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The photographic news
- Bandzählung
- 27.1883
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- 1883
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1302, August 17, 1883
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The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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528 THE PHOTOGRAPHIC NEWS. [Augitsi 17, 1883. with the exception of a black stripe on the neck. The upper surface is non-luminous. Decidedly American.—A remarkable invention is described by an electric contemporary. It is a device for photographing in a telephone exchange all persons using the telephones on wires emanating therefrom. The photograph appears on a ribbon which runs under the eye of the operator. If the person using the instrument is not a subscriber, the fact is at once apparent, and the person in whose office the telephone is located, is charged a fixed sum for allowing his instrument to be used by one not entitled to use it. Each ribbon will hold 250 photographs, and when full, will be filed away. It is claimed that the telephone service can be much improved if the use of the instrument is restricted to subscribers only, as is likely to be the case if the photographic device is attached. But it must be remembered that in some business houses it is necessary that twenty of more different persons shall use the telephone, and the photographic feature is likely to become complicated. — The Eye. Action of Light on an Aqueous Solution of Cane Sugar. -—Messrs. Gladstone and Tribe find that exposure to light is un favourable to the development of fungoid growths in a solution of caue sugar exposed to atmospheric air ; but experiments which they have recently made do not confirm the observation of Rouet that the cane sugar becomes changed into glucose when its solu tion is exposed to light. Lockyer's Dissociation Theory. By W. Vogel (^nn. Phye. Chem. [2], 19, 284—287).—The author has on a former occasion taken exception to Lockyer’s dissociation theory, and has pointed out that photographs bring out a fifth hydrogen line very close to the Fraunhofer calcium line H'. This line was probably confounded by Huggins with its neighbouring calcium line, and its presence, taken in connection with the absence of the calcium line H" in the photographs of the spectra of the so- called white stars, was one of the principal arguments brought forward by Lockyer. Attention is also drawn to the researches of Liveing and Dewar, which have conclusively proved that certain magnesium and calcium lines are brought out only in the presence of some foreign substance—hydrogen, for example.— Journal of the Chemical Society. Transferring Paintings from one Canvas to another.— To transfer a painting from one canvas to another is not difficult, said the renovator. I first paste several thicknesses of tissue paper on the face of the painting, after taking it from the frame. When it is dry’ the canvas is wet thoroughly, and I peel it from the back of the picture, leaving the painting fast to the tissue paper. After it dries again, I glue a new canvas to the back of the picture, and when it has dried for the fourth time, 1 wet the tissue paper, and peel it off. The picture is then ready for the usual cleansing and renovating processes. Are there many im portant paintings on wood in existence ? Very many, or there were before they were transferred to canvas. When the wood is so old that the paint begins to flake off, from old age, then the only chance to save it from ruin is to transfer it to canvas. I paste the tissue paper on the face of the painting, and then turn it over, and plane off the wood with a plane whose iron has a convex edge. When the wood is worked down thin, I use a chisel with a rounded edge, and when the white paint, which is usually the ground work of a picture, begins to appear, I take off the last of the wood with pumice stone and a damp sponge. The Bed of the Sea as Seen from a Balloon.—Mr. Sim monds, in speaking of his recent trip across the German Ocean, expressed the opinion that instantaneous photography could be used from balloons with great success in the work of surveying the bed of the sea, which was plainly discernible during the greater part of the voyage. Photographic Club.—In consequence of the recent legal decision on the subject of Copyright, members and visitors are requested to observe that it has been considered advisable to alter the title of the subject for d scussion on Wednesday evening next, the 22nd inst., to that of “ Photography as a Fine Art.” Goxxesgonbents. *,* We cannot undertake to return rejected communications. F. Gregory.—The lamp is not the right distance from the con denser. Find the correct position by trial. F. W. B.—1. A trace will do no harm. 2. It is hardly possible to pick out one item in each process, and to consider them as you propose. Admirab'e results maybe obtained in either case. If you were to use the larger proportion with the last-mentioned formula, we imagine the results would be unsatisfactory. H. Anderson.—There is not any special treatise on the subject, but you cannot do better than read up the matter in the Year books and the “ Studios of Europe.” A. G. B.—I. We cannot tell you why, but our experience is the same as your own. 2. As we do not use it, we can hardly speak from personal knowledge. It is but a makeshift, after all. H. I. Davison.—Thanks for the print, which we shall examine in detail. E. D.—We congratulate you on your success. It is vigorous and well modelled, without being harsh. You ask us to find the principal fault of the picture; we have failed. Ed. Little.—Thanks. W. Dailley.—About double the exposure would be required, the aperture being the same. You should not, however, work with a larger stop than one-twelfth of the focus. Distance.—There must have been a reflection from some part of the inside of the camera. Take out ths focussing screen, and examine carefully. Traveller.—1. You will find work very trying under such con ditions, as the atmosphere is moist and hot; still, such precau tions as you propose to take should render work practicable. 2. We recommend the latter. B. N.—We cannot, of course, put ourselves altogether in your place, but we are inclined to think that 81 by 64 will, under the circum stance. be best. J. N. Holmes.—Boil them in oil of turpentine fora few minutes; but you must take careful precaution against any accident from fire. B. Thompson.—It should dissolve readily in nitric acid of the strength you refer to ; but from what you say, we imagine that you have been using hydrochloric acid. F. B. Lane.—Although excellent as a piece of optical work, the instrument has no market value at the present time. You maybe able to find a purchaser, but we imagine that a dealer would either refuse to buy it, or would offer a very trifling sum. E. L. Forster.—1. It is perhaps the most actinic light known, after direct solar rays. Captain Abney produced a picture by its agency during one of his recent Cantor Lectures. 2. So instan taneous that a quickly revolving wheel appears stationary when illuminated by it. 3. Fume your paper with ammonia. C. Baker.—Reduce the time of exposure to about one-sixth. F. Curious.—Your samples were much discoloured when they reached us; the spots, as far as we can judge, are metallic, and inherent to the paper. P. P.—Chloride of gold is usually acid; the chalk is added to neutralise. Alpha.—Your experience is not new. Niepce de St. Victor was, we believe, the first to point out a similar result. He found that a black and white surface exposed to light was afterwards capable of impressing an image in the dark. The result you obtained is not unlike his. V. X.—You enclose no prints. The spirit should do no haim, but we should prefer to be without the alum. Doctoring will certainly do no good now; you had better throw down your silver and recover it. Photographer.—We regret that your question has been over looked. We have searched Nos. for June 1 and June 8, but do not find the article. You say it was in the News of • June the 4th, 1883,” but no No. appeared on that date. G. Haberer.—MM. Ferrier et Soulier, of Paris, used to publish largely, but the firm now is, we believe, M. Leon Levy. Herr L. Schrank, of Vienna, also publishes. A. D. S.—‘‘English tracing paper won’t do, it goes yellow in a week” See Mr. V. Blanchard, in “ Studios of Europe.” If this had caught your eye, it would have saved you some trouble. Papier Mineral is a paper many photographers employ for the purpose, but we think that a paste, thick or thin, as you may desire, would answer well enough, and this you could remove again with warm water at any time. L. L. W., I. C. Johnson, K. K., and others, next week. ■ ■ PHOTOGRAPHS REGISTERED. Mr. W. Mayland (Deal)—Photo. Sea View, Our Father; Far a way were Angels Dwell. Mr. Lennox Bnowx (London)—Nine photos, of the Larynx. Mr. G. W. Austen (London) — Oil Painting of Superintendents of the Prudential Assurance Company. . . Mr. W. J. Bnrggs (Enfield)—Two photos, of St. Mary Magdalene Church, Enfield. Mr. B, SLIXGSBY (Lincoln)—Photos. Expedition; I’m Coming i Ready.
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