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The photographic news
- Bandzählung
- 29.1885
- Erscheinungsdatum
- 1885
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- Englisch
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- F 135
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- http://digital.slub-dresden.de/id1780948042-18850000
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- Seite I-II fehlen in der Vorlage. Paginierfehler: Seite 160 als Seite 144 gezählt.
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- Bandzählung
- No. 1380, February 13, 1885
- Digitalisat
- SLUB Dresden
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- Ausgabe
- Parlamentsperiode
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Zeitschrift
The photographic news
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Band
Band 29.1885
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- Register Index III
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Band
Band 29.1885
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- Titel
- The photographic news
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Death of Professor Silliman.— The illustrious American scientist, Benjamin Silliman, died at Yale on the 14th of las month. His labours in connection with pure and applied chemistry will long be remembered. Upon what should the Wet GELATISE Prints be SQvEEZEED ?—Glass isgood, but, despite care and watchfulness in waxing or talcing, the prints often stick. Mr. Warnerke recom mends ebonite. Smooth American cloth has been suggested in our columns; and in the last number of the Bulletin Beige, Captain Abney recommends the use of ferrotype plates. There is no fear of the prints sticking or tearing, while the plates are cheap, and can be obtained at any photographic material store. Messrs. Damson and Co., Opticians and Manufacturer sof Photographic Apparatus.—A correspondent wishes for the address of this firm, and we shall be glad if any reader can give us the information. A Mountain of Alum-Stone.—It is said that a mountain of alum-stone, which has a base over four miles across, has been discovered at Gila, in South America; and that by simply lixi viating the material with water, a solution is obtained which is sufficiently pure for many commercial uses. Local Intensification of Gelatine Plates.—The following method is recommended in the Correspondenz. A varnish which will not dry is made by mixing together ordinary negative varnish, ether, and castor oil (two volumes of negative varnish, one of ether, and one of castor oil, will answer ; but these proportions may be varied), and painting over those parts which do not require intensification. The mercurial method answers best (see Year-Book for 1885, p. 196, also present volume, p. 83), and when the negative has been washed and dried, the varnish is removed by means of alcohol and a tuft of lint; after which the plate may be further treated in the same way if necessary. How to Look at a Picture.—There are two excellent ways of discovering any weakness in a picture you have in hand. One is to look at it through a magnifying glass, which enlarges and makes its shortcomings more noticeable ; the other to reverse it in a mirror. The latter is an old and ever popular method, for the eye becomes so accustomed to looking at a thing in one way that it ceases to be critical. The moment the picture is reversed it becomes a fresh picture, and in nine cases out of ten errors hitherto unnoticed reveal themselves.—The Bicture and Art Trade. Photographic Club.—The subject for discussion at the next meeting of this Club, on February 18th, will be “ Working Capabilities of Cheap Lenses.” Uo Uorespondents. *,* We cannot undertake to return rejected communications Emulsion.—1. It is possible that the change may be due to the partial reduction of the sulphates in the water to the co adition of sulphides; an effect which takes place frequently in the case of water stored in barrels on shipboard. 2. Perhaps the addition of a minute trace of sulphide ef sodium or potassium may answer the purpose, but this is quite conjectural. Dissolve one part of the sulphide in ten of water, and try the effect of adding ten or twenty drops of this to each litre of water. 3. Perhaps this will answer—indeed, it comes to nearly the same thing. Let us know .the result of your experiments. C. Rogers.—Thank you for the calculation, which is interesting and quite correct; but it should have been sent to the publication in which the original article appeared. C. Brown.—If your drop shutter is well constructed, we think you will be able to get the required speed by using a number of rubber bands. Try ; and let us know the result. J. B. H.—Apply to Sprague and (Jo., 22, Martins Lane, or the Meisenbach Co., 39, Farringdon Street. J. Urie.—The address is the one officially given by the Commis sioners of Patents, and if you wish to have another inserted in future announcements, you must communicate with them. It is not an uncommon thing for a patent agent to give his own address as that of his client, and possibly this has been done in your case. A. PENMELL.—Any hints we can give in this column will be of very little use, especially as we know nothing of the locl circum stances. See the advertisement columns. A. H.—We are very sorry that you should also have been ill-treated by the person referred to, and we will make note of your sug gestions. John Churchyard (Southport).—We have no doubt that you write in perfect good faith, but must attribute your claiming to be the originator of the sulphite of soda bath in mercurial intensification to the fact of your not having read the Photo graphic News with sufficient attention. It is not easy to tell you who was the first to use the method, but on page 391 of our number issued on June 20th, 1884, you will find the process described by Mr. W. N. Jay, in much the same form as you say you published it on the 25th of the following July. As regards the exact date of Scolik’s suggestion to add potassium bromide to the mercuric chloride solution, we cannot inform you, it being sufficient for us to mention that your suggestions in this direc tion, which you refer to as published in December last, were an ticipated by the publication of Scolik’s formula on page 657 of our issue of October 17. G. W. S.—Cases have occurred in which similar stains have been the result, when the washing trough has been made of unvar nished zinc; but we cannot devise any theory to explain the action. J. M. Thomas.—1. A rapid symmetrical or rectilinear. 2. A transparent positive. 3. Immerse it in the following :— Water 4 ounces Hydrochloric acid 4 ounce Bichromate of potassium 1 drachm It must remain in this solution until the image is completely whitened. 4. Rub the glasses well with powdered French chalk, dust off the excess, collodionise with plain collodion, and finally coat with the emulsion. Never hesitate to ask as many questions as you may be disposed to. E. J. S.—We do not remember it, but there is a very excellent formula on page 161 of our volume for 1884; also in the Year- Book. S. L.—Sensitized albumenized paper contains nitrate, chloride, albuminate, and often citrate of silver. It is the spontaneous decomposition of the organic salt of silver in the presence of free nitrate which causes the discolouration of the paper. Messrs. Schffner and Mohr, some years ago, introduced into the market a carbonate paper, in which the free nitrate was replaced by carbonate of silver ; although the paper was fairly permanent, it was never largely used. The new gelatino-chloride paper will probably prove stable when preserved in a dry condition. Moisture always conduces to fading and discolouration. Operator.—Varnished collodion films which have become honey combed, and partially separated from the glass by the action of frost, &c., can be restored by the action of alcoholic-ether fumes. A mixture of three parts of methylated spirits and one of ether is placed in an inverted glass shade; two of the negatives are placed in the latter with their film surfaces outwards, the vessel being then covered with a glass plate. After about twelve hours’ treatment the films should have subsided, and all that is needed is to gently warm the negatives to harden the varnish. Notwith standing all this, you had better secure a good transparency first. F. Jackson.—Rub the plates with cotton-wool moistened with the following cream of Tripoli:— Alcohol 30 parts Ammonia'880 ... ... ... 10 ,, Fine tripoli 30 ,, Water 40 ,, When dry, clean oft with a rag, and polish with a well-washed chamois leather pad. C. M.—Thymol added in the proportion of half a grain to the ounce will preserve the emulsion for some weeks. D. Roe.—It costs ten shillings an ounce; there is no doubt that if a demind arose it would be much cheaper. You can obtain it from Kahlbaum, of Berlin, through the agents, Messrs. Burgoyne and Co., 16, Coleman Street, E.C. Uhe Ahotographic Jews. SUBSCRIPTIONS. Including Postage to any part of the United Kingdom:— Yearly ... 15s. Od | Half-Yearly ... 7s. 8d. I Quarterly ... 3s. 10d To the United States, the Continent, ana the Colonies:— Yearly ... 17s. 4d. I Half-Yearly ... 8s. 8d. | Quarterly ... 4s. 4d. To India (Yearly) 19s. 6d. ADVERTISEMENTS IN COLUMN. Not exceeding Five Lines (36 words)... 3s. Od. Each Additional Line 0s. 4d. Repeated insertions, and special positions or style, by contract- Advertisements should be fcrwared (prepaid) to Piper and CARTER 5, Castle Street, Holborn, E.C., to reach the office not later than noon O’ Thursday. A fee of Gd. must be forwarded when the Publisher 0 are xpectcd to receive and forward replies to Advertisements.
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