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The photographic news
- Bandzählung
- 35.1891
- Erscheinungsdatum
- 1891
- Sprache
- Englisch
- Signatur
- F 135
- Vorlage
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- SLUB Dresden
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- Public Domain Mark 1.0
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- urn:nbn:de:bsz:14-db-id1780948042-189100009
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- http://digital.slub-dresden.de/id1780948042-18910000
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- oai:de:slub-dresden:db:id-1780948042-18910000
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- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1691, January 30, 1891
- Digitalisat
- SLUB Dresden
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Zeitschrift
The photographic news
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Band
Band 35.1891
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Band
Band 35.1891
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- The photographic news
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lecturer had brought with him several sheets of exposed films in various stages. He proceeded to describe the process : A sheet of vegetable parchment, having a film of gelatine on its surface, is immersed for three minutes in a bath of bichromate of potash neutralised with ammonia. The sheet is then squeegeed to a glass plate that has previously been cleaned and polished with French chalk. The plate is now left to dry spontaneously. The drying should be completed in about ten hours, when the film will peel off its support. The maximum of sensitiveness would be reached in from two to three days after sensitising. The object of drying the sheets on glass is to produce a flat surface, thus giving perfectly even contact with the negative. The sensitised film is exposed in an ordinary printing frame. When suffi ciently exposed, the image will be quite visible. An exposure of the back of the film for two or three minutes to diffused light will cement it to the parchment support. The exposed tissue is now placed in water, and allowed to remain about two hours until quite colourless ; it is then drained and blotted, and the following solution poured over it:— Glycerine 70 parts Ammonia ... ... 3 „ Water 30 „ After soaking for an hour, the tissue is stretched upon a frame over a block of wood, and rolled up with printer’s ink. For this purpose, the lecturer recommended using first a stiff ink, and afterwards a thinner kind. Authorities differed with regard to the materials for thinning the ink. The lecturer said he preferred lard for this purpose. Sufficient rolling having been given to the surface of swelled gelatine, a sheet of paper is placed on it, and an impression can be taken in an ordinary letter copying press. Mr. L. Warnerke, at the conclusion of the demonstration, pulled several proofs from a sheet of prepared tissue, and passed them round. In answer to several questions, Mr. Warnerke said he was unable to state the limit of the num ber of impressions that could be taken from one sheet ; he had taken as many as 300 himself. Any paper might be used. It was necessary in printing to lay strips of paper round the inked image to protect the sides of the sheet of paper receiving the impression. Mr. T. Bolas, after referring to the very lucid manner in which the lecturer had described the process, said he doubted whether the use of v. getable parchment as a support for the sensitised film had any advantage over a glass plate. The latter process involved less labour, and he preferred the results produced by it. Mr. W. England spoke in praise of the work of Mr. Ernest Edwards, a rigid support being used. Mr. Bolas said that one of the faults of loose films was the production of a balo round any dark object in the picture. Mr. W. E. DEBENHAS said that this would only be found in the first impression taken. Mr. Warnerke said that some of the finest collotypes he had ever seen had been produced by Balagny’s machines, exhibited in the recent French Exhibition at Paris. Process Work.—In everything constructed by the Hand of man, from a thirteen-story building to a coal scuttle, or from a wash-tub to an ocean steamer, is found design presupposing designing, and nearly always decoration involving a question of taste. The order of creation in the human world is, first conception, next delineation, and last construction. Under the pressure of this enormous demand for illustration have developed those many processes of reproduction made possible by photography, by which the rapidity of constructive work is so very greatly facilitated, and the transient scenes of daily life in all quarters of the globe are laid before our eyes almost as soon as they occur. The limit of all process work, however, is existence. The non-existent can only find expression through the intelligence of man, and his hand must ever remain the instrument by which are called into being the creations of his mind,—The Cosmopolitan. Answers to Correspondents. All Cmmunications, except advertisements, intended for publication should be addressed to the Editor of the PHOTOGRAPHIC News, 5, Furnival, Street, London, E.C. All questions requiring a reply in this column should be addressed to Mr- John Spiller, F.C.S., 2, St. Mary’s Road, Canonbury, London, N. All Advertisements and communications relating to money matters, and for the sale of the paper, should be addressed to the Publishers of the Photographic News, Messrs. Piper & Carter, 5, Furnival Street, London. W. D. B.—Donkin's Portrait. Mr. Spooner, of the Strand, had an excellent portrait of the late W. F. Donkin, taken, if our recollection serves, by Mr. Barraud. Failing this, apply to Mr. F. A. Bridge, of Dalston. Pharm.—List of Members, Photo. Soe. In our reply to you a fortnight ago, we inadvertently stated that the last printed list of members, Photographic Society, appeared in February, 1889. This was an error, as we now learn from the secre tary ; there was another list issued in February last. A. S. H. (Bury St. Edmunds).—Recovery of Silver from Mixed Hypo and Chrome Alum. The quantity of chrome alum you have been using is unnecessarily large ; one-fourth that quantity would have sufficed. Moreover, it introduces a difficulty in the recovery of silver, for when sulphide of sodium (hepar-sulphuris or “liver of sulphur ”) is added to such a mixture, there is a tendency to throw down oxide of chromium along with the desired sulphide of silver. To remove this contamination, you should filter it off and digest the black precipitate first obtained with dilute sulphuric acid, in which the chromic oxide alone is soluble. Now filter again, wash the black sulphide until free from acid, dry it, and fuse with an excess of nitrate and carbonate of soda to get pure silver. E. P.—Some Applications of Photography. The lecture which Lord Rayleigh intended to deliver at the Royal Institution last week has been postponed until Friday, February 6th, in consequence of domestic bereavement. H. J. B.— Messrs. Hurter and Driffield’s Paper. Discussions have taken place at the Parent Society, Camera Club, and at the Liverpool section of the Society of Chemical Industry, where, in May last, the original paper was read. The latest communications will appear in the forthcoming official journal of the last-named society. They reach to great length, and it may not be possible to reproduce them in extenso ; that, however, is a matter for the decision of the editor. A. M. M.—At this period of the year, when back numbershave been sent to the binders, one has to trust to the memory. Thank you for reminding us. E. W. B —The question you ask is one of the most difficult upon which to give advice. We will write to you in the course of a few days. J. P. and Co.—The particulars asked for shall be sent to you. W. E. M.—Mr. J. R. Gotz, of 19, Buckingham Street, Adelphi, keeps it in stock. Lab.— Vegetable Rods for Isochromatie Work. We should be afraid to trust them ; for although, as you say, red cab bage, beet-root, and red currant seem tolerably permanent in stock bottles, there is always a tendency to change colour when exposed to the atmosphere. A trace of ammonia escaping fron the developers in the dark room might be enough to change over the red to blue in plates prepared and stored in your dark cupboard. Try the experiment, and report the result. Much will depend upon whether you required the tinted plates for immediate use, and a little acetic acid might help to make the colour more permanent. A. W.—Bromide Printing and Finishing. Mr. A. H. Bool’s little treatise on “Photographic Painting” has a chapter devoted to working up bromide enlargements in black and white. With these few hints, and home practice, you ought to succeed ; and then you could offer your services by adver tisement. Being far away from any recognised centre increases the difficulty of your getting practical lessons. Darnley.—The burnisher can be got of Messrs. Marion and Co., or of the Eastman Company. H. L. (Highgate), R. M., and other correspondents in our next.
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