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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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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1303, August 24, 1883
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The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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538 THE PHOTOGRAPHIC NEWS. [AvaUsT 24, 1883, Patent Entelligence. Application for Letters Patent. 3948. Joseph Julius Sachs, of 8, Union Court, Old Broad Street, in the city of London, for an invention of “ Improve ments in the manufacture of pliable plates and surfaces as a substitute for glass for photographic and other purposes.”— A communication to him from Messieurs Fickeissen and Becker, resident at Villengen, Baden, Germany.—Dated 14th August, 1883. Notices to Proceed. 1870. William Lloyd Wise, of 46, Lincoln’s Inn Fields, in the county of Middlesex, for an invention of " Improvements in and pertaining to apparatus for utilising solar heat.”—A com munication from La Socit Centrale pour 1’Utilisation de la Chaleur Solaire (Brevets Mouchot et Abel Pifre), of Paris, France.—Dated 12 th April, 1883. 1971. William Cooke, of 43, Southampton Buildings, Holborn, in the county of Middlesex, Civil Engineer and Patent Agent, for an invention of “ An apparatus for automatically exposing bodies oi articles to the action of the sun’s rays or to light otherwise produced.”—A communication to him from abroad by Richard Schlotterhoss, of Vienna, in the empire of Austria, Engineer.—Dated 18th April, 1883. 3837. William ROBERT Lake, of the firm of Haseltine, Lake, and Co., Patent Agents, Southampton Buildings, London, for an invention of “ Improvements inadj ustable chairs, chiefly designed for photographic purposes.”—A communication to him from abroad by William Shields Liscomb, of Providence, Rhode Island, United States of America, Gentleman.—Dated 7th August, 1883. Patents Sealed. 1061. William ROBEBT Lake, of the firm of Haseltine, Lake, and Co., Patent Agents, Southampton Buildings, Landon, for an invention of “ An improved process for sensitizing photo graphic paper, and developing pictures thereon.”—A commu nication to him from abroad by Redfield Benjamin West and Benjamin Corey West, both of Guilford, Connecticut, United States of America.—Dated 27th February, 1883. 1007. James HESIY Hare and HENRY JANES Dale, both of Little Britain, in the city of London, for an invention of “ Improved apparatus for supplying sensitive plates in photo graphic cameras.”—Dated 24th February, 1883. Patent Filed. Julius Allgeyer and Carl BOLHOEVEN. No. 896.—Dated 19 th February, 1883. This invention has for its object to obtain from drawings, wood-cuts, photographs, and other pictures, relief plates, which may be used for printing simultaneously with letter-press. For this purpose a heliotype (sun-print or Lichtdruck) is first pro duced on a plate prepared like ordinary heliotype plates, except that chloride of calcium in the proportion of one part of the chloride to five parts of the gelatine, or other substance capable of producing a “grain,” has been added. The heliotype plate is exposed to light under a diapositive, rolled over with greasy ink, and the image is either immediately strengthened by strew ing graphite powder or some other suitable coating over it, or an impression is made from it on a gelatine foil, which impres sion or copy may also be strengthened in the manner described. By either method a grained negative is obtained, which in one case is right-handed, and in the other case left-handed. Under one of these grained negatives a film chiefly composed of bichro mate and glue, and prepared in the manner hereafter described, is. exposed to light. The back of this film is subsequently fastened on to a wood block to the exact height of type to be used with it. Those parts of the picture on the wood block which have not been acted on by the light are now mechanically removed by friction with moderate damping, and by this means the required relief is produced, which may be used in combina tion with letter-type for printing on the ordinary type printing press. From the same relief plate an electrotype may be pro duced, in the same manner as from ordinary engraved blocks. The exposure of such a sensitive film to light is equally success ful with a lined negative. The film destined to receive the picture, and to serve as a printing surface, is prepared in the following manner:—One kilogramme of glue (Cologne glue) is soaked in one litre of water for several hours, then dissolved by adding thirty grammes of bichromate of potash and 12 grammes of glycerine, and placing the vessel containing the mixture in a warm water bath. A suitable quantity of the mixture is then poured on glass plates which have been previously coated with a solution of ox-gall. The film of prepared glue thus disposed of is then allowed to dry in a dark place. When well dried, it is scraped perfectly even with an edged instrument, then taken off from the glass plate, and exposed under a negative in the manner hereinafter described, care being taken to expose that side of the film which adhered to the glass. The claiming clauses are as follows :— 1. The production of grained negatives (a) by the direct use of heliotpye plates containing chloride of calcium or any other suitable grain-producing substance, which heliotype plates have been inked in, and the image strengthened by the addition of graphite powder or any other suitable coating ; (4) by the use of an impression taken on a gelatine foil, and strengthened in a similar manner. 2. The production of printing blocks by pouring chrome glue over a plane of glass plate, previously prepared with a solution of ox-gall, allowing the film to dry, exposing under a grained negative (which may be obtained as indicated in the preceding claim) or under a lined negative, that side of the film which has adhered to the glass, attaching tbe other (back) side upon a bare plate, and developing the relief by means of damp friction, for the purpose of using such blocks directly in the type printing press, or for obtaining printing blocks by means of electro plating in the manner well known. Specification Published during the Week. 6114. STEPHEN Henry Emmens, of Soho Square, in the County of Middlesex, Actuary, and John Munro, of West Croydon, in the county of Surrey, “ Improvements in photometric apparatus” Dated 22nd Dec, 1882.—A comparison photometer in which the equilibrium of the lights is established by an ad justable prism or wedge of tinted or obscured glass. Patents Granted in America. 281,660. Edwin L. BERGSTRESSER, of Hublersburg, Fa., for “ A photographic-plate holder.”—Application filed 21st April, 1883.—No model. 281,743. Hawley C. White, of North Bennington, Vt., for “ A stereoscope.”—Application filed 17th May, 1883.—No model. LESSONS IN OPTICS FOR PHOTOGRAPHERS. BY CAPTAIN W. DE W. ABNEY, R.E., F.R.S. Lesson V. Oblique Excentrical Rays.—Take a lens, and cover all up with black paper except a line of bare glass passing through its centre, and then use it with a camera which has a largo Fig. 25. focussing screen. Cover up the line of glass, except the portion A B, and focus a distant object, making a large angle with the axis of the lens, and measure the distance Fig. 26. from O ; it will be found to be O F. Cover up next all ex cept the portion B C, and again focus, when the image win be found to be sharp at a distance, O G. Similarly focus
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