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The photographic news
- Bandzählung
- 7.1863
- Erscheinungsdatum
- 1863
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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. 228, January 16, 1863
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Zeitschrift
The photographic news
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Band 7.1863
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- Register Index 619
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Band
Band 7.1863
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January 16, 1863.] THE PHOTOGRAPHIC NEWS. 31 quantity added to the bath—not'only the less silver requi site in it, but also the less time required for floating the paper: as the silver salt, from not having so much antagon istic force to contend against in the solvent power of the water, is enabled to produce insolubility by its combination with the dried albumen sooner than it could under more ad verse conditions. Thus, upon philosophical grounds I think it may be in ferred, that the addition of alcohol to the sensitising bath for albumenised paper, will be an advantage. The Abbe Laborde’s conchtsions are, therefore, correct, but not the cause assigned for them.— Vide “Foreign Science,” p. 609, of your Journal for Dec. 19th, 1862. Unfortunately, the belief in one fallacy causes the pro mulgation of others; thus we find the Abbe, who is a man of science, stating, that the dried albumen “ is coagulated both by the nitrate of silver and by the alcohol.” With alcohol in the sensitising bath, we have two ingredients, both of which are assumed to have the power of coagulating the dried albumen; but oven did they possess the power falsely attributed to them, they could not act in conjunc tion, for the weaker power must give way to the stronger; the alcohol, therefore, only serves the purpose of mitigating the solvent power of the water, and has no action whatever itself upon the albumenised surface of the paper. Yours truly, GEOEGE Price. Mornington Road, New Cross Road, Deptford. -——• THE CHLORIDE OF CALCIUM BOX* BY CHAS. WALDACK. Sensitized paper, although kept in perfect darkness, some times turns brown in a few hours. This alteration, which is caused by the action of nitrate of silver on the sizing of the paper, is principally observed in damp weather. Albu men paper is more liable to it than plain salted paper, and such as is sensitized with ammonio-nitrate more so than one floated on a simple solution of nitrate of silver. When kept in a perfectly dry atmosphere, however, even albumen paper floated on ammonio-nitrate of silver will keep for several days. To attain this object, use is made of the properties of chloride of calcium, a salt which absorbs moisture with great avidity, and -which, for this reason, is used as a desiccating agent in chemical opera tions. The apparatus consists of a square or round zinc box with a veiy light-fitting cover. In the bottom of the box is put a sheet-iron pan, filled with dried chloride of calcium. Above it, and testing on a border, is a wire frame on which is laid the sensitized paper. A professional photographer should possess two of these boxes—one in which to keep his sensitized paper, and another in which to keep the prints until the time comes for toning. It is readily seen that the box should be left open as little as possible, to keep out the moisture. Perhaps some im provement might be introduced by which it would not be necessary to take off the cover every time a piece of paper or a print was put in. For instance, the cover might be pierced with a hole, on the top. through which the prints might be slipped into the box, . and this hole might be shut by laying a heavy ground glass over it; or, better yet, with an easily fitting cover. For more security against the entrance of moist air, an india-rubber band might be stretched around the joint of no large cover. After being used some time, the chloride of calcium becomes wet. When this happens, take out the sheet-iron pan containing it, and leave it on the top or in the oven of a stove until the salt is again dry. This ope ration can be performed over and over again without losing its quality. It is to bo hoped that some one of our enterprising manu facturers will take the matter in hand and furnish this useful apparatus to American photographers. * from Humphreys Journal. The credit of this simple, yet useful, invention is due to Messrs. Barresuil & Davanne, two chemists to whom photo graphers are greatly indebted, and who have written the best work on photography in the French language. « PHOTOGRAPHIC PIRACY OF ENGRAVINGS. GAMBART V. BALL. This was an action tried before Mr. Justice Willes at the last sittings at Guildhall, when a verdict was found for the plaintiff —damages, £10. Mr. COLERIDGE, Q.C., on Tuesday last, moved on leave re served to enter a nonsuit, on the grounds that there was no evidence to go to the jury, and that there was no infringement of any Act of Parliament. The question arose on the right to publish photographic copies of certain prints, and whether so doing was an infringement of the Copyright Acts. The plaintiff was the proprietor of the prints, “ The Horse Fair,” engraved from Rosa Bonheur's picture, and of “ The Light of the World,” engraved from Hunt’s picture. The defendant, among other photographic scraps, had sold a copy of the print, “The Horse Fair,” and also a photographic copy of the other print, and the jury found- that they were copies taken from the engravings themselves. The learned counsel contended that these photo graphic copies of the prints in question would be no infringement of the plaintiff’s copyright, unless within the words of the Copyright Acts. The first of these Acts was the 8th George II., cap. 13, which gave any person who invented a design, or engraved or etched it, the sole right and liberty of printing it for 14 years. This was to protect the artist or inventor of the picture. The next statute was the 7th George III., cap. 38, which extended the provision of the former statute by prohibiting any person to engrave, print, or publish, or import for sale, any copy of a print in which any person had a copyright. Mr. Justice Willes.—That is a protection of engraving against engraving, not of engraving against drawing ; a fortiori, not against a new mode of drawing. Mr. COLERIDGE.—That was so. The next statute was the 17th George III., cap. 57, which prohibited “ that any person should engrave, etch, or work, or in any other manner copy, in whole or in part, any print in which there was a copyright.” This statute, the learned counsel contended, did not extend the protection against any other kind of piracy than that which before existed. The next statute was the 6th and 7th William IV., cap. 59, which extended the provisions of these Acts to Ireland. The last statute was the 15th and 16th Victoria, cap. 12, which, by section 14, extended the protection of the Copy right Acts relating to prints against lithographs or any other mechanical process by which prints or impressions of drawings or designs are capable of being imitated. The learned counsel submitted that photographs were not within the meaning or protection of any of these Acts, nor was a word said about photographs in the treaties regarding international copyrights. —Rule nisi granted.—Times. 29roceedings of Societies. South London PHOTOGRAPIIIC SOCIETY. The usual monthly meeting of this society was held in the City of London College, on the evening of Thursday, January 8th, Mr. Sebastian Davis in the chair. The minutes of the previous meeting wore read and con firmed. Mr. A. Harman, the Secretary, exhibited a couple of prints from enlarged negatives ; one an architectural Subject, on albu- menized paper; the other, a portrait, enlarged to a full sheet of paper, from a card picture, printed on resinized paper. Both were good, the latter especially so, being well defined, delicate, soft, and artistic. Mr. Wall, commentingon this picture, said that it proved, in a very satisfactory manner, that resinized paper could render transparency in the shadows. Some who had doubted this had mistaken the depth given by the albumen for depth and transparency in the picture. Mr. Cooper observed, that the specimen on the table was not rolled, and that a greater amount of detail in the shadows would bo apparent after it was rolled.
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