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The photographic news
- Bandzählung
- 13.1869
- Erscheinungsdatum
- 1869
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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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- Heft 545 (S. 73-84), Heft 547 (S. 97-108), Heft 589 (S. 599-610) fehlen in der Vorlage. Paginierfehler: Auf Seite 444 folgt Seite 443
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- Bandzählung
- No. 542, January 22, 1869
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Zeitschrift
The photographic news
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Band 13.1869
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- Register Index To Volume XIII 629
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plunged in hot water the exposed surface was protected by the waterproof coating, and the image developed after the film of gelatine left the glass. The difficulty of the manipulations here naturally limited the application of the process. In another point we think Mr. Blair is under some mis conception. In according to Mr. Swan the credit of using india-rubber for temporary mounting, he adds, that if Mr. Swan “had confined his patent to that particular [the use of-india-rubber], no one could have had any just cause to grumble.” Unless we mistake the matter, the use of no particular adhesive medium for mounting is protected— merely the use of a tissue which, by such mounting, per mits development on the opposite side, and the mode of mounting by which it is effected. Any suitable adhesive medium may be used, but none, so far as we understand the matter, is patented. Mr. Blair speaks of albumen and starch paste as included in the patent. As we understand the matter, no adhesive material whatever is patented ; but whilst suitable adhesive material may be used in carrying out the patented operations, so also may any of the adhesive materials named be employed without infringing the patent, provided the patented tissue and the method of mounting for development be avoided. It is difficult, and perhaps not important, to say when albumen was first used for mounting previous to develop ment. The first record of it is in the Photographic News, the 20th of May, 1864, where Mr. P. Henderson, in a letter dated May 12th, describes it as follows :— Take a piece of albuminized paper (I have used the paper for silver printing, but, of course, the salt would be omitted when prepared for this purpose) ; slightly damp it, so as to make it quite sticky all over; lay the tissue gently down on it, beginning at one side, so as to prevent air-bubbles; lay a piece of clean paper over both, and rub down briskly till the two are quite adherent to each other, just as in mounting a silver print. Then, on a piece of clean glass, pour a few drops of strong alcohol, spread over the glass, and lay the mounted tissue down on it, paper side down; let it lay a few seconds, when the albumen will bo thoroughly coagulated. Pin up till thoroughly dry, when it will be ready for development, and no amount of soak ing will ever separate them. This, as Mr. Blair had not seen, but as he will observe, was published at an earlier date than his own article on albumen for mounting ; but, as Mr. Blair points out, it is defective, in so far as it suggests the coagulation of the albumen after mounting, instead of before, which Mr. Blair has shown to be necessary. The idea of making a transfer tissue and mounting it for development occurred to Mr. Davies, it cannot be doubted, as early as 1862, but, unfor tunately, only in relation to photolithographic operations. In July, 1864, speaking of his former experiments, he says:—“Had I been less intent on photolithography in tints, and had my eyes open to direct printing from the negative, probably you might have had a carbo-gelatine process from me long since.” As the matter stands, however, certain points in the pro duction of carbon prints in half-tone appear to be protected by patent, and the fact that this is so is not altogether loss to the public, inasmuch as the possession of an exclusive right has given incentive to careful and persistent experiment for perfecting the process, which probably would not other wise have been undertaken. No one will be called upon to pay for the use of the improvements in question, we believe, except those who intend to make a profit out of them ; for we have understood—and we hope and believe that we are not mistaken—that the privilege of free use of the patented method which Mr. Swan intended should be per mitted to amateurs will also be accorded by the cessionaires of his patent, the Autotype Company. PHOTO-ENGRAVING AND PHOTO-LITHOGRAPHIC PROCESSES ON THE CONTINENT. Wb were recently favoured by Mr. Waterhouse with a sight of a large number of examples of photo-lithography and photo-engraving, collected in the chief Continental cities which he had visited expressly with a view to ascertain the progress in these branches of the art, and report upon them to that branch of the Government with which he is connected, and by whom he was commissioned to make the report. As Mr. Waterhouse had, in virtue of his letters of introduction, access to excellent sources of information, and opportunities of observation, his report will possess much value. He has promised to furnish our readers with a resume of such infor mation as shall possess the greatest value. As, however, this report is from unavoidable causes delayed, we now give a brief description of the specimens of chief interest which came under our attention. We were scarcely prepared at the outset to learn that in a very large number of establishments the use of bitumen of Judea is preferred to gelatine and a bichromate, both for photo-lithography and photo engraving. Several fine speci mens of photo-lithography in half-tone which we saw were produced, Lieut. Waterhouse informed us, from a stone pre pared with bitumen. A grained stone was coated with a solution of bitumen in turpentine, exposed under a nega tive, washed off with turpentine, and the stone containing the image again slightly grained. By such a process it will readily be seen that a good printing surface with granular half-tone can be obtained. The best photo engravings in line which we saw were done at the Royal Printing Office, Berlin. The method, briefly described, was as follows: A copper plate was coated with a solu tion of bitumen, exposed under a negative, washed off, and etched with hydrochloric acid. From the relief image thus obtained, an intaglio image was produced in electro type, and this formed the printing-plate. The results were exceedingly fine. The most perfect photo-lithographs in half-tone were, however, unquestionably those of M. Tessie du Motay. The process must be regarded as belong ing to lithography, although neither stone nor zinc, but a copper plate, is used, as a support for the gelatine film. The results are exceedingly beautiful; but, unfortunately, as we have before stated, capable of producing a very limited number of impressions. Q forcigu Eliscellaneu. The Photographisches Archiv contains news of the Ham burg Photographic Exhibition, which, owing to the con siderable increase that has recently taken place in the number of exhibitors and visitors, it has been decided to keep open until Christmas, and to illuminate with gas, in order that the building may be thrown open both day and night. No English photographers seem to have forwarded specimens of their skill, a fact which is much to be regretted, as the collection appears to be one of the most complete that has ever been brought together. Photo graphers from almost every town in Germany, from Russia, from America, from India, and from France have sent in pictures, those from the last-named country includ ing many of the best Paris firms. Thirty-two silver and sixty bronze medals, besides many honourable mentions, were awarded, the eight successful candidates for the first group of silver medals being MM. Franz Benque, of Trieste; Bergamasco, of St. Petersburg; Caccia, of Havre ; Luckhardt and Matzner, of Vienna; Reutlinger and Adam- Salomon, of Paris; and Verveer, of the Hague. A meeting of one hundred photographers was held at Hamburg, during the Exhibition, to consider the question of forming a German Photographic Association, to be held every two years in one of the larger towns of Germany. The Association is not to interfere in any way with the different photographic societies, but will confine itself principally to the elaboration of the following subjects:— The establishment of a photographic copyright; the crea tion of a relief fund for widows ; the starting of a journal
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