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The photographic news
- Bandzählung
- 12.1868
- Erscheinungsdatum
- 1868
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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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- Bandzählung
- No. 508, May 29, 1868
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Zeitschrift
The photographic news
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Band
Band 12.1868
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- Titelblatt Titelblatt I
- Kapitel Preface III
- Ausgabe Ausgabe 1
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- Register The Index To Volume XII 619
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Band
Band 12.1868
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May 29, 1868.] THE PHOTOGRAPHIC NEWS. ever you do, keep out nitric acid, or you will certainly have plates that the developer will not lay upon. Thore are other peculiarities belonging to a partially sunned bath that would take too long to describe. To reintensify, take 7 grains iron. 14 grains citric acid, to 1 oz. water; make several Winchester quarts of this, as the longer it is kept the better it gets, and is not in good condition for at least two months. To each Winchester add 3 drachms glacial acid ; weaker iron makes the picture whiter in the taco, stronger, greyer, and develops more. Here again the different kinds of iron give diflbrent results. The iron that remains clear a long time when dissolved gives the strongest picture, that which dissolves the most milky gives the most half-tone suitable for a very hard collodion. There is a pyroxyline that will act the same part in the col lodion that the sunned bath does in dissolving oxide of silver. I expect soon to accomplish this by exposing certain kinds to light in different ways. Iliad prepared everything for these experiments last year, but was so exhausted by continual ex perimental testing of what I had accomplished, that I was afraid to begin a series of experiments, that would require an almost endless proving, between bath, collodion, and developer. To prove with certainty a success, even if obtained, when I accomplish this my original idea, then it will be impossible to fail but by gross carelessness. Until this is done, the process will be imperfect, as I consider doctored collodion and all others only temporary experiments. With a collodion made from such gun cotton and my bath, you will not be able to obtain any iodide of silver but the proper kind. At present this is not so. The rapidity will be something extraordinary, as I know from the few successes I have obtained. To accomplish this has been the object of all my aims, and I have failed; but it has been to mo the hidden treasure, and has given me an ex perience that could not possibly bo obtained otherwise. From these experiments I have learned that bromides are injurious in making a perfect collodion, and that they are not necessarily more sensitive to coloured light than the iodides ; in fact, they’ are highly injurious for perfect working. Understand distinctly that I am only giving the natural action of each chemical; for it must not bo expected that an iron, the character of which is to give soft pictures, will do this when the collodion has not the quality of giving half-tone ; but it will favour it all that is possible. If the collodion is tame, the iron that dissolves and keeps clear, and gives a vigorous pic ture, can only help it; but it will never do the work of the collodion; what is wanted is harmony; and if this is not attained, no chemicals, however perfect, are of any avail in giving constant success. Success depends much more upon the condition or state of chemicals than their perfect purity. I know of no chemicals, however pure, that can bo obtained with any certainty twice alike ; their conditions are different; and unless this is taken into account, there cannot be certainty of results. I have nine diflbrent bottles of silver in the light. Thore are three distinct kinds, three bottles for each ; one of each kind with saturated solution, another with twice the amount of water, the third with three times as much. I mean to put out more silver differently prepared, so as to make sure of the best method of preparing it. This paper will not allow me to say enough of collodion to bo of much value. I have not gone deeply into any part of the process, as I think the information wanted can be best brought out in discussion. The majority of facts here stated wore known to me many years ago ; my difficulty was to harmonize them. Well knowing the odium that must fall upon me should I fail to accomplish all I say, I have put the whole to the test in daily practice for two and a half years, and 1 again assort that I am not only willing, but most anxious, to be put to the proof, as no argument will over decide anything. This I expect will bo done by the London Photographic Society. This is not the time to state how much I have sacrificed to obtain this knowledge, nor the motives that bear mo up against an opposi tion that I felt certain I should have to encounter. 1 trust it will bo admitted that 1 have so far performed all that I promised; and I have not accomplished this much without an expense that should at least place me above suspicion. I ought to know my business; for 1 believe there are few, if any, in Europe who have had the same amount of experimental prac tice ; and for any one to assert that the common process is at all like mine, or could bo made with any amount of skill to give a continued certainty and quality that I state mine will, is a great mistake. 2)rocecdings of Societies, Liverpool Amateur Photographic Association. The ordinary monthly meeting of this Association was held on Tuesday evening, the 26th inst., at the Free Public Library, William Brown Street, the President, Rev. G. J. BANNER, in the chair. The minutes of the previous meeting having been read and confirmed, Mr. Forrest laid on the table a number of pictures taken I lately at Bettws-y-Coed, upon plates prepared by the Liver pool Dry-Plate Company, and stated that out of the whole number he had exposed he had not had a single failure. The development was effected by means of a weak solution of ammonia applied to the plate for a longer time than usual. An animated discussion arose as to the relative advantages of weak and strong ammonia for developing, Mr. Mawdsley advocating a rather strong solution, and other members up holding the weak. Mr. Hughes said he had exposed a plate at Eaton Hall, the image upon which was perfectly visible before develop ment. Mr. Mawdsley said that it was a very frequent occurrence with over-exposed plates. He said ho had noticed it in a marked degree upon a plate he had exposed for an interior when the window was well out, before developing. Mr. Green remarked that since collodio-bromide had come into use very little was heard of comets. Mr. Mawdsley said he had never, with collodio-bromide, met with a single instance of the old tannin spet, round, and transparent, with a black nucleus. Mr. Forrest exhibited a piece of glass which had been ex posed to light for over three years in the window of a church, part of it covered with paint, and pointed out the marked change which had taken p ace in the colour of the exposed part, it having acquired a decided pink tone. After explaining the cause of the change of colour, he touched upon the importance of having photographic lenses, especially those exposed to a concentrated light in enlarging, free from any cause of change . of colour. Mr. Hughes said ho had a pair of portrait lenses by Ross, one of which had been much used for enlarging, but no change had taken place in its colour, as it worked as rapidly as the other, which had never served that purpose. Mr. WIARMBY said the change of colour in photographic lenses was generally attributed to the Canada balsam used in mounting them. The President said ho had great pleasure in announcing that Mr. Green had offered two more of his large photographs to the Society to bo disposed of as follows :—One to be pre sented to Mr. Sayce in recognition of his efforts in perfecting the collodio-bromide process ; the other to be given as a prize for the best collection of twelve stereo pictures, to be exhibited at the July meeting. The cordial thanks of the meeting having been tendered to Mr. Green, Mr. Hughes made some remarks upon “Enlarging.” lie • said ho bad brought all his apparatus with him for the purpose of practically illustrating the enlargement of microscopic objects, but owing to his inability to procure a dark room he was unable to do so. He, however, exhibited his apparatus, and explained the method of applying it, calling particular attention to the fact that the focussing was done upon the sur face of a piece of white cardboard instead of through ground glass. A discussion arose upon the subject of ground glass, &c., for focussing, and Mr. FOREEST promised to show at the next meeting a specimen of a new sort of dull glass, which he thought was just the thing required for fine focussing. A vote of thanks having been passed to Mr. Hughes, the second excursion was discussed, and it was decided to go to Llangollen on the 22nd of June, the President kindly inviting the members to dine with him upon that occasion.
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