The photographic news

• Bandzählung: 7.1863
• Erscheinungsdatum: 1863
• Sprache: Englisch
• Signatur: F 135
• Vorlage: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: SLUB Dresden
• Rechtehinweis: Public Domain Mark 1.0
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• PURL: http://digital.slub-dresden.de/id1780948042-18630000
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• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

372 THE PHOTOGRAPHIC NEWS. [July. 31, 1863. best is intended to represent Alexander Selkirk’s first day on the island of Juan Fernandez, illustrating the passage, “ Thus he remained seated on his chest until darkness shut out every object from his sight.” A sailor is seated on a sea-chest on the shingly shore, his head resting on his hand; his gaze is fixed across the sea, scanning the wide expanse with intense and eager look to descry anything which may give him hope. The picture is simple, and natural, and effective. Another picture presents a cottage interior, where a mother knits a coarse stocking and rocks a cradle with her foot at the same time. The third might be termed a new version of the Belle Jar diniere, except that the model, although a healthy rustic wench, is scarcely beautiful. The pictures are about 10 by 8, vignetted, and the photography very excellent. REDUEnG Residues. — A correspondent says: “For the benefit of any who, like myself, have been unable to get suffi cient heat to reduce the ashes from paper, &c., I may suggest that if they have an iron foundry near they may save themselves much unnecessary trouble by taking it there. I had 12 ounces of ashes, which was put in a clean crucible for melting brass, in what they termed the brass stove, from which I got 64 ounces of metallic silver.” Angle oe View.—We have received from “ Tanno Glyce rine,” whose letter appeared in our last, a couple of prints re ferred to in the letter. They are both on 11 by 9 plates, but one is by Dallmeyer's triple No. 1, 8 inches equivalent focus, and the other by a caloscopic lens of 11J inches focus. The amount of angle included by the former is enormously larger than by the latter, and the definition to the edges about the same ; having been taken by waxed paper process, it is difficult to speak with the same certainty on the quality of the defini tion as if the negatives had been on collodion plates. It is somewhat singular that our correspondent, aided by a scientific friend, Mr. William Salkeld, O.E., had been trying, before seeing our note to his letter, the very method of measuring the angle we suggested, namely, the use of a protractor to measure the angle formed by the base line of the picture and the equi valent focus of the lens. They had ascertained the angle by calculation, and by taking a view and measuring the subject with a theodolite, each method confirming the other. We shall shortly have some further remarks on the subject. • Uo Uorresyondents. W. D. B.—Excited albumenized paper may be used to test the non-actinic colour of glass, but unless it withstand the action of light entirely during very prolonged exposure, there is not much certainty obtained as to its suitability for the dark-room,;as the differenceibetween the sensibility of excited paper and a sensitive collodion film is almost incalculable. We generally use the spectroscope, which is a certain method of testing ; but you may obtain certainty for yourself, if you desire, by placing the glass in contact with an excited collodion film and exposing it for a minute to the light, and then developing. If the film show no deposit whatever where it was protected by the glass, you may glaze your room with the sample used without fear. Thomas Jones.—All the residues from your sink, cyanide, hypo, &c., may be treated with sulphide of potassium, and the silver recovered as a sulphide. An Old Photographer.—We believe that Mr. .Solomon sells an apparatus for taking microscopic photographs. M, A.—So far as we can speak with certainty, a good rule with ordinary tannin plates is to give them 6 or 8 times as long exposure as would be given to wet plates under the same circumstances. We do not know much of the constitution of Mawson’s collodion, but we believe it to be slightly bromized. For the tannin process you would probably be safe in adding to it bromide of cadmium at the rate of a grain to the ounce. 2. The appearance of the image on a tannin plate after exposure and before development is often the result of over-exposure, but it is not necessarily the case ; some qualities of collodion have a tendency to give it. Waxy sympathises,deeply withour correspondent " Cha-meal-ion's " troubles in connection with the lime toning bath. He says that his own “ warm flesh tints” are disappearing, and that he is becoming pale and haggard ; that he has absolutely discovered three grey hairs in his " rich black ” locks ; that he is, in short, becoming mealy himself, in trying to use the lime bath successfully. He wishes to know where Mr. Parkinson’s paper, gold, and lime were obtained. So far as we know, the first was obtained from a provincial French town, the second from Paris, and the third from the nearest oil-shop to his atelier in Dieppe. See communications from Mr. Hughesand “Engineer,” in the present number. We have within the last few days ourselves tried Parkinson’s toning bath with perfect success. We shall probably have something to say on the subject in our next. The chloride of lime is such as we procure from the oil-shop. There is no need of any special preparation. 8. 3. Starbuck sends us a very good card picture as a specimen of his work as a negative operator of four months’ experience. It is highly creditable to his skill and industry. The only improvement it needs is a trifle longer exposure of the negative. J. E. Whitehead.—The enamelled paper referred to was simply an experi mental sample prepared for Mr. Cooper, after the method described in our pages a few weeks before the allusion to which you refer. It has not been prepared for sale as yet. We have not heard whether Mr. Cooper has made any progress with his experiments in that direction. Our corres pondents must excuse us writing private letters on subjects which can be answered here. Our time would be more than fully occupied with letter writing if we did so, and it is already considerably over-taxed. Photo.—Nothing could be worse than the system you are advised to adopt. If you give the prints only two changes of water after coming from the hypo, and then leave them soaking all night, you leave them for hours in what is practically a weak hypo bath, than which nothing can be more destructive to the brilliancy and purity of the print, and possibly to its permanency. Washing for a couple of hours in six or eight changes of water, rapidly given at first, would be much more efficacious than such a system. Huson and Poole.—A saturated solution is easily made by taking care to have excess. The exact amount of either chloride of lime or carbonate soluble in water varies under different circumstances. The latter is scarcely soluble in pure water- at all, but it is soluble when any carbonic acid is present, which in most waters it is in greater or less degree. We regret our inability to answer in private letters questions of this kind. Letters containing such questions are rarely even read until the appointed time for answering all in this column at one time. Churk.—Your best plan is to begin by neutralizing your bath with carbonate of soda, then sun for a few hours. Boiled rain water will, probably, con tain some traces of organic matter, and sunning will precipitate it. Bear in mind, however, that the streaks to which you refer often arise with cer tain samples of collodion, and are entirely absent with another collodion in the same bath. 2. Nitric acid added to carbonate of soda will give nitrate of soda. Peter Griffiths.—The yellow stains are caused by some trace of hypo coming into contact with the prints before they are fixed, either from fingers or dishes. If the prints are washed in the same dishes, before fixing, which are used for washing them after fixing, traces of hypo suffi cient to cause such stains will often hang about the dishes. B. W. S.—The superficial fog you describe, which will brush off, and to which, if everything is not in perfectly good condition, there is often a tendency in hot weather, may often be prevented by decreasing the strength of the developer and using more acid in it. If this be insufficient the bath is at fault, and you had better neutralize and sun it. 2. The white stain you describe, probably arises from the drainings of the plate coming in contact with some foreign matter at the corners on which the plate rests. C.E.—Rain water which has become brown from contact with organic matter may be rendered quite pure and suitable for washing dry plates by the addition of Condy’s fluid. Chlorides will not be removed, however, from hard water by the same application. Distillation is the proper method of removing chlorides. M.P.—Your negatives generally have been insufficiently exposed, and want a little more care to secure sharpness. No. 1 is much under exposed, and altogether too thin to give good results. No. 2 is not sharp and is under-exposed. The varnish chilling is caused by using a spirit varnish without heat. The portions of the paper which you have marked with a cross have not come into contact with the silver solution, and the albumen has consequently been washed off in the subsequent operations. The brown stain in the middle of the print is from a defect in the paper caused by an irregular flow of the albumen. No. 3 is much under exposed and a little fogged. No 4 is the best; the streaks are apparently caused by an imperfect and uneven layer of collodion, possibly from the fault of the collodion, possibly from bad manipulation. Be more careful to get a perfect, even film without ridges or lines, and do not immerse the plate so quickly after coating. 2. You will find an article on collodion in our Almanac. 3. Always use glacial acetic acid, which is a definite article; its strength is indicated by its crystallizing at a temperature of 50° Fah. Beaufoy’s acetic acid is an article of uncertain strength, generally con taining about one third of real acid. The term “ acetic acid No. 8” is a phrase used in America, and relates to the classification used there. 4. Some toning solutions may be used over and over—the acetate bath for instance. 5. A strong, hot solution of soda will cleanse a greasy bottle; rinse it well afterwards, before putting chemicals into it. 6. You may intensify after the plate is dry. Read the article on intensifying in our Almanac. 7. Plain collodion is uniodized. Pyroxyline is cotton which has been submitted to the action of acids, and rendered soluble for making collodion. L. S. B.—In order to copy a picture the same size as the original, it must be placed at a distance from the lens equal to double the equivalent focus, and the camera must be extended to the same length. For instance, with your No. 1 B, which has an equivalent focus of between 5 and 6 inches, fix up the picture to be copied, and place the camera so that the lens is about 11 inches from the picture, and draw out the camera so that the ground glass is 10 or 11 inches from the lens. This done, a very little adjustment will give you a sharp image the size of the original. Use a small stop, and give sufficient exposure. G. B. D.—The Photographic Exhibition in Paris is in a part of the Palais de 1’Industrie, in the Champs Elysee. Several correspondents in our next. Photographs G&egisterel during the Past dAcckt. Mr. Stewart C. Smith, Witchburn Cottage, Campbeltown, 1 Photograph.—Inauguration of the Albert Memorial on the -* July at Rothesay. Mr. John D. Mercier, 38, Bold Street, Liverpool, , Photograph of General Sir J. L. Burgoyne, Bart., and his Ald de-Camp, Captain the Hon. George Wrothesley. Mr. Thomas Wilkinson, 121, Snargate Street, Dover, Four Photographs of the Rev. Mr. Yate. Messrs. W. and D. Downey, 9, Eldon Square, Newcastle-on-Tyne, Photographs of Professor Owen, Rt. Hon. Sir G. Grey, v’ W. Gladstone, Daniel Maclise, Thomas Milner Gibson, — M. Ward, R.A., Sir Augustus Clifford. Mr. A. S. Watson, 2, Regent Road, Great Yarmouth, Photograph of Mr. Winter. Photograph of C. Steele, Esq. Photograph of H. Overman, Esq.