1. It is ready sensitized. 2. It will keep for months. 3. It prints very rapidly. 4. Negatives too feeble for albumenized paper will print much better on it. 5. It gives marvellous details of the negative, there being no texture of the paper to interfere. 2roceedings of Societkes. PIOrOGRAPHIC Society of Great Britain. A MEETING of the Society was held at 5, Pall Mall East, on Tuesday, the 28th inst., Mr. Baden Pritchard, F.C.S., Vice- President, in the chair. The Assistant Secretary (Mr. Cocking) distributed some notices touching the exhibition at Newcastle-on-Tyne to be held in November. Mr. WARNERKR, who had just returned from the Brussels Exhibition, gave a most interesting account of the gathering in the Belgium capital. It was one of the most complete exhibitions ever held, and the British exhibitors, Mr. Warnerke was glad to say, were decidedly in the vaninrespectto pictorial photography. This, indeed, must be evident to all, Mr. Warnerke said, from the list of prize-winners published in the Photographic News last week. The picture that secured the gold medal given by the King of the Belgians—Mr. H. P. Robinson’s “ When the Day’s Work is Done"—while it was unanimously chosen for that honour by the judges, had, moreover, called for the special commendation of His Majesty himself, who declared it to be the best photograph in the collection. Mr. Warnerke also called attention to a matter that came under the attention of the authorities at Brussels and of the judges in a very marked manner: it was the annoying custom that prevailed among photographers of calling the same thing by different names, and employing different formula: and different measurements in different countries.* What was very desirable was a unification of terms to be adopted by all nations, and a congress with this end in view it was determined to hold in Brussels next year. M. Montefiore, one of the council of the Belgian Society, and a personal friend of His Majesty, had spoken to the King on the subject, and the latter promised the affair his support. An international photographic congress, therefore, under the auspices of the Belgian Government, may be considered an accomplished fact. Mr. Warnerke instanced the process of collotype as one of those that had half-a-dozen appellations at least, such as Lichtdruck, Phototypie, Heliotype, Artotype, &c. • See our leader in last week’s News.
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