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The photographic news
- Bandzählung
- 35.1891
- Erscheinungsdatum
- 1891
- Sprache
- Englisch
- Signatur
- F 135
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- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
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- 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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- Bandzählung
- No. 1714, July 10, 1891
- Digitalisat
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The photographic news
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Band 35.1891
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Ansbers to Corresponents This was warmed, and 2 ounces of negative varnish were added. F. of a remarkably fine black tone. They had been prepared by the following formula::— 2 ounces 10 ,, 2 ounces 10 „ 50 grains 100 „ 10 ounces 15 grains 50 „ 25 ounces Toning Solution. Chloroplatinite of potassium ... Citric acid ... ... ... Water ... ... ... ... Salting Solution. Chloride of ammonium ... ... Gelatine ... ... ... ... Water Experiments with Selenium Cells.—Selenium cells made in the manner suggested (Nature, 23, 58) gradually lose their great resistance and also their sensibility to light. Only one cell out of thirteen retained its original sensitiveness over a space of ten years. A. current from a 26-volt battery, passed through a selenium cell with copper electrodes for two days, deposited amorphous selenium and an oxide of selenium at the anode. The resistance of the cell was then different, according as the current passed from anode to cathode or from cathode to anode. When a piece of magnesium ribbon was burnt near this cell, a current from anode to cathode was indicated by the galvano meter, which ceased when the light was extinguished. The current was proved not to be due to thermo-electric action.— Phil. Mag. Royal Institution of Great Britain.— At the general monthly meeting on Monday, July 6th, Sir James Crichton Browne in the chair, Messrs. Henry Claudius Ash, Henry T. C. Knox, and John George Mair-Rumley were elected members of the Royal Institution. The special thanks of the members were returned to Miss Jane Barnard, Dr. J. H. Glad stone, the Rev. A. R. Abbott, Mr. T. F. Deacon, Mr. A. Blaikley, and others, for the loan of the valuable and interest ing collection of Faraday memorials shown in the library on the occasion of the two lectures on June 17th and 26th, given in commemoration of the Faraday centenary. The special thanks of the members were returned to Sir Frederick Abel, for his valuable present of an CErtling balance, and to Mr. Ludwig Mond for his donation of £100 towards expenses con nected with the Faraday centenary commemoration. destroys adhesion and causes blisters. This you ought to be able to see at the time of preparation, and slight damping of the paper or the addition of a little alcohol to the silver bath will generally remedy this defect. '. I. C.—Coal-Tar Saccharine. Dr. Fahlberg’s preparation and the para-nitro ortho-toluidine are excessively sweet to the taste—many times more so than ordinary cane sugar— and on this account have been recommended for the use of diabetic patients. Sensitising Solution. Nitrate of silver ... Water the predictions for the first days of July, in the London district, were singularly fortunate. If reversed, they would have been nearer the mark. Thus, the 1st, 3rd, and 4th of July were to be “fine and warm,” “ fair as a whole,” or “fair and bright”; but on these days we had heavy showers or torrents of rain; whilst on the 2nd inst., “changeable, fair to showery,” was predicted, when we had not a drop of rain. The direction of the wind proved incorrect on some of the days, but possibly the error lies in attempting to make the same forecast do duty over too wide an area, for no rain fell in Eastbourne on the 1st, whereas London was treated to a deluge, and yet both are included in district 5, England S. (London and Channel). Lab.—The Society of Chemical Industry. The annual meeting has been held during this week in Dublin, and was largely attended, Professor J. Emerson Reynolds, F.R.S., being elected president for the ensuing year. Perplexed.—An Unscientific Paragraph. “ The older method (of making alkali) in use is to force sulphur through common salt, the result being soda. ” We agree with our correspondent in regarding the above extract as a most superficial and erroneous account of the main distinction between the Leblanc and Brunner-Mond methods of proceeding, the only substratum of truth being the fact that no sulphur in any form is employed in the manufacture of soda by the last- named process. Kent.—Deal Pier Charges, According to a report in one of the daily papers, a fee of ten shillings and sixpence is demanded for permitting the camera to be used on Deal Pier. Can this be true ? For, if so, it would be cheaper to take a passage in a passing steamer, or hire a boatman to put off from the shore ; or, better still, select another port, such as Ramsgate or Dover, for marine photographic operations. F. R. M. S.—The Weather Forecasts. It cannot be said that All Communications, except advertisements, intended for publication, should be addressed to the Editor of the Paorograparo 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. J. C. W. (Waldhausen).—Ratios of Exposure. We should put the snow-covered mountains in the first place as requiring least exposure—practically instantaneous ; then the marine subjects or seascapes, which might take double the exposure of the former ; and lastly, the open mountainous views, presumably lower slopes, which would require a longer time, dependent upon the distance of the principal objects from the camera. In ordinary cases give three times the period necessary for the snow scenes. Bear in mind, however, that trap rocks and black cliffs sometimes peep through snow fields, and that figures introduced into such scenes will demand a longer exposure than would otherwise be required. Printer.—Blisters on Albumen Prints. It is important to notice at what stage these blisters make their appearance, for very frequently they only occur when the prints are immersed in the hypo bath, in which case the cure is to avoid too sudden a transition from washing liquors to highly concentrated solutions of greater gravity, by interposing a salt brine to work up gradually from weak to strong. Excessive dryness of the albumen film before sensitising often Fixing Solution. Hyposulphite of soda ... Water After the meeting there was a conversazione. Received.—From Piper and Carter, “ The Handbook of Photographic Terms,” by William Heighway. This is the second edition, revised, and considerably enlarged, of an alpha betical arrangement of the processes, formula:, applications, &c., of photography, and will be found very useful for ready refer ence. From Messrs. E. H. T. Anthony and Co., New York, “The International Annual, 1891-2,” edited by Messrs. W. Jerome Harrison and A. H. Elliott, with Mr. W. I. Scandlin as associate editor. The writers of articles, says the preface, “represent the cream of the brain force which lies behind the many advances in the science of photography ” ; while the illustrations “are well fitted to demonstrate the present advanced state of process work.” We shall in due course give a further notice of this annual, which contains 470 pages.——• From Harry C. Jones, also of New York, No. 2 of “ The Photo-American Review,” which presents this month, as last, thirty-two pages of artistic illustrations, besides interesting and instructive papers on the subject of photography, and a des cription of general literature, with comments. Of this also we shall have more to say. From the Albion Albumenising Company, their “Photographic Price List,” 76 pages, illus trated, with index. We have also received some of the cheap guide books by Percy Lindley, “ Tourist Guide to the Continent,” “Walks in the Ardennes,” &c. These are excel lently written and well illustrated, The publishing office is 125, Fleet Street,
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