US358774A

US358774A - Mbuil-bonnaud

Info

Publication number: US358774A
Authority: US
Publication date: 1887-03-01
Anticipated expiration: 1904-03-01

Description

UNITED firnrns PATENT @rrrsn.

JEAN BAPTISTE GERMEUlL-BONNAUD, OF LONGTON, COUNTY OF STAFFORD, ENGLAND.

PROCESS OF PRODUCING COPIES FOR LITHOGFAPHY FROM PHOTOGRAPHS- SPECIPIC'ATION forming part of Letters Patent No. 358,774, dated March 1, 18187.

Application filed January 15, 1887. Serial No.224AEI3.

(No specimens.) Patented in France August 28,1885, No. 170,889; in Eng land November 9, 1885, No. 13,609, and in Germany November 125, 1885, No. 35,434.

To all whom it may concern.- I

Be it known that I, JEAN Brr'rrs'rn Gna MEUIL-BONNAUD, of Longton, Staffordshire, England, have invented a certain new and useful Improvement in the Process of Producing Copies for Lithography from Photographs and other Designs, (which improvement has been patented in Great Britain by Letters Patent No. 13,609, dated November 9, 1885; in France by Letters Patent No. 170,889, dated August 28, 1885, and in Germany by Letters Patent No. 35,43at, dated November 13, 1885,) of which the following specification is a full, clear, and exact description.

This invention relates to a process for pro ducing on lithographic stones or plates copies from photographs or other designs suited for lithographic printing; and it consists,mainly, in the production of an artificial grain on the photograph or drawing, enabling impressions to be taken froma smooth stone or plate either on paper, porcelain, or other materials. For this purpose a photograph or other design is covered with a coating, transparent or semitransparent, composed asfollows: About fifty parts, by weight, of starclrflour are dissolved in one hundred parts of water at about 70 centigrade, to which are added about twenty parts of gum-arabic and twenty parts of sugar. This compound is intimately mixed while heated on a water bath until it becomes a homogeneous mass, and to this is then added about thirty parts of kaolin. When the whole has been formed into a paste of a somewhat liquid nature, it is ground down by means of a glass muller until it has attained the requisite degree of fineness. This compound is then carefully spread upon the photographic or other design, taking care to avoid all lumps or unevennesses, and this is allowed to dry while stretched on a board by means of drawing-pins. Vhen the drawing is dry, the outline is traced upon it by means of a pen and dilute lithographic ink, and the half-tints are putin by means of alithographic crayon, copying as nearly as possible the shadings of the original, which may be readily done without requiring any great skill or any special knowledge of lithography.

the paper is slightly moistened, and is then applied to the stone or zinc plate, which is also slightly moistened and heated in the first instance. After pressure has been repeatedl y applied, boiling water is poured over the paper, which is then removed, leaving the design upon the stone or plate. This is now left for about five or six hours, after which it is inked and impressions taken in the usual manner. By these means an outline drawing or engraving can also be converted into a shaded lithograph.

Instead of imparting the necessary grain to the compound by which the design is transmitted to the stone, a paste or coating of the following composition is spread on. the photograph: water, one hundred parts starch, forty parts; gum, twenty parts 5 sugar, ten parts, the whole being boiled. The photograph or drawing, tolerably thickly coated with this compound, is allowed to dry, and after slightly moistening it is pressed on a lithographic stone or plate on which the necessary grain has been produced, so that this grain is impressed upon the surface of the coating. The design is then drawn upon this grained coating, and is then transferred to the stone in the same way as above described.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim isa 1. The method herein described of producing a copy of a photograph or drawing upon a lithographic stone or plate by first forming on the photograph or drawing a coating havinga grain produced artificially thereon, then tracing upon the said coating withlithographic ink a copy of the photograph or design, and, lastly, transferring such design to a smooth stone or plate, substantially asdescribed.

2. In the process of transferring a photograph or drawing onto a lithographic stone or plate, the improvement consisting in producing a grained surface upon the photograph or drawing by the application thereto of a compound containing kaolin, substantially as and for the purposes herein described.

3. In the process of transferring a photograph or drawing onto a lithographic stone or plate, the improvement consisting in producing a grained surface upon the photograph or drawing by applying thereto a coating, which is then pressed upon a grained stone or plate, so as to have the grain thereof imparted to it, substantially as described.

4. The method herein described of transferring to a lithographic stone or plate a design produced by drawing with lithographic ink on a photograph or drawing coated with a gelatinous composition,by moistening the photograph or drawing, and also moistening and I heating the stone or plate, then applying the 20 former to the latter under pressure, and, after pouring boiling water on the photograph or drawing, removing the same, leaving the de sign on the stone or plate, substantially as described. In witness whereof I have hereunto signed my-nanie in the presence of two subscribing witnesses.

JEAN BAPTISTE GERillEUlL-BONNAUI). \Vitnesses:

GEORGE EDWARD WALKER, AUG. SPICAUD.