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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. 1294, June 22, 1883
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Zeitschrift
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 27.1883
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398 THE PHOTOGRAPHIC NEWS [June 22, 1883. materials, enlargements, &c. (everything concerning photo graphy), the Brussels Photographic Exhibition will afford an excellent opportunity to the makers of these articles to make them known to the numerous amateurs and pro fessionals who will pay a visit to the exhibition. Prices may be marked on the exhibits, and the Committee will undertake to sell them at the usual commission of 10 per cent. A lottery will be organized by the Committee, lots being selected amongst the exhibits (pictures, apparatus, &c., included). If you intend exhibiting, please note the following instructions:—1. Demands for space will be re ceived until the 1st of July. 2. A note should accom pany them, including full information about prices for sale, and the discount you would allow in case of the exhibits being bought for the lottery by the Committee. 3. The description, name, and address should be written legibly, in order to avoid errors in making the catalogue. All communications should be addressed to— Alfred Geruzet, Secretaire-General, 27049, Rue de VEcuyer, Brussels. Proceedings Sucieties. Halifax Photographic Club. At the monthly meeting on Tuesday evening, June 5th, Major HOLROYDE in the chair, w After passing the minutes of last meeting, Mr. Keighley Walton was made a member of the Club. The President said he had received a long letter on “ Photo graphic Experiences ” from Captain F. W. Turton, R.N., of Florence, accompanied by nine photographic views of that place, 8 by 5. Mr. J. Whitely proposed, Mr. Aiderman J. Smith seconded, that the best thanks of the Club be forwarded to Captain Turton for the views, which are to be placed in the album of the Club. The Rev. W. E. Hancock than gave a very interesting and humorous outline of a fishing and photographic tour in the West of Ireland, visiting Galway, Connemara, Loch Corrib, Cong, and other notable places. Having made several salmon and trout expeditions and photographic excursions, he showed some fine negatives taken with his 5 by 4 camera, principally taken with a drop shutter. Mr. W. C. Williams, in seconding a vote of thanks to Mr. Hancocks, said he had had brought home to his mind many episodes of his former days, both in fishing and photographing, and was very much gratified. The Secretary then read over the arrangements for the excursion on June 25th to Bolton Abbey and Woods in Wharf dale. Each member is expected to take his camera: and the nega tives taken, and prints from them, are to be exhibited at next meeting, August 7tn. It was agreed that first and second diplomas should be given both for technical excellence and artistic merit. Mr. Hancock kindly offered during next session to show any of the members’ transparencies for the lantern with his limelight apparatus. Mr. Williams, in answer to a question by Mr. Aiderman J. Smith as to his instantaneous shutter, explained that he could not tell when he would be able to place it before the members as promised. Judging from results already seen by the Club, the shutter was undoubtedly a great success, inasmuch as foreground, subject, and magnificent skies were perfectly rendered on the same plate. Some three years ago the matter of instantaneous shutters received much of his attention, and the shutter in question was the result of many experiments, and it was so con structed as to open at the centre of the lower edge of the fore ground, the whole of the latter becoming exposed ere the sky portion was brought under the influence of light ; the latter no sooner became fully uncovered than the shutter again com menced to close on the sky at the upper edge of the plate, the whole of the sky was again closed, while the foreground remained under the influence of light, and the exposure was completed by the shutter closing as it had opened on the lower edge of the fore ground in the centre. There was no check or reversing action in the movement from beginning to end, and it was worked by a compensating balance, and not by springs, and could be used before or behind the lens. One or two shutters had since come into the market, which he imagined, from the advertisements, involved some features of working very similar to his, and there fore he feared the novelty of his shutter would, in some measure, be diminished. London and Provincial Photographic Association. At the meeting held 14th inst., Mr. A. J. Brown in the chair, Mr. Cowan showed the results of a few experiments which he contended went to prove that the usually accepted theory was correct with regard to drop shutters, viz., that the greater amount of exposure was gained in a given amount of time by using the shutter close to the plate. Mr. Brown showed an ingeniously constructed arrangement, by which he was enabled to use the same shutter either immedi ately behind the lens, or in front of the plate ; and he passed round plates showing that there was no perceptible difference in the result, whichever way he used the shutter. Mr. Cowan explained that the shutter used immediately behind the lens should not be the same as that used close to the plate, but one having an opening proportionate to the aperture of the lens. Mr. Coles thought Mr. Brown's experiments only confirmed those of Mr. Cowan. Mr. Debenham remarked that there would be no difference as regarded the amount of light, and the effect of more or less ex posure. The question was whether, with a moving object in the field, the movement would affect its sharpness more in one case than the other. If the aperture of the shutter was long, there would probably be no noticeable difference; whilst if it was very short, although with the shutter next the plate there would be greater sharpness, yet as the whole of the plates would not be exposed at one time, the parts of the moving object might be represented at different times, and a curious distortion result. Mr. Henderson said that having a batch of emulsion which had “ given way,” he had melted it with fresh gelatine, and had obtained an emulsion much finer, both as to speed and quality, than the original; this led him to make further experiment, and he found that if he took an emulsion and divided it into two parts, allowing one part to set rapidly, and keeping the remainder at a liquid temperature ; warmed up the set portion at a temperature just sufficient to melt it, and coated plates with both, the emulsions which had been set and re-melted gave much quicker results, and if again set and re-melted the results were still quicker. He accounts for this by stating that in his opinion the contraction of the emulsion in cooling and subse quent expansion in heating altered its condition ; and that in an emulsion which ripened by keeping, the result was obtained by its beginning to decompose, which affected the bromide in a similar manner. Postal Photograthio Society. The annual general meeting was held on June 16th, Mr. J. Pocock, the President, in the chair. The Hon. Secretary reported the progress and doings of the Society during the past year. The Hon. Treasurer handed in the balance sheet, which was duly accepted and passed. It showed a balance of £5 19s. 2d. in hand, the receipts for the year including entrance fees and sub scriptions from fifty-two members (£18). The account was signed by Messrs. J. Pocock and Walter Withall as auditors. The officers then retired, as did the three members of the committee in alphabetical order, and Lieut. S. Horton, R.A., who asked to be relieved, as he was likely to be ordered on foreign service. The following were elected to serve for the year com mencing July, 1883 :—J. Pocock, W. M. Baylis, Walter Withall, H. Senier, F.C.S , London; and Surgeon-Major Horace Day, M.D. (Tunbridge), F. C. Cowley (Brighton). H. H. Cunningham and W. M. Baylis were re-elected to serve as hon. secretary and hon. treasurer respectively. A letter was read from Dr. Maguire (Holyhead) pointing out that the competitions would probably be better supported if the prizes were of greater value, and suggesting a contribution of Is. 6d. or 2s. 6d. a head from all members towards the formation of a prize fund. The Hon. Secretary said that they had deprecated infusing a mercenary spirit, as they had hoped the stimulus given by making all the members judges would sufficiently keep the spirit
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