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The photographic news
- Bandzählung
- 24.1880
- Erscheinungsdatum
- 1880
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- Englisch
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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. 1139, July 2, 1880
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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
Band 24.1880
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324 THE PHOTOGRAPHIC NEWS. LJULY 2, 1880. The Rev. H. J. Palmer said that he had tried this plan re peatedly, but had found it unreliable, since the film occasionally- declined to be separated from the glass surface. He had also tried wax in methylated spirit, and French chalk, as substrata ; but these also could not be depended upon to fulfil the desired object; whereas the ox-gall was unfailing, Mr. Kirkby asked if Mr. Palmer still adhered to his former doctrine, that it was necessary to compose the emulsion with thirty grs. of gelatine to the ounce, in order to secure homogeneity be tween the supporting and sensitive films. Mr. PALMER thought it was theoretically better that there should be the same proportion of gelatine in each of the films, in order to avoid the difficulty of curling in the developing dish. At the same time, he admitted that in the last prepared batch of films he had used an ordinary twenty-grain emulsion upon a thirty-grain support without inconvenience. An outdoor meeting was then arranged for the third Saturday in July at St. Michael’s Hamlet, in acceptance of a kind invita tion from Mr. Wilson. The meeting then adjourned. Glasgow Photographic Association. A special general meeting of this Association was held in Religious Institution Rooms on the 17th of June, to receive th 0 new rules of the Association, with the relative rules for artistic competitions, framed by the Secretary, and approved of by the council, Mr. John Urie, the president, in the chair. After careful consideration the meeting made some additions to and alterations in the rules, and ratified the same, as so altered, as the rules of the Association, and instructed the Secretary to have them printed, and a copy sent to each member. The meeting then proceeded to consider the resolution of council as to the proposed competition among the members, and the regulations framed therefor. After long discussion the meeting unanimously resolved :— 1. That there be four competitions; viz., two competitions confined to amateur members—one in landscape, and one in figure; and two competitions open to the whole Association— one in landscape, and the other figure. 2. That each picture, bearing a motto only, accompanied by an envelope bearing a similar motto outside, and containing proper name and address, must be sent to the secretary on or before 1st November next. 3. That the envelopes bearing the mottoes of the winning pictures be opened by the judges, and the names of the winners declared by minute, signed by the judges. 4. That the size of the pictures in landscape be not less than half-plate, and in figures same size, but the figures must appear as the principal subject in the picture. The pictures must be taken direct from the negative, and are not to be retouched. 5. That three gentlemen, not necessarily members of the Asseciation, be appointed by a general meeting to judge the pictures, and determine all matters relative to the competition, the competitors, and the exhibits; and their decision in all matters shall be final and conclusive. 6. That a first prize be given for the best picture in each com petition. The prizes will be silver medals. 7. That the pictures be obtainable by the owners if called for within one month after intimation given to that effect in a circular calling a general meeting. Unclaimed pictures shall become the property of the Association, and the envelopes bearing their mottoes shall be destroyed, unopened, by the secretary in presence of the council in meeting assembled. Persons claiming pictures must hand the secretary a duplicate of their name and address as contained in the envelopes bearing their mottoes. On opening, the secretary, if satisfied with the claim to ownership, to return the picture; if the secretary is not satisfied, the claim shall be referred to the council for final decision. 8. That the Association have the power, if they think proper, of printing and presenting to the members copies of the exhibited pictures, or any of them, for which purpose they shall have the right to the use of the negative ; but it shall be returned to the owner after the requisite number of prints are obtained from it. The President announced that he would give a silver vase for the best picture exhibited in the whole of the competitions. The meeting therefore resolved that the picture gaining the president’s prize should be excluded from competing for the other prizes. The meeting unanimously awarded the president a vote of thanks for his prize. On the motion of Mr. Dodd, seconded by Mr. Gardner, the ) meeting unanimously resolved that a roll, showing the names and addresses of the members of the Association as at this date, be printed and a copy sent to each member, the roll to be made up from the treasurer’s book. o Goxrespouents. A. B. T.—We can only answer your question approximately ; you should have given the equivalent foci of the lenses. Assuming No. 1 requires 20 seconds, with the full opening, then No. 2 ,, 2 ,, No. 3 „ 3 „ No. 4 „ 62 „ Edward T.—The chloride of gold requires neutralising, because it usually contains hydrochloric acid ; carbonate of lime or chalk does very well. Payne Jennings employs the ordinary acetate bath, with sometimes a little carbonate added. W. II. P.—The question of fixing is one fraught with considerable difficulty. According to Herschel, three parts of crystallized hyposulphite will dissolve about one part of chloride of silver. But, unfortunately, there are two different silver compounds formed by the action of hyposulphite on the chloride, and in the presence of an excess of the latter, strangely enough, less is dissolved. Another point is, that you do not know how much chloride there is on a sheet of paper, for the contents naturally vary with cir cumstances. For careful work, one ounce of hyposulphite per sheet has often been recommended for fixing, and we ourselves prefer this proportion, although it is a little extravagant compared to that you mention. You must remember that the hyposulphite solution gets weaker by use and by keeping; but you might, if you like, preserve it for twelve days in the way you mention, taking care to allow a longer time for fixing. Your printing bath should give you no trouble, and turning colour should have no injurious effect on prints. See answer above. W. M. R.—We have had no difficulty in getting sheet gelatine, large quantities being made for bonbons, &c. If you cannot get it through a photographic dealer, try Mr. J. Green, 44, Ridley Road, Dalston. A. A.—1. If you like. 2. No lens should have a stop with a diameter less than one-fortieth of its focal length. Enamel.—Look in our " At Home ” this week. M. Liebert’s plan of enamelling is certainly a good one. There are several firms who undertake the work, as you will see in our advertising columns or we can refer you to a Paris house if you like. Gelatine.—1. Immersion in methylated spirit is the best remedy we know ; it hardens the film and renders it more capable of sus taining severe manipulation, or it will contract the film and restore the same, supposing the gelatine to have lifted from the plate. 2. Mr. Payne Jennings recommended it some time since; he always prefers to collodionise his gelatine negatives rather than varnish them. A Working PHOTOGRAPHER.—Your questions have been inserted in the form of a letter, which will appear next week. W. G. H.—Wo frankly say we don’t know how you can improve the lighting ; the results are so good that there is very little room for improvement. Gelatino-bromide plates well handled will give you as good results, but few studios have adopted them regularly, or, in other words, abandoned the silver bath. See our Corres pondents’ column last week about Snow. We should certainly advise you to make an essay of gelatine. James Neville.—You will find two valuable papers on the subject of photography and wood-cutting in the News of 3rd Jan. and 6th June, 1879 ; our Publishers can supply you with them. P. F.—See Dr. Eder’s paper in last week’s News ; if you have very much over-expssed, the solution of your difficulty is there described. A. Read.—See our loader on positives and “At Homo’’last week. You cannot do better than employ the gelatino-bromide paper. H. Grant.—Standard silver contains 7*5 per cent, of copper, so that you have a considerable quantity of copper dissolved With your silver. You must be careful how you maninulate, for the operation is one that needs the skill and knowledge of 4 chemist. The crystals are of no value at present; you mus dissolve again, and separate your silver by the addition ofhyd chloric acid. The precipitate will be chloride of silver, Whi you must separate and reduce, and further dissolve again 1j nitric acid. But when you get your chloride you would do wo to hand it over to an assayer to be worked into nitrate. It "in not be worth yonr while to make iodizing solution to add top a collodion. W. G. H.—The registration fee for each would be Is. 6d. . GOUGALUM—NORMAN May—A Countryman,—Shall appear our next.
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