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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. 1276, February 16, 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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110 THE PHOTOGRAPHIC NEWS. [FEBRUARY 16, 1883. affairs of the Society were so well administered. The motion was carried with acclamation. Votes of thanks were also passed to Messrs. Ackland and Addenbrooke for their services as auditors. The Chairman then alluded to the great services rendered to the Society by Captain Abney as Editor of the Journal, remark ing that that gentleman was like a sponge—you had only to squeeze him, and you got what you .wanted out of him. He asked for a cordial vote of thanks to Captain Abney, which was heartily responded to. Colonel Stu Abt WoRTLEY said he thought the thanks of the members were also due to their President for his exertions in their behalf. He (Col. Wortley) had now attained his majority as a member of the Society, and though during a great part of that time he had been a member of the council, he only once or twice remembered the president to have been absent from his place. He begged to propose that a very warm vote of thanks be passed to that gentleman, and expressed a wish that he might long continue amongst them to hold the office of president. Captain Abney said that after the eloquent speech they had had from Colonel Wortley, he would not attempt to add anything to what that gentleman had said. He (Captain Abney) had only been fifteen or sixteen years in the Society, but during that time he had seen how ably their president had conducted their meetings, and he thought, had they had a less worthy chairman, the Society would not have the position it now held. He begged most heartily to second the vote of thanks, which was responded to with acclamation. In returning thanks, the President assured the meeting he had always done his best to forward the interests of the Society, and should continue to do so in future years, although, perhaps, at his age, he could scarcely look forward to very many years amongst them. While he was spared he should, however, always feel a very deep interest in the welfare of the Photographic Society of Great Britain. The result of the election of officers of the Society for the current year, to fill the places of those retiring, was then announced as follows President—Mr. James Glaisher, F.R.S. Vice-President—Mr. H. Baden Pritchard, F.C.S. Treasurer—Mr. W. S. Bird. JUembers of Council (in alphabetical order)—Messrs. W. Ack land, V. Blanchard, T. Sebastian Davis, F.C.S., Payne Jennings, H. P. Robinson, and J. W. Swan, F.C.S. The Chairman said the task of scrutineer required a great deal of order, arrangement, and care, and asked for a vote of thanks to Messrs. Cowan, Burton, Woods, and England for acting in this capacity. This being carried, he (the Chairman) announced that the progress medal for 1883 had been awarded to Mr. W. B. Woodbury, for improvements comprehended under the name of the Stannotype process. In presenting Mr. Woodbury with the silver medal of the Society, the Chairman expressed the pleasure it afforded him to do so, and said he thought he remembered the occasion of Mr. Woodbury receiving his first medal some twenty-nine years ago at Melb urne. The present medal was the outcome of Mr. Woodbury’s labours during the past thirty years, and, in presenting it to him, he (the Chair man) thought it was the highest honour the Society had in its power to confer upon Mr. Woodbury. Mr. WOoDBURY having briefly responded, D Captain Abney then read a paper entitled “ Silver Flashed Glass for Dark Rooms,” in the course of which he remarked that some short time ago Mr. Bolton had kindly given him a specimen of soaked silver glass for use in the dark room, which he believed was at the time considered to be an excellent medium. It occurred to him, however, that it might not be all that was necessary. Its appearance by transmitted light was similar to what was known as “ stained orange.” He took three photographs—one by electric light, with the diffraction grating ; a second with a pair of prisms ; and a third by solar light, from which he found that one of the carbon bands in the ultra-violet passed through. On comparing these with bichro mate of potash, they had very much the same appearance in the spectrum. From the green upwards, he found bichromate cut off everything, and was, therefore, very much safer. He thought it might interest some of the members to see really what action ordinary glass had upon the spectrum, and for that purpose he handed round two photographs for inspection. He Baid it happened that where the glass cuts off the ultra-violet light, there the solar spectrum practically ceased; it was useless to use quartz lenses for solar light; the same ending of the spec ¬ trum could be got up to whatever height you go. One more point he wished to mention. They had lately been introduced to a material known as “ cherry fabric ;" this was only to be trusted when employed with orange paper. Red book-binders cloth let some green light through, though not so much as the cherry fabric. With regard to the soaked silver glass, he found it was only to be trusted for collodion, as it was possible to print right through it. Mr. John Spiller said he had had some experience of the cherry fabric, and it struck him they should have a double layer in order to use this material Safely ; there should be no direct light passing through the interstices. Mr. T. Sebastian Davis thought the point was, through what medium the largest amount of light could be obtained. Mr. Leon Warnerkb had had some experience of bookbinder’s cloth, and found that six thicknesses were necessary. Captain Abney scarcely thought that two thicknesses of fabric were insufficient. It must be remembered that a very small quantity of light was being dealt with. The slit he used was one five-hundredth part of an inch broad, and that was spread over three inches, so that the amount of light was very small com pared with direct sunlight. Mr. Davis had said you must get the largest amount of light with the smallest amount of actinic action. He (Captain Abney) quite agreed with him in this. He thought Mr. Warnerke’s experience was very interesting; also that if the cherry or bookbinder’s cloth were used, combined with orange paper, he thought the most perfect protection possible would be obtained. Mr. WARNERKE said from several experiments he had made, he found that nothing was better than picric acid for producing yellow fabrics. A vote of thanks was passed to Captain Abney. It was announced that the next monthly technical meeting would be held on February 27th. The meeting was then adjourned to Tuesday, March 13th. London and Provincial Photographic Association. At the meeting held at the Masons’ Hall Tavern, on Thursday, the 8th inst., Mr. Alexander Mackie in the chair, Mr. A. L. Henderson, referring to the specimens of “ fil- graue ” shown at a previous meeting, said that Mr. Woodbury had informed him that the image would be removed if the paper was immersed in water. He (Mr. Henderson) proposed several specimens, one of which had been immersed in water, and in which the impression had almost disappeared ; another had been immersed in a solution of one grain paraffin wax to an ounce of benzine, and then placed in water for the same time as the first specimen ; in this case the image was intact. Mr. Haddon thought that the transparency was caused by the fibres of the paper being crushed by the pressure. He then read a paper entitled, “Freeing Emulsion from Soluble Col loids” (see page 108), and a discussion ensued. Mr. Henderson said that to each ounce of “ leucine,” he added three grains of iodide of potassium ; he had made an ex periment by dropping on to a piece of glass a small quantity of “ leucine ” that had not been dialysed, and some that had been dialysed through a piece of pure parchment; on evaporating there was a slight gelatinous residue on the glass, while in the other case there was not. Mr. Haddon said that according to “ Watts,” there were two forms of colloids, viz., soluble and insoluble. Mr. Barker thought it was not advantageous to use alcohol in an emulsion, as it disorganises and decidedly decomposes it. He had a batch of plates which had been in the damp and got sticky, but on baking them they seemed to have come to no harm, as they gave good results and did not frill. Mr. Coles asked (showing a chloride of silver image) what was the best way to develop it. It had been stated by Mr. Henderson that, having over-reduced a dense negative by ozone bleach and chrome alum, he had re-intensified with bichloride of mercury, followed by lime water. The Chairman thought probably the ferro-citrate developer would be the best for the purpose. Mr. Haddon said the theory of bichromate intensification was that the bichromate of mercury in the presence of metallic silver parts with a portion of its chlorine, converting the silver into chloride of silver, the corrosive sublimate itself becoming reduced to calomel; the action of the ammonia being to convert the calomel into oxychloride of mercury. If the whole of the silver be converted into chloride, it is impossible for any intensi- fication to take place.
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