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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
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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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- Bandzählung
- No. 1283, April 6, 1883
- Digitalisat
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Zeitschrift
The photographic news
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Band
Band 27.1883
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- Titelblatt Titelblatt I
- Register Index III
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Band
Band 27.1883
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- Titel
- The photographic news
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market at a moderate price. Quinol is best prepared by passing excess of sulphurous anhydride through the crude mixture con taining quinone; after which the quinol is extracted by means of ether. How SUPERFLUOUS Doos are Killed in Philadelphia.— They are put into an apartment which is made air-tight, and carbonic-acid gas is then allowed to flow in. One hundred can be despatched in this manner at once, and their death is quick and painless. The Grotto del Cane, near Naples, probably suggested the idea; this cavern being ordinarily charged with carbonic acid to a height of about two feet, so that a man may enter with impunity, while a dog is immediately suffocated. Blaikley’s Pocket Slide.—This slide is constructed of thin sheet metal, covered with cloth, and is only about one-fourth of an inch thick, but it is used in conj unction with a special wooden frame which adapts it to the camera. Into this frame the pocket slide is put in much the same manner as a plate is put into the ordinary slide, and any wet or dry back can of course be altered to suit the pocket slide. The Chemical Review says:—“ The Japanese Government pro pose to authorise any citizen of the empire to patent an inven tion, no matter to whom it may belong, or in what countries it is patented, and that any Japanese individual, by taking out such a patent, can utilise the invention of a foreigner to his heart’s content, unless the said foreigner takes the early step of patenting his article in Japan.” A French writer has observed that the initials of the five elements (in their French names) which enter chiefly into the constitution of organic matter, namely, Carbonne, Hydrogene, Azote, Oxygene, and Soufre, spell CHAOS. A Judge’s Opinion on Methylated Spirit.—Methylated spirit was referred to in the Court of Queen’s Bench on Wednesday, and as a witness referred to methylated spirit, the judge (Baron Huddleston) thought proper to enlighten the public as to the nature of this preparation. He said : “ That is a preparation of naphtha in a cheap form, and of much lower strength than spirits of wine.” A witness to whom this view came very opportunely, replied, “ Yes, my lord.” All present felt overpowered by the great weight of chemical knowledge which his lordship displayed, and the case was promptly settled. Photographic Club.—At the next meeting of this Club, April 11th, 1883, the subject for discussion will be on “ The Causes of Frilling in Gelatine Plates.” o - Coxxesgomdenfs. *,* We cannot undertake to return rejected communications. Leonard BERKELY.—1. Untoned silver prints are soaked in a solution of mercuric chloride until the image disappears, after which the prints are rinsed and dried. A piece of thick blotting- paper, wh ch has been moistened with a saturated solution of sodium hyposulphite and dried, is sent out with each print; and when this blotting- paper is placed on the albumenized surface and moistened with water, the hyposulphite acts on the bleached image and causes it to reappear. 2. Add a small proportion of a solution of protosulphate of iron, and the gold will be slowly deposited as a purple precipitate. W. H. (Leytonstone).—Abney’s “Instruction,” which is pub lished at our Office, will give you the required information. G. Frost.—1. Any material of a moderately dark brown colour. 2. It is very suitable for general work. Fair-Bird.—Everything depends on the ownership of the original copyright; but if no copyright existed at the time of A’s death, B would be the owner of the copyright of the enlargement, C being a mere workman or servant of B. The act of D would probably be illegal. W. A. C.—Close black twill; two, or even three, thicknesses. A. W.—We do think it arises from dust. R. B. (Liverpool).—The principal methods are the following. 1. The Pretsch method, in which the granulation of bichromated gelatine is moulded from, and extremely fine results have been obtained; but Pretsch blocks require very careful printing. 2. Ruling or mechanical methods, in which an ordinary relief forms the model. The process you name may be taken as an example.. 3. Etching methods, in which a stippled picture in fatty ink is transferred to a zinc plate, and this is converted into a typographic block by etching with an acid. The fatty picture may be a coarsely-grained-collotype, an “ink photo,” such as we presented to our readers last week, or a transfer obtained by the starch method of Asser. Details of the various processes will be found in the back volumes of the Photographic News. J. W. Collis.—A letter addressed to Captain A. de Khotinsky, St. Petersburg, would doubtless reach the inventor. We believe he was recently, and possibly may be now, staying at the Cannon Street Hotel, London. Andrew L .—1. It consists of silica in a state of almost absolute chemical purity ; and the only acid capable of attacking it is hydrofluoric acid. 2. From a business point of view, such an arrangement is extremely undesirable. C. R. F.—1. It is not an iron compound, in any sense; but com mercial samples generally contain traces of iron as an impurity. 2. Add a little albumen—say, ten grains of white of egg to each ounce. 3. Carried to extremes, as in your case, it is liable to occasion the evil of which you speak; diminish to one-fourth or thereabouts. Studio.—1. It will be very difficult, if not altogether impracti cable, to restore the ground glass to its original condition without removing it from its setting, and again grinding. 2. Thin starch paste. 3. It should only leave a minute trace of ash. Photo. Litho.—1. Ordinary albumenised paper will generally answer quite as well as the special Husnik paper; this latter is double coated, first with gelatine, and finally with albumen. 2. Your nitric acid was probably far too strong, one part to fifty of water being about what is wanted for such work a s you refer to. Belmont.—We cannot tell you of anyone just at the present time, but should think that you might find a suitable person by advertising. W. Bradnee.—Coagulate the albumen film, before sensitizing, by immersion of the paper in methylated alcohol. It has been said that if a lump of camphor be kept in the sensitizing bath, there is no fear of blisters appearing. E. Constance.—Corks are, as a rule, much more suitable than stoppers for out-door work ; still, you must be careful not to interchange them. It is a good plan to tie each to its bottle by a short length of string. A. Manners.—Ordinary flint glass will not answer, as it is ordin arily very variable in density. Optical flint can be obtained from Messrs. Chance and Co., of Birmingham. PHOTOGRAPHS REGISTERED. Mr. F. S. Seed (Hereford)-Photo, of Old Vest Hanging over Chair, &c. Mr. Rvlbb (Burslem)—2 Photos, of Joseph Harkness. Mr. Hannah (Shrewsbury)—2 Photos, of Rev. 0. Garrett. Messrs. Smalley Bros. (Fleetwood)—Photos, of The Library, Rossal; Thornton Church ; The Baths, Rossal; The Mount, Fleetwood. ENLARGED TO UPWARDS OK 300 PAGES. SECOND EDITION OF " STUDIOS OF EUROPE.” Price 2s., by post 2s. 3d. The first English edition was exhausted in three months, and editions appear in America, Germany, and France. On the 15 th inst. will be published— THE PHOTOGRAPHIC STUDIOS OF EUROPE, BY H. BADEN PRITCHARD, F.C.S., Editor of the Year-Book of Photography, late Hon. Secretary of the Photographic Society. The Second Edition will contain much useful additional matter, and will represent the cheapest and most practical hand-book ever issued.
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