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The photographic news
- Bandzählung
- 7.1863
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- 1863
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 251, June 26, 1863
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The photographic news
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Band 7.1863
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- Register Index 619
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312 THE PHOTOGRAPHIC NEWS. [June 26, 1863. nothing in it which will injure the bath.—I am, Sir, yours truly, A Dry Plate. London, June 23, 1863. [Did you redip the plate in the silver bath before develop ing? or did you add any silver solution to the developer? Unless you made this omission—a thing we have known done —we cannot offer a suggestion as to the cause. Perhaps some of our correspondents may have had some experience in such mishaps. Regarding Werge’s plate-cleaning solution, you are right as to its efficiency, but altogether wrong as to its con stitution. We were entrusted, in confidence, with the formula by which it is prepared, and except that, amongst other things, it contains ether, you are in error. Tannin and honey continue in many hands to give excellent results.—ED.] • Uo Gorrespoudents. W. II. Bishop.—If you took the portrait for your customer without any agreement as to copyright before any of the copies were sold, you have lost the opportunity of acquiring a copyright. If you took the portrait for yourself, you might have obtained a copyright in it by registering it before any copies were sold. But so far as we understand the case now, no copy right in the portrait in question either exists or can be procured by any one. You can get any picture registered in which you have a copyright at a cost of about Is. 4d. An Enquirer.—The general plan of your room is good, but we should prefer the space over head without glass to be lengthened a little, and to have the amount of glass both top and sides a little extended to meet the neces sities of dull weather and bad light. Trywell.—We cannot tell you to what extent the enamel paper has yet come into general use, either in London or elsewhere, and it will always involve more trouble than ordinary albumenized paper. 2. The double sulphate of iron and ammonia may be used as a developer in solutions of various strengths, the same as the ordinary sulphate. See various formula which have recently appeared in our pages. 3. The annoyance to which you refer is a common one, and many respectable portraitists feel it seriously. You can only prevent such copying by taking steps to secure the copyright in such portraits. We shall have something more to say on the subject shortly. A.B.D. — The salt you enclose appears to be a preparation of iron, and appears on a hasty trial to develop in a similar manner to the ordinary sulphate. To ascertain if it possess special advantages would require careful comparative trials. A Constant Subscriber.—It is a moot point whether or not a person may copy a copyright picture merely for his own private use. It is probable that a strict enforcement of the Act would punish copying for any purpose whatever. G. A. B. —The amount of washing you describe ought to be sufficient for a tannin plate ; but some samples of collodion require much more washing than others. Did the spots or mottled marks show on the plate at all be fore development ? If so, probably the collodion is unsuitable. Possibly the development was too hastily done, and without sufficient care as to cleanliness. The plate would have been better with longer exposure. Your cards would have been better for a trifle longer exposure and less development; the definition is wonderfully good for a stereo lens of 3J inches back focus. The stain is due to a certain condition of the bath, sometimes very troublesome in hot weather. See that there is no floating scum at the top of the solution. We have not made sufficient experiment to fix authoritatively the best strength of solution with the double sul phate. We are using it 48 grains to the ounce, with 48 minims of acetic acid, with advantage. The saccharo-sulphate may be had of Messrs. Hopkin and Williams. IANNO-GLYCERINE.—Gallic acid is soluble in cold water to the extent of about 4 or 5 grains to the ounce. There is a slight difference in the solu bility of various samples ; but the use of 5 grains to the ounce will in most cases produce a saturated solution. It is much more soluble in hot water, from 100to 130 grains being soluble in an ounce of boiling water. It may be used hot, and is then for albumen and collodio-albumen plates a very energetic developer. It is better only to heat the quantity required for use. It is very soluble in alcohol, but we cannot state the exact limit. 2. When pyroxyline has become slightly acid from age or exposure, washing it in acetate of soda, or even in alkaline solutions, whilst it may remove the acid, will not restore it to its former condition. The acid can only be liberated by decomposition, and although the acid may be removed, the former condition is not thereby restored. We have not met with the de composition referred to ; but we have found that cotton prepared with moderate care does not easily decompose when kept for many months. We have kept samples prepared by ourselves upwards of twelve months without deterioration. You are right in the estimate of the book in ques- tion. The box has just arrived, but is not unpacked. We do not re member a suitable person for the undertaking, but will give the matter our earliest attention after returning from Paris, whither we go as soon as the present number goes to press. Sol.—Your experience is unusual. When everything is in good order a good purple tone should be obtained in ten minutes, or a quarter of an hour, although, sometimes, it is longer. We prefer slow toning; but you can generally hasten it, when desired, by increasing the strength of the solution. W. G.—Wc have occasionally known similar markings to those which you describe appear on the dry plate before exposure, without affecting the negative. Its cause we are uncertain of. Sometimes it is attributed to the use of an old nitrate bath. IOMERTON.—The best place for stops in a portrait lens is between the front and back combination. As a rule, they should occupy a position governed by the respective foci of the front and back combinations. To illus trate : suppose the focus of the front combination were six inches, and of the back twelve inches, and the distance between the lenses three inches, the position of the stop should be one inch behind the front combination, which would also be two inches in front of the back combination. You can try some stops of blackened card-board placed in the position, and sec if the result is what you desire. R. II. Courtenay.—Wc are sorry we did not see’you. We will give the salt a trial shortly. It appears, on a single trial, to develop very well, but to give a thin image. Tyro.—Your bath is probably super-saturated with iodo-nitrate of silver. Add its bulk of distilled water, neutralize, sun, filter, add silver to make up the strength, and try. 2. Mr. Leake in advising the use of an acetate in the nitrate bath, and at the same time speaking of the use of carbonate of soda, is of course speaking of acetate of silver, and in adding carbonate of soda, he will cither have acetic acid present in the bath, or he will add it coincidently with the carbonate of soda, and so form acetate of silver in the bath. If the collodion to which you refer reticulate, the only remedy is mixing it with another sample. Lanka.—The coppery-looking deposit on the deep shadows whilst developing is a familiar trouble in this country during hot weather. We wrote an article fully treating of the matter last summer, which appeared on p. 361 of our sixth volume. One of the most frequent causes for its appearance is insufficient washing between different stagesof the process, especially when using some spongy samples of collodion. An excellent remedy is to flood the film before intensifying with a solution of iodine one grain, iodide of potassium two grains, in one ounce of water, then thoroughly wash again before applying the intensifier. The best remedy when this deposit has occurred is to treat the finished negative with a very weak solution of bichloride of mercury, which will, without much affecting the general character of the negative, turn the red deposit white, and so make of little account in its effect in printing. 2. Are you sure it is a fungoid growth to which you refer, or is it what is termed a « sweating” of the glass ? Any form of organic matter or fungoid growth ought to disappear on treatment with strong acid, nitric or sulphuric. If you have anything suitable for publication, we do not know of any house with better facilities for distribu tion, or who can give you better information on the subject than Marion and Co., 23, Soho Square. 4. You can become a member of the Amateur Photographic Association. You can receive full details from Mr. Melhuish, the Secretary, 12, York Place, Portman Square. We shall have pleasure in proposing you. The subscription is a guinea a year, for which members receive two guineas’ worth of prints. They must contribute at least six good negatives yearly. Members receive half the profits of sales of their own prints. 5. The addition of carbonate of soda and sunning will, pro bably, suit your baths best. G. Our Year Book contains an annual resume of improvements in the art. Major Russell has a second edition nearly ready. There is announced for publication, shortly, a work by Bland and Co., containing full information of latest improvements ; and Mr. Hughes has a new edition of his manual in the press, which will contain, we believe, very full information on many topics. 7. For certainty the collodio-albumen process : for simplicity and general advantage the tannin process, or some of its modifications. B. B. F.—In attempting open-air portraiture you will find a blackened hollow cone, about the size of a sugar-loaf, attached to the lens, so as to project in front, will materially aid you in getting clean shadows. Your negative is evidently somewhat fogged from diffused light entering the lens. John Alexander.—YourVoigtlanderof 5? inches focus will, probably, answer for instantaneous views, although its aperture is not quite so large in relation to its focus as Dallmeyers new stereo lens, regarding which you inquire. His No. 2 B is most suitable for cards. The information you re quire on the manufacture of formic acid would require the whole of this page to give with efficiency. Amateur.—The mottling to which you refer appears to be due to the especial lighting and extreme sharpness of the texture of the skin. A trifle longer exposure would probably have got rid of it, and would also have given more brilliancy. The chief faults in the picture arc due to unsuitable background and accessories. D.—We will mention your queries to Mr. Blanchard, as, in our experience with the formula, we have not met with the difficulties named. You may remove slight fog or excessive deposit on the shadows, by using with great care, a dilute solution of iodine and cyanide of potassium, one grain or less of each in an ounce of water. Try on a valueless negative first, as great care and quickness in washing, the moment sufficient action has taken place, are necessary. Recent Sub.—The best strength for using the double sulphate solution depends upon many points. Try some of the formulae which have recently appeared in our columns. The salt is now to be had of all dealers, or may be made by the formula we have once or twice given, which consists in dissolving protosulphate of iron and sulphate of ammonia in their equivalent pro portions in water. It may be cither kept so, or re-crystallized. 2. A light grey, either of woollen cloth or in distemper colour, is best for vignetto backgrounds. Several correspondents in our next. Photographs 3egistere During the Past e@Acek. Mr. John Lawrence, 38, Grafton Street, Dublin, Photograph of the “Phoenix Eleven.” Photograph of the « University Eleven.” Mr. James Russell, Littlehampton, Photograph of the Rev. William Knight. Mr. George Teague, 90, Oxford Street, Swansea, Two Photographs of the Rev. John George Gauntlett. Mr. John Hawke, 53}, Union Street, Stonehouse, Devon, Photograph of the Rev. W. II. Parker. Mr. William John Jennings, Market Harborough, Photograph of St. Dionysius Church, Market Harborough. Mr. William S. Shirras, 40, Broad Street, Aberdeen, Photograph of the Aberdeen Volunteer Review. Mr. William Guthrie, 23, Nuns Street, Newcastle-on-Tyne, Photograph of Matilda Dunsmore. Photograph of Emily Cross. Messrs. Hills Saunders, 16, Corn Market Street, Oxford, . Photograph. — Royal Commemoration Group; consisting 1.K.1. the Prince of Wales, 1I.K.H. the Princess or,Walss the Countess de Grey, Lord Mount Edgecomb, Lord I a Earl Granville, General Knollys, Colonel Keppel, theHon Robert Meade, Dr. Liddell, Mrs. Liddell, Miss —hod
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