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The photographic news
- Bandzählung
- 29.1885
- Erscheinungsdatum
- 1885
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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. 1374, January 2, 1885
- Digitalisat
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Zeitschrift
The photographic news
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Band
Band 29.1885
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- Register Index III
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Band
Band 29.1885
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- Titel
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Mine have been in use for several months, and have merely required the addition of an ounce of water from time to time to replace that lost by evaporation. atent ntelligence. Applications for Letters Patent. 16,861. William Speirs Simpson and James Francis Sutton, 166, Fleet Street, London, for “ A new or improved means of reproducing drawings, photographs, engravings, and prints.” —Dated 23rd December, 1884. 16,694. Emanuel Falk, 323, High Holborn, London, W.C., for “ Improvements in the production of half-tones or ‘grain ’ in plates or surfaces for photo-mechanical printing.”—Dated 19th December, 1884. 16,727. Israel Todd, Crossley Street, Halifax, for “Improve ments in double dark slides for use in cameras for photographic purposes.”—Dated 20th December, 1884. 16,970. Henry Harris Lake, 45, Southampton Buildings, London, for “ Improvements in stands, chiefly designed for photographic cameras.” — Communicated by A. Stegemann, Berlin.—Dated 27th December, 1884. 16,976. James Brown Jordan, The Elms, Cherry Orchard, Staines, for “ Recording the duration and intensity of sun shine.”—Dated 29th December, 1884. 16,979. T. SCHENKENHOFER, Hamburg, Barmbeck, for “ Pro ducing photographic prints of all kinds of drawings with the pen, brush, and lead-pencil direct from the drawings, without applying either wet or dry plates, camera and lenses, conse quently to be named briefly photography without camera (Leukography)."—Dated 29th December, 1884. Patents Sealed. 114. Henry Vander WEYDE, of Regent Street, in the county of Middlesex, Artist, Electrician, and Photographer, for " Im provements in producing vignetted photographs.”—Dated 1st January, 1884. 4906. Arthur Fullerton Howman, George Street, Oxford, Oxfordshire, Photographer, for “ Dark slide for photographic cameras.”—Dated 14th March, 1884. Specification published during the week. 2312. Alfred GEORCE Brookes, of No. 55, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent Agents, for “ Improvements in the method and apparatus to be employed in the preparation of surfaces for printing or etching by the aid of photography.” Dated 29th January, 1884.—Complete Specification. The invention relates to an improved process for the manu facture of photographic negative and positive plates hatched or grained of glass, paper, or any other suitably transparent or translucent material adapted to the production of types, cliches, or negatives, which can at once in a direct manner be used for the production of highly and deeply etched devices on metals, lithographic-stone, or other suitable materials. The methods or processes hitherto known and in use for the production of cliches, types, or negatives, adapted for the etching on metals, stone. &c., generally require, for the true rendering of the photographic images taken after Nature with their middle tones, one or more intermediate manipulations between the photographic negative and the ultimate surface in the design to be transferred. These methods or processes are therefore wanting in perfect nicety, clearness, or sharpness of contours, shades, and other details. My invention consists first, in a novel mode of producing the grain or “ hatching ” (required for the production of high and deep etchings); and secondly, in a mode of producing this grain ing or hatching in the plate itself, so that it is in intimate con tact with the surface, design, or negative, or the picture itself, and is, so to speak, amalgamated or combined with it, and so that the photographic plates, made for the above mentioned purposes, may be treated in any of the well known methods, and used for the production of the ordinary photographic negatives. For the production of typographic or other like photographic plates (negatives and positives) a transparent grained or hatched plate is required, and for its production I preferably use bichro- matized gelatine. A polished glass plate is covered on one side with chrom. gelatine, to which is added more or less of chrom. kalium (bichromate of potash) according as a coarser or finer grain is required. The plate thus prepared is dried at a tempe rature of, say, 30 c to 70° C., or 86" to 158° Fah. lower or higher, according to the grain required, whereby a very fine grained or stippled surface is produced in the film of chrom. gelatine. The plate is then freely exposed to light during some (say) five to ten minutes, more or less, according to circumstances, and is then well washed and dried in the usual manner. After this the grained surface produced is inked with printer’s ink or suit able composition, and then varnished with negative varnish. In producing hatched typographic positive or negative plates, I employ similar photographic matrices, types or cliches, having thereon the desired hatchings or grainings. As already indi cated, the degree of temperature varies with the character of grain required, and also somewhat with the quality of gelatine; a little practice will enable the operator to regulate the tempera ture. The second part of my invention relates to the production of typographic or such like dry-plates. For this purpose I take gelatine, collodion, emulsion, pellicule, or other similar dry plates, and expose them behind a matrix plate, having a grained or stippled surface prepared according to my invention, or any other transparent mother-plates, types, or matrices in a copying frame, before a ground or semi-translucent roughened glass plate, to either natural or artificial light, and then develop, fix, and wash the plate in any suitable known way. The exposed film or layer on the plate, after undergoing suitable drying, is well tanned or hardened, say, by means of a concen trated solution of alum, and then subjected to an alcohol bath, and covered over with a layer or film or collodion, or leather collodion, or collodion prepared with castor oil, and finally treated with an India-rubber, albumen, or other suitable iso lating solution. The plate is then dried naturally or artificially, and is afterwards covered again with a layer of, or has applied to it, a sensitized solution, gelatine emulsion, or collodion, and dried or allowed to dry. The plate is now ready for employment in the photographic art. After the required exposure and subsequent developing and fixing, the picture appears on a beautiful grained or stippled ground, presenting the predetermined quality of graining or hatching adapted for the picture, and it is thereby rendered particularly suitable for direct, high, or deep etching ; the emul sion layer, proof, or film on the glass plate may be removed therefrom, if so desired, in manner similar to that now employed for a like purpose with the ordinary dry plates. Trade marks, firm-styles, or names and other desired words, cyphers, numbers, or other indications, either by means of im pressions from an india-rubber stamp, or in any other suitable manner, may be applied to the margins or other parts of the plates so produced between the first and second emulsion films or layers, which marks words, numbers, cyphers, &c., then appear after the exposure, development, and fixing of the cliche, type, or negative. When the grained or hatched negative is desired to be pro duced of very large size, and with one sensitive layer for use in effecting the photo-mechanical transfer of direct photographic takings on to large metal plates, cylinders, rolls or drums for high or deep etching, I find the following modification to be well adapted to the purpose, and to give excellent results A polished glass plate is covered with a very fine transparent or diaphanous paper, having upon it the grain or hatching, pro duced by printing or otherwise, in such a manner that by cutting the said paper along the margins of the glass plate such paper may ultimately be removed. This paper, stretched or distended on the glass plate, is isolated by the application of a suitable solution, such, for instance, as raw collodion or chrom.- alum-gelatine, or india-rubber, and after the drying of the solu tion the paper is treated with a sensitive solution of collodion, or gelatine emulsion, in the usual well-known way. After photographic exposure, development, fixing, washing and drying, a second very pure transparent or diaphanous paper is pressed on to the finished negative, so that it adheres to that negative. The whole combined preparation, forming, now one sheet or leaf, is then properly dried and separated, dividing it around the edge or margin. The negative or positive, being covered on both sides by the transparent or diaphanous paper, can be copied from either side, without sacrificing its distinct ness or sharpness of details, whilst it is moreover protected from injurious atmospheric influences. Such a negative or positive sheet or film as has just been described, will be found extremely useful in and adapted to
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