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The photographic news
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- 29.1885
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- Bandzählung
- No. 1390, April 24, 1885
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The photographic news
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THE PHOTOGRAPHIC NEWS. 271 APRIL 24, 1885. | behalf of canvassers of two or three firms represen ted in the town, whom I am sure you would not wish to suffer under a ban for another’s ill-doings.” Aroceedings of Societies. London and Provincial Photographic Association. A meeting of this Society was held on Thursday, the 16th inst., Mr. A. L. Henderson in the chair. The preliminary business having been disposed of, the Chair man invited Mr. W. K. Burton to deliver his lecture on “ Modern Developers." Mr. Burton commenced by saying that “ Modern Developers ” might be said to have dated from 1861, when alkaline develop ment was first made known. Before this date some acid, always accompanied with nitrate of silver, was employed to build up the image ; but in the year mentioned it was discovered, that if an alkali be substituted for the acid and free silver, an image could be developed, thus preparing the road for the present methods. In 1877, Carey Lea pointed out that alkaline pyro gallol could be replaced by organic iron salts. This form of development the lecturer did not consider the best for plates, but it was better for paper. The question then arose, which alkali should accompany the pyrogallol ? He believed ammonia was used almost invariably, lie then passed round a series of transparencies wherein each of the carbonates had been em ployed. A similar series, which included the caustic alkalies, followed. Forty-eight examples were then shown, in which the proportions of pyrogallol per ounce varied from } to 2 grains, bromide of ammonia to grains, and ammonia } to 4 minims. He then referred to the addition of sulphite of soda, a subject upon which opinions widely differed. So far as his experiments went, he was unable to trace any particular advan tage to its use, neither would he say it was injurious. Hydro- kinone was then spoken of and illustrated ; three grains, to gether with a quarter of a grain of restrainer, bromide of ammonium, being used, the result of which was satisfactors . Hydroxylamine, on the contrary, failed to give an image with any of the caustic alkalies. He had not tried the salt with either of the carbonates, as he assumed the result would also have been nil. All the examples illustrating comparative values of ammonia pyro and bromide, received an exposure of twenty seconds to a duplex paraffin lamp, and were all developed for as much detail as could be obtained from them in half an hour. He did not recommend keeping the stock developer in one solution for obvious reasons, but to show that it was practical, he. passed round examples which had been mixed for a month ; they were of a brown colour, but had not lost any developing power, a fact afterwards satisfactorily demonstrated. The solution was composed of ammonium bromide, pyrogallol, and caustic soda in methylated spirit, the limit being governed by the solubility of the bromide salt. At the conclusion of the lecture, a discussion took place. Mr. A. Cowan preferred the ammonia carbonate to either soda or potash, and instanced the development of plates by a solution which had been kept twelve months, after developing eight plates. He had diluted some developer with sixty-four times its bulk of water, and obtained an image in fifteen hours. Mr. A. Mackie remarked upon the yellowness of the images so obtained, even with one hour's development. Mr. W. J. H. Wellington was in doubt whether another brand of plates would yield similar results to those obtained by the lecturer, since formula differed so much. He had lately been trying Dr. Eder’s sulphocyanide of ammonium formula, and his plates then gave green fog; with sulphite of sola they were perfectly clear. The Chairman called attention to the amount of halation as well as density in one of the examples, and remarked that ferrous oxal ite development was due to Willis rather than Carey Lea. Mr. Burton said it might bo taken as an axiom, that the same plate would increase in halation as it increased in detail. His information regarding Carey Laa was derived from the journals of that time. The Hon. SECREranr showed a plate illustrating the dis advantage of an impure sample of sodium sulphate, a little sulphide being apparently present, and the Chairman illustrated a similar defect, together with red and green fog ; other plates of the same subject developed minus the sodium sulphite were in both these cases perfect. Mr. C. II. Trines pointed out the necessity of testing samples of sodium sulphite for alkalinity, and correcting the same with an acid, to avoid green fog. Mr. Haddon referred to a series of experiments he had con ducted some time ago ; he found that working under exactly similar conditions, some plates gave green fog, and others not. Regarding the preservation of pyro in solution, he had not met with anything so good as sulphurous acid. He dissolved one ounce of pyrogallol in 10 ounces of water, containing } an ounce of sulphurous acid. He had some which had been in solution more than six months, and was now perfectly clear. He used ammonia, and needed no restrainer, as a little sulpihte of ammonia was formed. A vote of thanks was then accorded to Mr. Burton for his interesting lecture, and it was announced that on the following lecturette night Mr. G. M. Satchfield will demonstrate “ Toning and Fixing the Acme Paper.” Chicago Photogkaphic Association. The regular monthly meeting was held on Wednesday evening, April 1st. After the transaction of some routine business, Mr. Greene related some peculiar experiences that had lately- happened to him in the matter of silvering albumen paper. At a recent meeting he had mentioned the fact of his paper curling obstinately; since that time he had been badly troubled with “ measly ’’ prints, and thinking his bath might be weak, he tested it with the hydrometer, and found it to read 42 grains. This induced him to precipitate the silver with chloride of sodium, when, after washing and drying the precipitate, he found that he had 1} ounces of silver chloride from 55 ounces of solution. His theory was, that the nitrate of silver now in the market was largely adulterated with (probably) nitrate of potash, which, not being taken up by the paper, accumulated in the bath, and accounted for the false reading of the hydrometer. To guard against being misunderstood, Mr. Greene said he was well aware that the hydrometer test was unreliable, except with a new bath. Dr. Garrison, in reply, said he believed all the leading makers of silver nitrate furnished a practically pure article, and that adulteration with potassium nitrate was readily detected by the difference in the shape of the crystals of the two salts. He con sidered that the density shown by the hydrometer was legiti mately accounted for by the nitrates formed in the bath by double decomposition between the nitrate of silver in the latter and the chlorides in the paper. Mr. Greene asked how it happened, if this theory held good, that, when he was, for a number of weeks, silvering 100 sheets a day, this trouble never occurred, although he relied on his hydro meter for keeping up the strength of the solution ? Being asked how often he boiled down his bath, Mr. Greene replied that, until this winter, it had not had a thorough boiling for fourteen or fifteen years. He occasionally gave it a slight boiling to coagulate any albumen it might con tain. He added that, since making a new bath, he was no longer troubled with paper curling. Glasgow and West of Scotland Amateur Photographic Association. The usual monthly meeting was held on Tuesday, the 14th inst The following new members were admitted :—Messrs. John. Gillespie, II. B. Collins, and JohnG. Walker. After various letters had been read, The President exhibited and explained Warnerke’s sensito meter, with special reference to Mr. Goodwin’s paper at the March meeting on “ Aids to Correct Exposure.” A short discussion followed, which was taken part in by various members. Mr. W. Lang, Jun. then read his paper on “ Carbon Printing” (see page 263), and developed a number of carbon prints, which were handed round. A specimen of the result on an isochromatic plate was then handed round, and compared with a print from one of Wratten’s plates, and it was considered that any advantage gained in one colour was lost in another colour. As this was the last regular meeting of the season, it was agieed to hold informal 'meetings on the second and fourth Tuesdays of each month at 7.30 p.m. It was also agreed that the Council should procure an album, each member to be asked to contribute prints towards same.
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