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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. 1275, February 9, 1883
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Zeitschrift
The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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90 THE PHOTOGRAPHIC NEWS. LFEBRTARY 9, 1883. Perhaps the time will come when plates of such sensi tiveness will be prepared that the special artist who is sent to sketch scenes of public interest will not take his pencil, but his camera. Some such contrivance would cer tainly have been an advantage during the past few days. All the illustrated papers have given portraits of the chief actors in the trials now going on at Dublin, and all the artists have contrived to differ from each other most wofully. Had the witnesses to depend upon the portraits, the chances of identification would be poor indeed. Mr. T. C. White, the President of the Quekett Microscopical Society, whose clever paper on micro-photo graphy we published a fortnight ago, has been very suc cessful in delineating the structure of a tooth by the aid of the camera. An enlarged photograph of a section of a tooth shows not only its intimate structure, but nerve, artery, and manner of growth, in a manner so striking that the student at once appreciates every detail. Placed beside the microscope, so that the observer can refer to the photograph from time to time, the picture furnishes a wonderful aid to teaching. Aatent Entelligente. Notice to Proceed. 4651. John Young McLellan, of Glasgow, in the county of Lanark, North Britain, Analytical Chemist, for an invention of “Improvements in artificial-light apparatus for photographing, and applicable otherwise.”—Dated 30th September, 1882. Patent Granted in America. 270,785. William E. Goodenough, of Newark, N.J., for “ An extension photograph frame.”—Application filed 21st Septem ber, 1882. Model. Specifications Published during the week. 3013. H. H. Lake, for “ Fixing photographic pictures upon earthenware, porcelain, &c.”—A. communication to him from E. J. Irlande. It has heretofore been proposed to produce upon earthenware, china-ware or porcelain, glass-ware, and the like, photographic pictures or representations; for this purpose the carbon pro cesses of photography have specially been employed. It has not, however, been heretofore practicable to render such pictures or representations unchangeable or permanent; they disappear when washed or subjected to friction. The object of this invention is to provide a process of fixing which prevents such change or alteration of the photographic pictures or representations. In carrying the said invention into practice, 1 apply, in the ordinary manner, to the earthenware, porcelain or china-ware, opal-glass, glass-ware, plate or other glass, or the like, the photographic pictures or representations in carbon by the ordinary well-known means, by employing paper prepared with coloured carbon ; that is to say, after having obtained from the negative an impression upon this paper, I apply it in the dark to the earthenware porce lain or china, glass, or other material which has been previously gelatinized in a cold bath of two or three degrees. The paper, after having had the impression produced on it, and been applied to the glass or other surface, is developed in the dark by treat ing it with hot water, which dissolves the parts not affected by the actinic action of the light, and the parts whereon the im pression is produced remain adherent to the glass, porcelain, or other material. The representations applied may be drawings, images, portraits, landscapes, letters, scenery, symbols, figures, or the like. The photographic image in carbon is enclosed in a thin coating of sensitized gelatine. By washing with water or by friction this gelatine may be dissolved or detached. I fix it by a kind of enamelling by operating in the following manner ; that is to say, I spread with a brush a layer of boiled oil or oil-varnish or alcohol, with or without the addition of a small quantity of spirits of turpentine. I carry to an oven or kiln the objects thus decorated and varnished ; the heat spreads and renders regular the coating of varnish, obliterates all traces of the strokes of the brush, and hardens the varnish, which then forms a resisting glaze which protects the photographic image in carbon. The pieces taken from the oven or furnace are treated with pumice by the ordinary means ; the photographs thus obtained are absolutely transparent and very clear. Piiorto the application of the var nish for fixing the subject or picture upon the glass, porcelain, or other material, the photographs may be coloured in order to give to the subject a natural colour.—Provisional Protection only. 3035. G. Habe, for “ Photographic cameras.” The invention relates to improvements in photographic cameras, and has for its object the production of a lighter, simpler, and more compact portable camera than those heretofore in use. For this purpose I form the body of the camera of a back frame, con nected by a bellows body, to the front of the camera; to the lower and front side of the back frame is hinged the base-board, which is so angled at its rear edge as to enable the sensitive plate to. be fixed either at a right angle, or at an angle more or less than a right angle thereto, and I fix the base-board and the back frame at the required angle to each other on one side by means of a link pivotted at one end to the base-board, and provided at the other end with a pinching screw running in a slot in the back frame, a notch being formed in one side of such slot to indicate when the parts are at right angles to each other. The other side is held by means of a bracket hinged to the back frame, and extending forward nearly to the front of the base-board, where it is held by a pinching screw carried by the base-board acting upon a plate fixed by the bracket. The front of the camera is provided on its bottom edge, at each side thereof, with a pinching guide plate working in a groove in the base-board, and this groove and the pinching guide plate are partially covered at one side by a plate or runner fixed to a slide working in the base-board, such plate serving as a guide or runner for the front to run upon and clamp ; the pinching guide plates are capable of being tightened or loosened by means of a thumb-nut acting upon a screw con nected to each of such pinching guide plates. That side of the back frame which carries the bracket is made broader than the other parts of such frame, in order to bring the bracket outside of the base-board when the latter is turned up against the back frame, thus enabling the bracket, in combination with a hook or catch on the base-board, to be used as a means for holding the camera in its collapsed position. The slide carrying the front of the camera is moved to and fro, as desired, by racks and pinions, as usual, and the camera can be supported in use either on the base board, or on the bracket side thereof, nuts being fixed in such parts for the purpose. In some cases I dispense with the bracket, and employ a pivotted link and pinching screw at each side of the back frame, which latter I make of similar shape on both sides thereof. None of the parts are required to be removed, either for adjusting for use, or for packing up the camera.—Provisional Protection only. PHOTO-LITHOGRAPHY AND PHOTO ZINCOGRAPHY. BY MAJOR J. WATERHOUSE, B.S.C., Assistant Surveyor-General of India. Chapter VI.—The Preparation of the Photo-Transfeb Paper—(continued). Mr. Herbert DEVERILL, Government photographer in New Zealand, finding a good many inconveniences in working Osborne’s process, obtains the advantage of the insoluble coating which forms its essential feature by adding a small proportion of chrome alum to the gelatine solution used for coating the paper (from 4 to 10 grains to the ounce of gelatine). This renders the gelatine insoluble, without making it unabsorbent of water. The gelatinized paper can be kept for any length of time, and when required for use is sensitized by floating for a few minutes on a saturated solution of bichromate of potash, and, when sensitized, is said to keep in good working order longer than other papers. The prints are inked in the press, and washed off in cold water. Mr. Deveril claims for this method the advantage that the white portions of the transfer, being still covered with the original coating of insoluble gelatine, are yet capable
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