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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. 1288, May 11, 1883
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The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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302 IHE PHOTOGRAPHIC NEWS. [May 11, 1883. bands imposed upon black velvet, and arranged upon a convex surface in the same order as they appear in the solar spectrum, which he had photographed in such a manner as to give the relative value of each colour in light and in shade ; and he dis tributed amongst the members copies of a photographic chart by the collotype process, illustrating the results of his experi ments with wet collodion and gelatine plates respectively. One point on which he sought information was as to the relative sensibility of iodide and bromide with respect to colour. From the results of his experiments, he was of opinion that no modifi cation of the collodion process would give the brilliancy and softness of a gelatine plate. Mr. Sawyer then called attention to a difficult colour subject which he had been working upon, an oleograph representing the interior of a village school, and which he had chosen for its very unlikely capabilities for photo graphic rendering. This he had photographed with collodion wet plates, and also with gelatine dry plates ; the former with thirty minutes* exposure, the latter ninety seconds, and he handed round for inspection the negatives, calling attention to the abso lute invisibility of the deeper portions in the collodion negative, while quite apparent in the gelatine one ; also to the fact that in the collodion plate the black board came out lighter than the schoolmaster’s coat of light green, whilst in the gelatine plate the proper gradations were observed. He remarked that there was much more softness in the dry plate, and there could be no doubt that gelatine plates provide the best means of photo graphing colours, and concluded by expressing his conviction that a discussion of the subject amongst the members would be a valuable contribution to the proceedings of the Society. Mr. Leon WARNERKE thought Mr. Sawyer’s paper was an exceedingly valuable one. One point which would be patent to everyone was that the colours were arranged semi-circularly, giving the screen the appearance of a cylinder, and in the gela tine plate they would notice that the line forming the cylinder was unbroken. It would also be observed that there were two salts used, iodide and bromide. Some seven or eight years ag o he had made some very careful experiments with regard to the action of different bromides in collodion emulsion, and had been struck by the influence of different salts in the representation of colour. He had found that different bromides used in exactly the same proportion produced marked differences, and the non- actinic yellow, orange, &c., was best represented by using sodium bromide, which he had found to be the most sensitive with these non-actinic colours. Mr. W. Bedford thought it was necessary to bear in mind which gave the best gradations, wet or dry plates. In examining Mr. Sawyer’s chart, he noticed there was a much better grada tion of shades in the dry plates, but the gradation of lights was better in the wet plates; what was required, he thought, was a combination of the two, and he believed his would serve to explain some of the different results produced on dry plates in photographing landscapes, in which it was most important to get gradations of lights as well as shades. Mr. Debenham held that the colour gradations of iodide and bromide of silver had been very much exaggerated. He thought the gradations of tone in the different examples with respect to each individual colour was not the same. This might be caused by the negative itself being exposed under brighter conditions of light in the one case than in the other, thus giving greater rotundity of cylinder. Mr. Paine Jennings thought everyone would admit, looking at the colours as a whole, that the gelatine plate only had the advantage in point of rapidity, and that the wet collodion plate gave decidedly finer results. Captain Abney drew attention to the pale yellow colour in the screen, which gave a blacker baud in the chart in nearly every case, and also remarked that the orange came out lighter than might be expected, the reason of which, he thought, was that it was a dye which is fluorescent, and these rays made the colour photographable, which otherwise it would not be. The same observation would apply to the scarlet. With regard to what Mr. Warnerke had said about the different bromides, he thought the great distinction between them lay in the fact as to whether the bromide was foi med from a monotonic or a diatomic metal. With regard to gradation in the high lights, he was of opinion that with gelatine plates gradations were to be got which were not obtainable with wet plates. Mr. V. Blanchard suggested that, in making further experi ments, Mr. Sawyer should try the extremely strong baths used by the Americans, and thought he would find a difference in the scale of gradations. Mr. Sawyer, in response to an invitation from the Chairman to offer some remarks on the discussion which had taken place, said that with regard to bromide of sodium, as mentioned by Mr. Warnerke, he had not tried it, but should have much pleasure in doing so. He was certainly astonished at the behaviour of am monium iodide, and thought he would yet be able to demonstrate that it will produce as good an effect as a wet plate with any combination whatever. He thanked the meeting for the patience with which they had listened to his paper, and hoped the subject would be taken up. The Chairman called for a vote of thanks to Mr. Sawyer, which was carried with acclamation. It was announced that the Society's exhibition of pictures will open with a soire on Saturday, October 6th, further details of which will be announced next month; also that the next technical meeting will take place on 22nd inst. The meeting was then adjourned till Tuesday, 12th of June. South London Photographic Society. The ordinary monthly meeting of the above Society was held in the House of the Society of Arts, John Street, Adelphi, W.C., on Thursday evening, the 3rd inst., the Rev. F. F. Statham, M.A., President, in the chair. The minutes of the previous meeting having been read and confirmed, Mr. John H. Knight, proposed by Mr. F. A. Bridge, and seconded by Mr. Harman, was elected a member of the Society. The Chairman announced that for the artistic competitions this month only three examples had again been sent in, all of which were in competition for the “landscape subject,” “A Shady Nook,” no one having attempted the “ figure ” competi tion of “ Dignity and Impudence.” The members then adjudged the relative merits of these three pictures in the usual way, and Mr. E. Dunmore was announced as the successful competitor for the mouth. The subjects for the present month’s competition were then balloted for, with the following results :—Landscape, “ An Open View with Good Clouds ” ; and Figure, “ Cattle.” The Chairman said it had been suggested that members should bear in mind, when proposing subjects for each month’s competition, the appropriateness of the season to the subject proposed, and cited as an illustration of the unsuitability of some of the proposals drawn from the hat, an instance in one of the early months of this year, where “ Cattle in Water” had been suggested as the landscape subject at a time when the weather was so cold that it was scarcely likely that cattle would be accommodating enough to stand in the water for the benefit of a photographer. He announced that the pleasant duty now devolved upon him of presenting the silver medal of the Society to the successful competitor in last year’s artistic competitions, Mr. E. Dunmore. In handing to that gentleman the medal, ho remarked that this was the second year in which Mr. Dunmore had gained it, and he thought it had been well earned and deserved. Mr. Dunmore briefly thanked the Chairman for his remarks, and said that perhaps if more of the members had exerted them selves to compete, someone would have been found more worthy than himself to receive the medal. The Society’s diplomas were also presented to the following gentlemen whose pictures had been adjudged to possess the greatest merit amongst those sent in for competition this yearMr. W. Cobb, “ The Gardener ”; Mr. John Nesbit, “A Rural Spot ” ; and Mr. W. Brooks, “ Sunshine.” Mr. F. A. Bridge then read a paper, entitled “ Lenses, Cameras, and Stands for Small Work ” (see page 294), in which he com menced by expressing a partiality for two “ families "of lenses, viz., Ross's portable symmetrical, and Dallmeyer's rapid recti linear, and pointed out that the first five or six of the former and the first three of the latter could be used with the same flange. With a view, however, of showing what might be done with less expensive instruments than the above, he passed round for inspection a frame of prints taken by cheaper lenses varying in prices from €4 10s. to 5s., and with focal lengths varying from 2} to 7 inches, which he thought would show the possibility of getting fairly good pictures even with lenses costing only a few shillings. With regard to cameras, he (Mr. Bridge) showed one made for him by Mr. G. Hare, with swing-back and focussing capacity from 2J to 12 inches, which he considered the most perfect he ever saw. He also showed a new quarter-plate camera with extending front by Meagher, a lantern slide camera by Smith for 34 by 34 plates, with a “ swing-any-way ” back and
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