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The photographic news
- Bandzählung
- 29.1885
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- 1885
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- Bandzählung
- No. 1388, April 10, 1885
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The photographic news
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Band 29.1885
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- Register Index III
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THE PHOTOGRAPHIC NEWS. LAPRIL 10, 1885. The Chairman, in closing the discussion, said it would have been more gratifying if the negatives had been made by an English firm. To illustrate the progress made in copying paint ings, he said, thirty years ago Sir J. Herschell and himself had an argument as to whether a certain speck of light, on plate, represented a nose or not, and they decided in the affirmative ; but there was no longer any need of doubt. He then called for a hearty vote of thanks to Mr. Bird for his paper, which was accorded. The next ordinary meeting will take place on Thursday, May 12th, and the next technical meeting on Tuesday, the 28th inst. South London PHOTOCRAPHIC Society. An ordinary meeting of this Society was held on Thursday, the 2nd inst., at the House of the S iciety of Arts, John Street, Adelphi, W.C., Mr. T. Bolas, F.O.S. in the chair. The minutes of the previous meeting having received con firmation, the Chairman called upon Mr. G. M. Satchfield to give a demonstration of the “London Acme” rapid enamel paper. Mr. Satchfield explained that the “ Acme ” paper was in tended for direct printing, which operation took place much quicker than by means of albumenized paper. Toning and fixing occupied no more than two minutes, giving any desired tone, without loss of depth, ranging between a warm silver print and a platinum black; untoned prints yielded an agreeable colour similar to red carbon. He considered a quarter of an hour’s washing ample, and showed examples which had been printed, toned, fixed, washed, and stripped from glass that afternoon. It was especially suited to weak negatives, and apparently perma nent. Examples were passed round in various stages of finishing and rapidity of toning and fixing practically exemplified. The Chairman considered the speed of toning and fixing to be a great advantage; the colour of the untoned prints was really very nice, and an effect which he thought many would prefer. Mr. E. W. Foxlee enquired how much quicker prints could be made than by ordinary silver printing. Mr. Satchfield said about one-third ; but negatives too thin for ordinary paper would give excellent results on the paper described. Mr. F. A. Bridge showed an acme print from a negative he was sure no one could get a silver print from. He toned and fixed it in a minute and a half. Regarding rapidity of printing, he did not think it any quicker than ordinary paper, and illus trated his contention with prints made from each process side by side from the same negative. Mr. Foxlee expressed a doubt regarding the permanence of the prints shown, since organic compounds would be absorbed to an extent by the paper ; in any case hypo would be absorbed. The Chairman said there was no objection to washing the paper a longer time. It was interesting to note how the gelatine pro cesses were pushing forward all over the photographic world ; whether it would revolutionize printing as it had negative work, he should not say at this stage. Mr. .Satchfield and others had made many experiments in that direction, and obtained promis ing results. One thing was evident: there was a better result obtained from thin negatives, and photographers would not be slow to recognize this feature, and regulate the density of their negatives accordingly. Speaking of gelatine prints generally, he thought they offered a better surface for working up than albumen. A short discussion on the suitability of various papers for photographic purposes then ensued, after which the Chairman called upon Messrs. Morgan and Kidd to exhibit the capabilities of their “new paper for negatives.” Mr. Kidd commenced by reading a short paper (seepage 234), upon the conclusion of which he successfully demonstrated the mode of making enlarged negatives upon bromide paper, using ferrous oxalate as the developer, the result being highly satis factory. Several paper negatives made in the field, and prints therefrom, were passed round. Mr. Kidd explained that the paper was placed between two plates of glass for exposure in the camera, and he further said that by straining the paper over cardboard, and doubling the same outwards, two perfectly flat surfaces were obtained. Mr. Jerrard Smith had made very many paper negatives in the manner described, and quite agreed with Mr. Kidd that it was not advantageous to render the paper transparent with castor oil or other greasy substances ; if it were possible to use any other substance, it would facilitate printing. Mr. FoxLEE advocated paraffin. Had its virtues been known, he said, in the early days of paper negatives, castor oil would not have been used. The Chairman agreed with the previous speaker, and said that a good sample of paraffin, that would melt at a high temperature, such as ozokerite, would not communicate the slightest trace of grease to the print. He then mentioned the old Talbottype plan of drawing down the sensitive sheets for exposure. Mr. Bridge thought a more perfect method of exposing was necessary than at present. Mr. H. Wilmer suggested packing a number of sensitive sheets into a block like a blotting pad. Mr. C. Poirson submitted that if the backs were coated with plain gelatine, it would obviate the present tendency to curl inwards. The Chairman referred to the great advantage to be derived by foreign correspondents and others, who could now send home their negatives by post with less risk, and, as they had just wit nessed, quite as perfect as glass. Storing was another considera tion. He called for a hearty vote of thanks both to Mr. Satch- field and Messrs. Morgan and Kidd, which was accorded. The next ordinary meeting was announced to take place on Thursday, May 7th. The proceedings then terminated. London and Provincial Photographic Association. At the usual weekly meeting of this Society on Thursday, the 2nd inst., Mr. A. Mackie occupied the chair. Mr. A. Cowan exhibited his combined camera and changing box. The camera shown was made for 4 by 4 plates. Two boxes were ranged on each side, being together the same length as the case containing the camera. The two front boxes were fixed to the camera ; these opened in front with spring lids, and could be used for carrying extra lenses or other pieces of apparatus that might be required in a day’s outing ; to these were hinged the other two boxes, one for the unexposed plates, the other for the plates after exposure being connected with a carrier running across the back of the camera, by which the plates travelled pro pelled by a sliding arrangement, first being brought into position for exposure, then passed into the box on the other side. To focus, the two boxes containing the exposed and unexposed plates with the connecting carrier were turned back on to the top of the two boxes in front, leaving the screen free for observation ; the screen being hinged at the bottom, was let down previous to the two changing boxes being brought back to their place. The screen, by an ingenious swing arrangement, was made to turn inside the camera when packed for travelling. The focussing was done by means of a screw in front of the camera. The changing boxes in the exhibit were made to hold fifteen plates. Mr. A. L. Henderson showed a coating machine that he had made, similar to one he had seen exhibited at the Edinburgh Photographic Society on the occasion of his recent visit. It consisted of a trough to hold the emulsion, with two india-rubber rollers, one roller resting on the other, the lower one being partly in the emulsion, the paper was wound on the upper one and drawn between the rollers. It was found in working on Thursday evening that the rollers did not allow sufficient emulsion to remain on the paper. Mr. Henderson explained that he had not tried the machine before bringing it down to the meeting, and that with the one he had seen at the Edinburgh Society, size was used to experi ment with. Mr. W. E. DEBENHAM thought that the rollers were pro bably too heavy ; he suggested suspension sockets to take off the weight of the rollers. A letter was read from Mr. W. K. Burton, altering the date of his lecturette to the 16th inst. Glasgow PHOTOGRAPHIC Association. The annual business meeting of the Society was held in the Religious Institution Rooms, on Thursday evening, 2nd April i the President (Mr. A. Robertson) occupied the chair. Mr. War. Lang, Junr., read a paper on “Photometry, or Test ing of Light Values ” (see page 235), which he illustrated by diagrams, and showed by the use of various photometers the manner in which the illuminating power of any artificial light was arrived at. He also described the new mitrailleuse oil lamp,
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