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The photographic news
- Bandzählung
- 29.1885
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- 1885
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- Bandzählung
- No. 1417, October 30, 1885
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The photographic news
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Band
Band 29.1885
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- Register Index III
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702 THE PHOTOGRAPHIC NEWS. [October 30, 1885. to another, and in so doing is mechanically clamped under a negative for the space of ten seconds. At the same moment that clamping takes place two gas jets are turned up, and the light passes through a glass dish, containing water, to the negative beneath. At the expiration of exposure that portion of paper is wound on to the spool of exposed paper, and a fresh surface takes its place. W. W. RoUCH showed his new square camera, in which one striking novelty was observable, namely, the front and back being reversible. By a kind of folding-up movement, the lens can be raised or lowered to any portion of the plate. The Chairman said he could not help admiring the great ingenuity displayed in the production of cameras. T. Samuels drew attention to a camera which contained four screws including that of the tripod, and it was also made suitable for paper work should it be so required. The dark-slides were of the solid box pattern fitted with draw-out shutters, and the grooves were sufficiently wide to admit of the slide being placed in front of the focussing screen. This gentleman also showed the action of his changing-box, and several other novelties. Fox Shew explained the construction and working of a new shutter possessing certain advantages. He also showed a very compact 8 by 6 camera which contained some very neat move ments. A plan of utilizing portions of a large plate was also much admired. J. Copeland and Co. also showed several of their exhibits, among them a valise arranged for changing plates, developing, &c. ; a very compact camera containing several movements ; a new burnisher, in which the tool was somewhat rounded ; two forms of pneumatic shutters, which were not novel; and a con venient box for carrying a two-cell dichromate battery with incandescent lamps attached. London and Provincial PHOTOGRAPIIIC Association. A meeting of this Society was held on Thursday, the 22nd inst., J. Traill Taylor in the chair. A. Cowan showed a gelatino-citro chloride positive, made in February 1883, and referred to at the previous meeting. It had been fixed without toning, and he thought disproved the state ment of H. S. Starnes concerning black images. The Chairman said that the transparency in question was un- mistakeably warm brown in colour. A short discussion followed, in which W. E. Debenham pointed out that the colour of the image after the action of the fixing salt upon silver citrate was the real question at issue ; and A. L. Henderson was of opinion that any image formed with silver citrate would be of a foxy colour when fixed, unless previously toned with gold. A. L. Henderson then passed round the sixty-seconds exposed negative, taken on the last occasion in the Society’s room, by means of the ordinary gaslight. The lens used was one of Suter’s for 9 by 7 plates, open aperture. The Chairman characterised the result as wonderful, and one which led him to think the time was fast approaching when pictures could be regularly made by ordinary gaslight. W. E. Debenham thought it remarkable that even so much as was seen upon the plate could be obtained under the condi tions as they existed. What he thought more remarkable was that a transparency showing so much detail could be obtained from such a negative. Transparencies in wet collodion, and by the exhibitor’s formula on page 398, were also shown. The Chairman then announced that Messrs. Burton and Hen derson being present, they would test whether or not supple mentary exposures would increase the sensitometer reading of gelatine plates. The Hon. Secretary having provided these gentlemen with two packets of a well-known commercial plate, A. Cowan and A. Pringle were by general consent invited to act as umpires. Two preliminary plates were exposed to a very weak light (the ordinary night-light), situated about fifteen feet away, and portions of each plate were acted upon for periods of 5, 10, 15, 25, and 30 seconds respectively. Some disappointment was caused owing to no provision having been made for development, and these interesting experiments had to be deferred until the next meeting. The Chairman observed that many years ago the importance of this subject was recognized by Winstanley, who took out a patent for giving a preliminary exposure of wet plates to a standard candle. A. L. Henderson replied that Winstanley’s agent called upon him to sell a licence, and they exposed plate for plate, with the result that the agent admitted he was beaten. W. E. Debenham then referred to the "Scotellari cap," which was intended to apply the principle of auxiliary exposures to camera work. He however did not and had not recommended auxiliary exposure to be actually employed, but had spoken of its effect in giving a higher sensitometer number without giving a corresponding increase of sensitiveness in the camera. A. L. Henderson again drew attention to the packing of plates, eight of which were shown separated by two clips of tin foil. He suggested pieces of foil wafers for attachment to the corners of the plates ; and in reply to Mr. Burton, said that sheet lead would be more difficult to handle. J. Barker, referring to auxiliary exposure, was of opinion that any light which reached the plate would produce an image if it could be developed, and he hoped three or more forms of development would be used in the experiments next week. W. H. Prestwick spoke of a mixture which was said to accele rate, and he promised to try it before the next meeting. A. L. Henderson had already tested it, but did not find any advantage. He had pitted another commercial mixture against one of his own, and it was impossible to distinguish between the two negatives, which were of splendid quality. He took about 30 minims each of a forty grain solution of sodium carbonate, potassium carbonate, and saturated sodium sulphite. These were added, with two grains of pyrogallol, to one ounce of water. The Chairman remarked that J. Stuart, of Glasgow, recom mended a similar developer, and his negatives were of a remark ably fine colour. In reply to a query, he said the favourite developer in America was a mixture of sodium and potassium carbonates, with sulphite and pyrogallol, very little or no bro mide in a general way being required. Iron development then became the subject of conversation, owing to Mr. Henderson mentioning the solubility of its oxide in the strong alkali, caustic potash. A. Mackie referred to Dr. Eder’s communication, page 659, and several members gave their experiences in this method of reducing ; upon the whole, Farmer's plan with potassium ferrid- cyanide was preferred. Manchester Photographic Society. The thirtieth annual meeting of the above Society was held at the Memorial Hall, Albert Square, on Thursday evening, the 8th inst., the President, Mr. J. S. POLLIT, in the chair. The minutes of the previous meeting were read and confirmed. The Secretary read the thiitieth annual report, of which the following is an abstract: — “ In point of numbers, the position of the Society is con siderably in advance of any previous year; no fewer than twenty-seven new members have been added to the roll, while twelve have resigned, and two have been removed from among us by death, making the total number of names now in the list 138 against 130 at the close of last year. The financial position of the Society, notwithstanding some heavy calls upon the funds, is still satisfactory. The average attendance at our monthly meetings has been nearly stationary, being fifty-four against fifty-one last year. As usual, your Council have to regret the scarcity of papers, demonstrations, and other interesting matter at the ordinary meetings. The pictures shown, although not so numerous as had been expected, showed a considerable improve ment in the quality of the work done by many of the exhibitors, not only in manipulatory details, but in artistic qualities also, and the Exhibition, as a whole, gave great satisfaction to a large number of visitors, as well as to the members. Among other matters of interest brought before the meetings, Mr. Cheetham showed a dark-room lamp constructed to hang from the ceiling, throwing the light downwards, and having a very simple method of changing the colour of the light. Mr. A. Brothers, F.R.A.S., showed a photograph (taken by Mr. White) of a group of young persons, taken by means of the Ethoxo limelight, assisted by magnesium light. Mr. A. Garnet showed a number of continental views taken during holiday tours, and Mr. Greaturex exhibited a somewhat similar series. At the December meeting, Mr. Charles Harris, F.R.G.S, gave the members an opportunity of inspecting a collection of large photographs of the Yosemite Valley, California, collected by him during his tour round the world, and, with the aid of a number of lantern slides, gave a recital of his experiences, and a
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