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The photographic news
- Bandzählung
- 29.1885
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- 1885
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1405, August 7, 1885
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The photographic news
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Band 29.1885
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- Register Index III
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THE PHOTOGRAPHIC NHWS. Voi. XXIX. No. 1405.—August 1, 1885. CONTENTS. PAGE Buffalo Meeting of the Photographers’ Association of America 497 Scientific Development. By Col. Stuart Wortley 497 Defects Incident to the Construction and Use of Rapid Combi nation Lenses. By J. Traill Taylor 498 The Dignity of Photographic Art. By F. L. Wilson 499 A Portable Support for Washing Gelatine Plates. By W. M. Ashman 499 Report on the Progress of Photography. By C. Gentile 500 Ths Background : Its Use and Abuse. By G. M. Carlisle 500 Photographic Portraits v. Camera Pictures. By J. L. Hurd ... 501 The Handling and Development of Dry Plates. By W. II. Potter 502 page How to Sec. By J. F. Ryder 508 Notes 5f4 Patent Intelligence 506 Cycling as an Aid to Photography. By Henry 506 Meteorology for Photographers. By J. Vincent Elsden, B.Sc. (Lond.), F.C.S 508 Photography and the Spectroscope. By Captain W. de W. Abney, R.E.,F.R.S 508 Correspondence 569 Proceedings of Societies 510 Talk in the Studio 511 Answers to Ccrrespordents 512 BUFFALO MEETING OF THE PHOTOGRAPHERS’ ASSOCIATION OF AMERICA. On the morning Of the 14th inst. this Society was called to order in the State Arsenal, Buffalo, by the President, Mr. Landy, of Cincinnati, there being a large attendance. The meetings lasted four days, and the interest was well sustained. It was a noticeable feature throughout that there was a greater attention to matters of general photo graphic interest than of routine business, as of old. There was a fine display both of photographs and apparatus. The next meeting is to be held in St. Louis, Mo., the date of meeting not yet being definitely fixed. Ten or eleven gold medals are to bo awarded for the best exhibits, and it is expected that the meeting will be an unusually successful one. The new President is Mr. VV. 11. Potter, of Indianapolis. We here append some of the papers that were read at the Buffalo Convention, which was certainly one of an un- usually successful nature. SCIENTIFIC DEVELOPMENT. BY COL. STUART WORTLEY. It will be remembered how great was the variety of developers introduced from time to time in the old wet process, but it is nothing to the proposals that have been made as modifications of dry plate development by the great army of photographic “ faddists." I have before stated in print, and I repeat it again now, that the manufacture of a sensitive dry gelatine plate is a matter of absolute certainty ; but that where talent and progress are shown is in working out a system of development modified at will for every class of negative and for every different kind of subject. I have carefully investigated all developers that have been proposed, in which there were reasonable grounds for hoping that an advance was made, but I am bound to say that I have never found any developer for all-round work equal to that com posed of ammonia and pyrogallio acid. I have found aprejudice existing in certain quarters against this developer, from the fact that many of the formulae give ammonia and bromide of potassium ready mixed together as one of the solutions. Now, this method of proceeding at once takes away the whole value of this method of development; it is absolutely essential that the pyrogallie acid, the ammonia, and the bromine of potassium, should be in three separate solations, and the developer thus capable of being varied at will according to the negative that has to be formed through its influence. My own method of using these solutions is to have a standard solution of the strongest ammonia, 1 ounce to 9 ounces of water, every 10 minims of which will thus contain 1 minim of strong ammonia; the solution of bromide of potassium is 15 grains to the ounce of water; while the pyrogallic solution contains 8 grains of pyrogallic acid to the ounce of water. But now comes one modification on which I lay the greatest stress, and that is the addition of sulphite of soda to the pyrogallic solution. The sulphite of soda solution is thus made :—Take 1 ounce of pure sulphite of soda and dissolve it in 12 ounces of water, then, by the addition of citric acid, remove the alkaline reaction from the soda solution by adding the citric acid little by little till blue litmus paper is turned faintly red; this is a standard solution, and can be kept ready for use at any time. To make the pyrogallic solution, one precaution has to be observed, and it should be made as follows:—Weigh out 240 grains of pyrogallie acid and dissolve it in about 4 ounces of the above sulphite of soda solation, and then add water till you have 30 flaid ounces of solution. Be sure to mix the pyrogallie acid with the sulphite before adding water. Now, here you have a pyrogallie solation which will keep any reasonable time in working order, and your three solations of ammonia bromide and pyrogallie acid are thus always ready for use at a moment’s notice. There is one addition that may with advantage be made, and that is a drop or two of glycocol to the finished developer, made according to the formula which I published some years ago. Its tendency is to give a richer tone to the negative, and to improve its printing qualities. In my own practice with instantaneous pictures, I find it to be of the greatest use to give the plate a preliminary wash with water containing a minim of ammonia to every 2 ounces of water. It certainly increases the sensitiveness of the plate to the sub sequent development, and since the time when I published this proposed modification, I have had ample testimony given me as to its great value. With standard developing solutions, such as I have proposed, any class of picture can, with certainty, be made, and I need hardly tell those who understand dry plate photography that it is impossible to develop all different classes of subject with the same developer, and really to do justice to the development of each plate. I may mention, in conclusion, that a good standard developer for an average negative, composed of the above solutions, would be of the pyrogallie acid solution 14 ounces, of the bromide of potassium solution 30 minims, and of the ammonia solution 25 minims. From this, which I may call a standard developer for an average negative, all modifications should start, bearing in mind that the pyrogallie acid has the greatest influence in increasing density, and that when you have to photograph white dresses, or houses, or other brilliantly-lighted objects, the proportion of pyrogallie acid must be considerably reduced ; and it should be remembered, that if prolonged forcing of an instantaneously ex posed negative should be required, it is wise, after the first one or two additions of ammonia, to put a drop or two of bromide with the subsequent additions, in order to keep the shadows clear ; and if the negative, in coming up, seems to be weaker than it ought to be, some of the pyrogallie acid should also be added. I give these hints, as I have generally found that amateur friends who have consulted me as to difficulties, have continued to add ammonia with the object of forcing a slow development, and have omitted to remember that pyrogallie acid and bromide are also most important factors in scientific development.
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