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The photographic news
- Bandzählung
- 35.1891
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- 1891
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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. 1692, February 6, 1891
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The photographic news
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116 THE PHOTOGRAPHIC NEWS. LFEBRUARY 6, 1891. photography. The process might be named ‘ heliochromo- graphy.’ Turmeric exactly fulfils the requirements for a fugi tive yellow dye, printing-out completely in a few minutes in bright sunlight. It will be only necessary to find equally fugi tive dyes of the right shades of green-blue and magenta-red in order to obtain direct colour prints far brighter and truer than the best that have been made on the silver chloride plates. Cyanine, which prints out as quickly as turmeric, makes pictures that can be rendered permanent, but it is not exactly the right shade of blue to carry out the process with only three dyes. There are many coal-tar dyes so fugitive that they have no commercial value, and are not manufactured ; among these it is quite likely that suitable dyes for carrying out the process may be found. Should it ever be found possible to continue, by chemical agency, the process started in the dyes by the light rays themselves, the picture could then be made in the camera, and if all the colours could be fixed, like cyanine, when sufficiently reduced, permanent photography in the natural colours would then be within the reach of every amateur. Meanwhile, we shall probably have to content our selves with the more roundabout but no less scientific and capable method of composite heliochromy.” Mr. Browne said he would like to ask Mr. Ives one question. Some time about 1862 or ’63 he remembered seeing a Daguerreotype plate sent from France, and which M. Becquerel claimed to have been made in the camera. It represented a Scotch plaid or shawl; the picture originally had very bright colours, but was then considerably faded. It was sent here as a very great curiosity, and was shown to some of the members of the Franklin Institute. Did Mr. Ives remember what pro cess that was ? Mr. Ives said it was the same old chloride of silver process of which they had an illustration now on the President’s table. It was considerably brighter than the pictures he had shown them, but it was substantially the same process, and was ob tained by two days’ exposure in the sunlight, using a portrait lens. A two days’ exposure in the sunlight was, of course, entirely .impracticable, no matter what the result might be A method of fixing these pictures permanently had not yet been found ; they had to be kept from light. Mr. Earle showed and described a rubber-type outfit for printing titles and numbers on negatives. The novel feature was the fact that the types were positive instead of negative, as usual with type. As a consequence, they printed on the film of the negative in nerjative letters, and when so used a print from the negative showed the letters as positive, so that they could be read properly on the positive print. The types were easily set up, and could be read and corrected in the holder before any printing was done. Received.—From Mr. Scholzig, some samples of gelatino- chloride paper, which we have tried and found to yield rich prints; the paper has a tendency to curl a little. From Messrs. Iliffe and Son, “Photography in a Nutshell, by the ‘ Kernel.’ ” The compiler, in his preface, assumes in the reader an acquaintance with the rudiments of the art, and sets forth as his aim the addition, from personal experience and the produce of others, details of procedure which have been found useful. While acknowledging his indebtedness to articles in current photographic journals, the “ Kernel ” claims that the correctness of the views advanced by others has been tested by home practice. From Bailliere, Tindal, and Co., the February number of “ The International Journal of Microscopy and Natural Science.” Among its articles is one by Dr. Charles Hacks, in L'Illustration, giving an account of an interview with Dr. Koch, in which the inter viewer alludes to the extensive use made of photography by the celebrated doctor whose name is so intimately associated with the “ cure of consumption.” D. W. E. —The matter about which you write is one for the police, and outside the functions of a newspaper unacquainted with either of the parties to the case. S., Vienna.—Your article has been in type more than a fortnight. We are only waiting for space for its publication. Answers to Correspondents. All Oommanications, exsept advertisements, intended for publications should be addressed to the Elitor of the Photoo kaphic News, 5, Furnival Street, London, E.O. All questions requiring a reply in this column should be addressed to Mr. John Spitler, F U.S , 2, St. Mary’s Road, Canonbury, London, ST. All Advertisements and communications relating to money matters, and er the sale of the paper, should be addressed to the Publishers of the Photooraphic News, Messrs. Piper & Carter, 5, Furnival Street, London. H. L. (Highgate.)—Foreground Shutters. There are several forms of shutter which will give diminished exposure to the sky, and consequently, prolonged exposure to the foreground. Probably one of the best is Heath’s patent foreground shutter with Cadett's pneumatic attachment, which is figured in Messrs. Marion and Co.’s catalogue. The “ double flap ” (Guerry's patent) shown in Mr. J. Fallow- field’s catalogue, page 75, might also be suitable for your purpose. R. M.—Nominations. Four out of the six names proposed for vice-presidents have also been nominated as members of council. Make your own selection, but it would not be proper to vote for the same individual in a double capacity. The progress medal is to be awarded to Lieut-Colonel J. Waterhouse, the intention having been officially announced both in the January Journal, and in a circular dated 31st ult. J. H. (Sandwich).—Collodion for Photo-litho Work. 1. The recommendation to distil the methylated ether off quick lime was intended to keep back every trace of free acid, and it would likewise retain any admixture of water. If the alcohol also requires to be treated, you must do it separately ; but in most cases you may rely upon spiritus vini rest, being sufficiently pure without such treatment. 2. Use iodide alone, that of cadmium preferred, without any free iodine, in the proportion of four to five grains per ounce of collodion, dissolving it previously in the alcohol. 3. Olein is the most liquid portion of olive oil, obtained by freezing the oil, and drawing off the uncongealed fraction. W. S. (Bedford Square).—Either MeKellan’s or Watson’s acme camera with rapid rectilinear and wide-angle lenses. The shutter you mention is reliable for work in a hot climate. We gladly note your approval of the Almanac. L. T.—Or. Gunther’s letter. One can only guess that “ water glass” or silicate of potash (or soda), may be the secret method of treating the lithographic stones, referred to on page 80 of last week’s News. C. L. B.—Technical Examination in Photography. The City and Guilds of London Institute holds an annual examination in May. It is not necessary that you should attend lectures at the Finsbury College, but you may get your knowledge anywhere, best by practical experience combined with reading for the theoretical points. Especially read up Professor Meldola’s “ Chemistry of Photography,” and Captain Abney’s “ Instruction in Photography.” Later on, ask the Secretaries for a prospectus of the forthcoming examinations. One in Doubt.—Framed Local Views. Without actual inspec tion we cannot speak with confidence, but many of the glass pictures with narrow brass borders are simply silver prints mounted, with gelatine, in optical contact. They are not transparencies backed with white paper, as you seem to imagine. By uncovering at the back, and peeling off a little bit, yon could, however, easily resolve your doubts. A. W. (Bury St. Edmunds).—Finishing in Black and White. All depends upon aptitude and previous training; but we we should say less than six months ought to qualify you for undertaking this work. When prepared with specimens to show your capabilities and style, it would be easy to make a tour of your district and offer your services. It is quite impossible to answer your question as to average pay ; high art should always be well remunerated, and we hope you will succeed in time. The little book on colouring and finishing is to be had of our publishers for thirteen stamps, B. L.—Albumenised Paper. Ammonia increases the solubility or fluidity of albumen, but its use is not to be recommended, I Other Correspondents in our next,
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