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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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Band 27.1883
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- Titelblatt Titelblatt I
- Register Index III
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Band
Band 27.1883
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560 THE PHOTOGRAPHIC NEWS. [August 31, 1833. Ualk in the Studio. The Chairman thanked Mr. Warnerke for his interesting remarks and for the good news he brought. Mr. Dresser enquired from whom a supply of hydrokinone could be obtained, and asked for information as to its employment. Mr. Cowan remarked that he had several times used hydro kinone, but could not find that it possessed any advantage over pyrogallol as a developer for gelatino-bromide plates. The Chairman stated that hydrokinone could be readily obtained from Hopkin and Williams or from Burgoyne. A Member stated that recently he had purchased it as low as two shillings an ounce. Mr. Blanchard, touching the development of over-exposed plates, said he had little doubt that even plates which had re ceived a most prolonged exposure in the camera could be saved, if treated judiciously. By having recourse recently to a very weak developer, with a minimum of ammonia, he had succeeded in getting pictures from gelatine plates that had probably been exposed twenty times as long as they should have been. The Chairman called attention to the fact that the last day for sending in pictures to the Pall Mall Exhibition was Friday, the 28th September, and then adjourned the meeting. WooDBURYTYPE Moulds by the Rollins Method.—The rolling press has been repeatedly proposed as a means of making the leaden mould for the Woodburytype process, but it does not yield a sufficiently flat block to be of much practical use. If, however, the distorted leaden mould is laid on a perfectly flat surface and cautiously heated, a point is reached when it settles down to an approximately true face ; so true, indeed, that this mould may be used for some kinds of work. A fundamental difficulty which seems inherent to the process when thick lead is used, consists in the lateral extension of the metal, the relief being thereby strained; but in Mr. Woodbury’s Stannotype process this difficulty is overcome by reducing the thickness of the metal to a minimum. Excellent work has been done by Wo dbury’s latest method, and the expensive hydraulic press is not required. The tin-foil gives a better working face than lead. Photographic Club.—The subject for discussion at the next PHOTOGRAPHS REGISTERED. Mr. F. Downer (Watford)— Photo of Mrs. Roberts. Mr. J. V. Hatch (Slough)—Photo, of the Ruins of Dr. Boyd s Asylum, Southall Part. .. . , Mr. W. CLaYroX (Leicester)—Photo, of Sir I. ft. John Halford. Mr. R. Kerne (Burton-on-frent)—Photos, of Sir M. A. Bass and Officers of 2nd North Staffordshire Rifles, meeting of this Club, Sept. 5th, will be :“ The Slide Rule as applicable to Photographic Calculation.” On Saturday after noon next, the Club will have an outdoor meeting , at Kew Bridge ; will meet afterwards at the “ Star and Carter.’’ T London and Provincial Photographic Association. At the meeting held on Thursday, 23rd inst., Mr. J. J. Brigin- shaw in the chair, It was announced that M. Hutinet and Professor Stebbing had promised a demonstration with gelatino-bromide paper prepared by the former gentleman. Mr. F. Piper, of Stoke Newington, was elected a member of the Association. Mr. Haddon passed round a tube containing a small quantity of waste emulsion, which had been boiled with carbonate of potash, sugar being afterwards added ; this, in his opinion, was simply green fog in a liquid state, and he asked the opinion of the meeting thereon. In answer to questions, he said that the colour was discharged by the addition of chromic acid, a yellowish precipitate being formed. Hydrochloric acid had very little effect, and nitric acid none at all. Mr. Henderson said a simple test would be to mix a small portion with gelatine, and if the colour was insoluble in hypo or cyanide, then it was green fog. Mr. DEBEXHAN showed two slips of tinted albumenized paper as illustrating the unreliability of such paper. Though they had been exposed to light for only four days, the colour (pink) had in one case almost entirely faded, and in the other had slightly reddened. . Mr. Henderson, referring to a discussion which took place at a previous meeting, as to the length of time necessary to pre cipitate bromide of silver in an aqueous solution, said he had found by experiment the action was hastened by dilution. Thus, if, for instance, he used two drachms ammonia, and neutralised with sulphuric acid, the lipening action was stopped, and in twenty-four hours all had precipitated, and the top of the solution could be poured off perfectly clear, the acid destroying all trace of meta-gelatine, and diluting the solutions at the same time. In last week’s report of Mr. Henderson’s formula, for “made up to three ounces,” read “ thirty-seven ounces.” UD Goxxesgudents. J. J.—We quite agree; it would be better as you say. Unfor tunately, it is the law, as at present laid down. Indian Amateur.—See article by Major Waterhouse in the Year-Book; you will see he speaks of “London/' “Challenge,” “XL,” "Biitannia," and “Pall Mall.” “Instantaneous” appear better than “ Ordinary,” he says. Chas. Search.—There is no work especially devoted to the subject, but all needful information may be gathered from back numbers of the Photographic News, and from the last YFAR-BOOK. W. G. H.—We cannot tell you if it has been registered ; but there can be no doubt that the print you enclose is a copy of the photo graph. You should make a claim. Opal Painter.—It is quite possible that the colours may have con tained lead, and that this has become converted into sulphide by the action of the air. This is, however, a conjecture, but we might be able to form a decided opinion if we were to see the specimens. C. J.—1. No, but it will keep longer than if no acid were used. 2. They are not myths, by any means, but they certainly would not take an order for one hundredweight. If you only want this quantity, you will probably have to pay about 3d. or 4d. per lb. Write to Burgoyne and Co., Coleman Street, London, E.C. James Menssly.—If yon are, as you say, a subscriber, why not look through the back numbers yourself C. C. Lyon.—It would please us to be able to do it, but many are so long and so circumstantial as to render it impracticable. Enquirer.—Your difficulties are due to the circumstance that the studio is not high enough, and it appears that there is no alterna tive but that which you suggest. 1. If the plate is well washed to free it from all traces of developer, such a course becomes just practicable ; but it is never advisable unless circumstances render it impossible to do otherwise. 2. In ordinary cases they do, when the same amount of contrast is required. 3. Alone, in distilled water. 4. In all probability no difference worth mentioning would be noticeable. 5. The latter. 6. See the Formulary. 7. They will probably be republished in book form. 8. It has been recommended, but we have not found its use to be advantageous. Guilio Rossi.—Occasionally the same thing has happened in our hands, and we have attributed it to an incipient decomposition of the gelatine. Gelatine appears to be especially prone to putrify when a thunder-storm occurs. A trace of decomposed gelatine arising from the use of imperfectly cleaned vessels will frequently cause mischief. II. D. H.—Perhaps the corners were so shaded or covered as to prevent the free circulation of air against them. To verify this conjecture, dry a plate of half the size in the same box. F. Jorgenson.—We believe Messrs. Negretti and Zambia, Holborn Viaduct. A Subscriber.—1. Perhaps you had better be content with one capable of working up to 12 by 15. 2. There should be none. 3. We prefer it. 4. There is no necessity, as all that is required to be done is more easily accomplished by shifting the original in its frame, and keeping it in position by small wedges of wood. 5. Speaking generally, they can. W. H. W.—Two drachms to each batch of stock” wiilbe suffi cient. H. G. C.—If you wish to obtain the best results, you cannot work with thinner films. F. P.—It looks like collodio-cbloride paper, but you can tost it by pouring a little ether on it, which will dissolve the enamel if it is collodion (see an article by Mr. Bruce on page 515 of the present volume). A. Dando.—Mr. Philip Magnus, Gresham College, London, E.C. Thos. Garside.—Thanks for your note. We will ascertain the particulars. Constant Reader.—If you use hot water, it will certainly dis solve, but its solubility may be very much diminished by adding sulphate of soda or sulphate of magnesia (Epsom salts) to the water. P. C. T.—All you have to do is to exclude the light; why not paste brown paper over the chinks ?
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