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The photographic news
- Bandzählung
- 27.1883
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- 1883
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- No. 1315, November 16, 1883
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The photographic news
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- Titelblatt Titelblatt I
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730 HE PHOTOGRAPHIC NEWS. LNOvEMBER 16, 1883. six marks ; while the. “ International Victoria ” mulcts its members of but five marks, a fact that accounts, perhaps, for its comparative prosperity. atent Entelligence. Application for Letters Patent. 5324. Joseph Julius Sachs, of Union Court, Old Broad Street, in the city of London, for an invention of “Improvements in, or connected with, the production of surfaces for printing, embossing, or ornamental puposes."—Dated 10th November, 1883. Patent Sealed. 2677. ALEXASLER Melville CLARK, of the firm of A. M. and W. Clark, of 53, Chancery Lane, in the county of M iddlesex. Fellow of the Institute of Patent Agents, for an invention of “Improvements in, and in apparatus for, changing and storing photographers’ backgrounds and other movable scenery.”'—A communication to him from abroad by William Evans Lindop, of St. Thomas, in the province of Ontario and dominion of Canada.—Dated 30th May, 1883. Grant of Provisional Protection. 4471. RICHARD BRoWN and Robert William Barnes and Joseph Bell, all of Liverpool, in the county of Lancaster, for an invention of “ Improvements in means for and method of producing designs upon paper or other fibrous or soft material.”—Dated 19th September, 1883. Patent Granted in Belgium. 62,680. R. Brown, R. W. BARNES, and J. Bell, Liverpool, for “ Preparing photographs and other pictures for photographic reproduction.”—Dated 22nd September, 1883.—English Patent, loth March, 1883. ISOCHROMATIC PLATES. BY GREENWOOD PIM.* I PRESUME we are all aware that one of the greatest drawbacks to photography as a means of producing representations of objects in nature or art lies in the fact that, so far, certain colours affect sensitive plates very differently from our optic nerves ; in other words, a colour which appears light to the eye, such as yellow, comes out in a photograph darker than a (visual) much darker blue. The reason is equally well known—namely, that the actinic power of yellow, which has great illuminating effect, is but feeble, while blue, which is weak in illumination, is strong in actinism. Indeed, there are some rays of the spectrum which affect sensi tive surfaces strongly, while, having no illuminating power, they are quite invisible to the eye. In the month of June last, Mr. J. R. Sawyer read an elabo rate paper before the Photographic Society of Great Britain, detailing a series of experiments he had made with various sensi tive surfaces to reproduce different colours according to their natural values—in fact, to convey by different shades of a mono chrome the effect of a number of colours. He used iodized and bromized collodions, and gelatine plates, both plain and stained with eosine. Mr. Sawyer had heard about, but not seen, the plates I am about to bring under your notice this evening, and his results went to show that gelatine plates reproduced the various tints much better than collodion, but the eosine staining did not seem to have had much effect. A few weeks ago a lady—unknown to me—a sitter of Mr. John Clayton, the patentee inventor and Co. with M. Attout- Tailfer, of Paris, of the “ Isochromatic ” plates, very kindly sent me two prints showing the effect of colours photographed on ordinary and on the new patent plates, which were very striking indeed. A wood-cut of one of them appeared in La Nattire and in the PHOTOGRAPHIC News a few months ago. In the other, a band of yellow, blue, and light yellow is rendered with the blue the darkest, orange intermediate, and the yellow almost white ; while on the ordinary plate they are just the reverse. At this lady’s suggestion, I wrote to her brother, who was good enough to send me a dozen plates to experiment upon. So far, I regret to say, my results have not been at all as good as those sent me, but it is quite possible that by more care in adjusting the exposure I may succeed better. I pass round a few rough prints, for which I must apologise, as * Read before the Photographic Society of Ireland. for various reasons, especially an accident to the toning bath’ they are very imperfect, but they will serve for illustration. Before describing my experiments in detail, I wish to state that so far these “ isochromatic ” plates, though not entirely, or even nearly, isochromatic, are, nevertheless, very much more so than ordinary gelatino-bromide plates, and I wish at present to avoid pronouncing anything like a decisive opinion on such very insufficient evidence. Experiment 1.—Two skeins of wool ; one shading from very dark blue to white, and the other from very dark orange through yellow to white. As the French plate was somewhat slower than the ordinary one used (Wunderscbonen) I gave it a little longer exposure to equalize matters. Result:—Relative tints much better brought out by “ iso ” plate than ordinary, but blues much lighter than yellows. Experiment 2.—A spray of canary creeper (bright yellow) and blue lobelia ; both failled through under-exposure. Experiment 3.—Two pale yellow single dahlias against a bright blue-covered book. Also under-exposed; but “iso ” plate gave considerable detail in flowers, and the ground somewhat lighter ; while ordinary plate was almost destitute of detail, giving merely a black patch for the flower on a white ground. Experiment 4.—A coloured plate of pale blue and pale yellow water-lilies. Result :—Ordinary plate, blue ; plate, very white ; yellow, very dark. “ Iso ” plate : blue darker, and yellow lighter, but yet not like originals, as the yellow was much the lighter colour. Experiment 5.—A series of green, light yellow, bright blue, deep red, and orange ribbons on a cream ground. Result:— “ Iso ” plate : Yellow, a little lighter than blue ; green, a little lighter than either ; orange, dark ; and red quite black. Ordi nary plate : Yellow, decidedly darker than blue or green ; orange and red, both quite black. In these experiments I photographed the card sent me with orange, blue, and yellow alluded to above. My result approximated to, but did not nearly equal, Mr. Clay ton’s. Experiment 6.—A coloured plate of a flower having deep blue petals and bright yellow stamens. Result: —“ Iso ” plate : Flower, light; stamens, plenty of detail, slightly darker. Ordi nary plate : Flower about same tint as the other, but stamens quite black and no detail. Exposure to “ iso ” and ordinary were alike in these two experiments. Experiment 7.—Same as No. 5, but developed with ferrousoxa- late, but no ordinary plate used for comparison. Result:—Very much the same, but image more vigorous than in No. 5, in which, as in all the others, except Nos. 7 and 8, pyro was used about four grains to the ounce. Experiment 8.—A light purple flower with yellow stamens. No ordinary plate. Result: - Purple and yellow rendered about the same tone ; yellow rather darker. In experiment No. 3, I had also a light buff flower, which on the ordinary plate came out very white, and much less so on the isochromatic plate. Messrs. Attout-Tailfer and John Clayton, 18, Rue des Cor- delires, Paris, the firm who are making these plates, sent me at my request their prospectus with prices, which are very much the average of ordinary English makers’ plates, and they seem to be good, clean, well-coated plates (one I tried failed to intensify with mercury; I do not know whether that applies to all) ; and if, in addition, a little practice will enable us to reproduce colours more in accordance with nature, they will be a very decided step in advance, and will, no doubt, soon come into general use. However, it is for figures and for copying paintings rather than for landscapes that I imagine their chief utility will consist. How they differ from ordinary plates I of course do not know ; but that eosine has something to do with it is, to say the least, highly probable. I have not myself as yet tried the effect of staining an ordinary plate with eosine, but as others have failed to get much result in this way, we may suppose that it is in some other way—perhaps in the emulsion that it is applied. Corxespondemce. CUSTOM HOUSE OFFICERS AND DRY PLATES. Dear Sih,—I have just read the letter of Mr. W. J-A. Grant in your impression of last week, wherein he relates his unfortunate experiences in getting his sensitive Prate-
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