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The photographic news
- Bandzählung
- 35.1891
- Erscheinungsdatum
- 1891
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- Englisch
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1703, April 24, 1891
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The photographic news
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328 THE PHOTOGRAPHIC NEWS. [APRIL 24, 1891. Mr. WEIR Brown exhibited some sepia-toned bromide prints; the toning bath used was— Nitrate uranium ... ... ... 100 grains Ferridcyanide pot. ... ... 100 grains Water ... ... ... ... 24 ounces The remainder of the evening was occupied with discussing the rules of the forthcoming lantern-slide competition, which was fixed for the second Thursday in October. HOrBORN Camera Club. At the usual weekly meeting of this Club on Friday last, Mr. Fred. Brocas gave an instructive lecture on ‘ ‘ General Hints to Beginners,” dealing with the numerous stumbling-blocks which seem to enter into a compact to frighten a beginner. He specially mentioned the matter of foreground ; under-exposure was also dealt with at great length. Most beginners, he said, always under-expose. It was much better to over-expose, because, by judicious development, a fair negative may be obtained from an over-exposed plate, but an under-exposed one would never give a good negative. In the discussion which followed, halation formed the chief topic, it being the general opinion of the members that, although troublesome, backing the plate was certainly advantageous. A vote of thanks was passed to the lecturer, and the meeting separated. Croydon Microscopical and Natural History Club (Photographic Section). A meeting took place on April 17th, with Mr. Edward Lovett in the chair, when an exhibition of hand-cameras took place. The next ordinary meeting will be on May 1st, when Mr. D. E. Goddard will read a paper entitled “ Elementary Silver Printing.” On Saturday, April 25th, a half-day excursion to Oxted for Godstone will take place. Richmond Amateur Photographic Society. On the 17th inst., Mr. Jeffrey in the chair, the subject for discussion was “ Intensifying, Reducing, and Retouching.” Two pieces of home-made apparatus were shown—a frame or box for contact printing, either of paper or transparencies, by Mr. Faulkner, and a shutter by Mr. Richardson, both being of ingenious design and excellent workmanship. The discussion which followed was productive of many practical hints. Leeds Photographic Society. On the 20th inst. a paper on “Bromide Printing and Enlarging” was read by the hon secretary, Mr. S. A. Warburton, the chair being occupied by Mr. J. W. REFFITT. Mr. Warburton pointed out that the chief advantages of the bromide process were that it can be worked independent of day light, the rapidity with which prints can be produced, and the close resemblance that a good bromide print has to a platinotype picture. In describing the manipulation of the process, the various classes of paper in the market were referred to, the “ slow, rough surface ” being the one which seemed to yield the best results. The great secret of obtaining pure whites in the prints was a liberal use of the acid solution after fixing, and for this a one per cent, solution of sulphuric acid was the best. In dealing with the subject of enlarging, the kind of apparatus for use, both with daylight and artificial light, was described, the former as giving the best results, and being less expensive to construct. Photographing Fishes.—M. Marey has succeeded in photo graphing the movements of an animal under water, taking proofs at the rate of fifty in a second, with exposures from 1-2000 to 1-3000 of a second. A set of twelve photographs gives all the phases of the undulations which the medusa impresses upon its umbrella of a locomotor apparatus. A ray has been taken in profile while waving the edges of its flat body, and the curious mode of progression of a comatula has been taken.—Detroit Free Press. Answers to Correspondents. All Communications, except advertisements, intended for publication, should be addressed to the Editor of the Photographic News, 5, Furnival Street, London, E.C. All Advertisements and communications relating to money matters, or to the sale of the paper, should be addressed to the Publishers of the Photographic News, Messrs. Piper & Carter, 5, Furnival Street, London. Questions requiring a reply in this column should be addressed to Mr. John Spiller, F.O.S., 2, St. Mary’s Hoad, Canonbury, N. Mercubius.— Formula /or Sensitising Paper. Unless very heavily salted, a plain sixty-grain solution of silver nitrate is generally employed for sensitising paper, which is left on the bath until it lies flat; drained well by passing over horizontal glass rod, and dried vertically whilst suspended from wooden clips. It may then be advantageously fumed with ’880 ammonia in a close chamber. The practice of using stale albumen is sometimes resorted to, under the impression that it is easier to get with it a uniform coating. L. E. T. (Jersey).— Aluminium Mounts and Fittings. One optician at least now supplies all his lenses in aluminium mounts, and several camera makers employ the metal largely to diminish the weight of tourists’ outfits. We are not sure that aluminium is proof against the attack of sea air, but in inland towns this metal remains untarnished for a consider able time. W. J. S.—The Watch Camera. Messrs. J. Lancaster and Son make two sizes, the smaller taking pictures 1 by 1} inches, but, from the description, it does not appear that there is any simple contrivance for changing the plates. Zero.—Ferrous Oxalate Deposit. The white veil that you sometimes notice in your negatives may arise from the pre cipitation of oxalate of lime. If so, it should disappear in the citric clearing solution, or in very dilute hydrochloric acid. Be careful about the use of the latter, for fear of stripping the film. J. P. Jones.—French Weights and Measures. See last page of the Year-Book. A gramme is equal to 15,434 English grains, and a litre is the measure of 1,000 grammes of water at its maximum density, 4° C., or 39° Fahr. For a one-per cent. solution dissolve, therefore, one gramme in a decilitre, or ten grammes in a litre of water. Tyro.— Recovery of Platinum from Waste Solutions. Mr. Willis stated last week that he acidified strongly with hydro chloric acid, and boiled with some scraps of zinc, when all the precious metal is thrown down in the form of platinum black. A. L. S.—A River Scene. The cattle are satisfactory enough, but the horse in the nearer foreground appears too dark. Could you not screen it off a little during the printing, and so get a better effect ? W. B. (Exeter).—Faded Daguerreotype. Unless you have had some preliminary experience, or if valuable, it might be well to entrust it for restoration to Mr J. Werge, 11a, Berners Street, W., who will probably clean it with cyanide and re-tone it with sei d’or. You may then copy it with the camera, screening off side lights, as Mr. England suggested some years ago, by sinking it in a square shelving frame for that purpose. Middlesex.—The Affiliation Scheme is not dead, as you suppose, but still under the consideration of the council. The details are not yet quite settled, but there is ample authority for your addressing an application to the secretary of the parent society, or passing a letter to Mr. Biden, at 50, Great Russell Street, W.C. R. M. —Brussels Photographic Exhibition. By notice paper, just received, intending exhibitors are requested to com municate, before the first of May, with the Organising Secretary, M. Ch. Puttemans, Ecole Industrielle, Boulevard Du Hainaut, Brussels. The International Congress meeting in that city in August may be expected to bring together a fair assembly of appreciative visitors, and generally to lend interest to the undertaking. Received.— A. M. M. and other correspondents ; also, a copy of ‘ 1 Electricity in Transitu—from Plenum to Vacuum, ” by Prof. W. Crookes, F.R.S.
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