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394 THE PHOTOGRAPHIC NEWS. [June 22, 1883. Patent Untelligence. Notices to Proceed. 1380. Richard Brown, and Robert William Barnes, and Joseph Bell, all of the city of Liverpool, in the county of Lancaster, for an invention of “ Improvements in and relating to the preparation of pictures and photographs to be used in the production of pictures by the art of photography and photo-engraving, and in the production of gelatine reliefs and printing surfaces therefrom.”—Dated 15th March, 1883. 1229. Alfred Horace Dawes, of Brook Cottage, Windermere, in the county of Westmorland, for an invention of “ An im proved process, system, or method of producing permanent coloured photographic card pictures.”—Dated 7th March, 1883. Patent Void through Non-payment of Duties. 2304. William Phillips Thompson, of the firm of W. P. Thomp son and Co., Patent Agents, of 6, Lord Street, Liverpool, in the county of Lancaster, and 323, High Holborn, in the county of Middlesex, Civil Engineer, for an invention of “ Improve ments in and relating to copying plans, drawings, documents, and other pictures or like objects composed of black and white (or their equivalent photographically) by photographic means, and in compositions therefor.”—A communication to him from abroad by Monsieur Adolphe Joltrain, of Paris, in the republic of France.—Dated 8th June, 1880. This invention consists in a new or improved photographic process known in France as the ‘ gommo ferrique ’ process for directly reproducing drawings, plans, &c., having nearly black strokes on a white ground upon all kinds of surfaces, paper, tex tile fabrics, earthenware, porcelain, &c. My new sensitive liquid possesses the following advantages over processes already discovered:—It has a sensitiveness requiring a few seconds in bright sunshine, and a few minutes in diffused daylight; and, moreover, in the densest fog it gives results much blacker than negatives, counter-drawings, &c., permit of obtaining under good conditions by the ordinary methods. The photographic paper prepared with this liquid gives results of a degree of fineness never hitherto obtained; it works with such delicacy that it allows of the reproduction of drawings executed merely in ordinary crayon ; finally, the correct time of exposure in printing can be exceeded by as much again without damage to the result, and the reaction in the developing baths takes place instan taneously. My sensitive liquid can be applied by machine or by hand over the substances (subjectiles) to be acted upon, and in one coat, or several, according to the nature of the material to be coated and the intensity required. The gum, which it contains in great quantity, plays a very important part because of its insolubilizing properties, which preserves those portions which are to remain white when under the action of the developing bath. The composition of the “ gommo ferrique ” sensitive liquid is as follows :—Gum, 25 grammes ; chloride of sodium, 3 grammes ; perchloride of iron at 45° Baume, 10 cub. cents.; sulphate of peroxide of iron, 5 grammes ; tartaric acid, 4 grammes ; water to fill up to 100 cub. cents. In the preceding mixture 7 cub. cents, of crystallizable acetic acid (per 100 cub. cents.) can be employed instead of the tartaric acid. The above quantities are modifiable to suit the surfaces to be impregnated with the liquid, also according to the state of the atmosphere and the degree of sensitiveness required. I discovered that the employment of tartaric acid combined only with the perchloride of iron, and a thickener was not susceptible enough to produce results of any utility. The addition of the sulphate of peroxide of iron totally changes the properties of my sensitive liquid. The use of chloride of sodium is optional ; it facilitates the rapidity of reaction in the developing bath. The developing bath can be a solution more or less concentrated of ferrocyanide ( “ cyanure ”) of potassium, red or yellow, acid or alkaline. The printing is done by the light in the ordinary condition, the sensitive paper being placed behind the negative, counter-drawing, &c.; after a sufficient exposure the proof is developed in the developing bath (red or yellow) prussiate of potash. The parts which have been kept from the light by the lines take a dark green tint, whilst the remainder of the sheet does not undergo any change. The proof is now washed with ordinary water to get rid of the prus siate and stop the re-action, and is then put for several minutes into an acidulated bath (acetic hydrochloric, sulphuric acid), where matters injurious to bleaching are removed, and the lines take a black shade approaching to indigo. It is again washed with pure water, and dried. Having now given the description exactly as communicated to me by my foreign correspondent, except the alteration of cyanide to ferrocyanide in the last paragraph but one, the former being evidently an error of the French copyist, I wish it to be understood that what I believe to be new, and desire to claim under the hereinbefore in part recited Letters Patent, is,— 1. The gum ferric solution, giving directly proofs in indigo black shade upon a white ground, containing two salts of iron, tartaric or other similar acid, and an insolubilizing material, such as gum or gelatine. 2. The application of a developing solution, consisting of red or yellow prussiate of potash, or metallic solutions, such as salts of silver, zinc, and the like, to a surface impregnated with salts of iron and other chemicals for the purpose of making a dark or blue black lined or marked positive direct from an original with photographically dark or opaque lined or marked negative. 3. The process of photograping a print or other picture com posed only of black and white or monochrome and white, in which the dark lines or marks of the original are reproduced directly on the copy as dark lines or marks without the inter mediation of a negative, substantially as herein described. The greater part of this invention is covered by a previous patent of Pellet. Patents Granted in Pranee. 152,139. Oros, for “ A photographic shutter with instantaneous action.”—Dated 16th November, 1882. Class 17. 152,615. Arrovr, otherwise TAILFEE and Clayton, for “Em ploying eosine in gelatino-bromide photography.” Dated 13 th December, 1882. Class 17. Certificate of Addition. 105,161. Despaquis, for “ Albertype process.”—Dated 16th November, 1882. Class 17. Specifications Published during the Week. 5086. R. Brown, R. W. Barnes, and J. Bell, “ Printing sur faces from gelatine reliefs.”—This specification was printed in full on page 265 of the present volume. 5131. H. H. Lake, fora “Process of and apparatus for producing coloured photographs.”—A communication from J. Chaine, A. Durand, and S. de Chaligny. Heretofore coloured photographs have been produced by the application of ordinary oil colours to the back of the photograph, which has been previously rendered transparent by any suitable process. This application, thus effected, had the great incon venience of producing a photographic picture which deteriorated very rapidly, turned yellow, and upon which stains appeared by reason of the decomposition of the oil colours. According to the present invention, I employ the same process of direct application of the oil colour to the back of the photograph, which is first made transparent, but I render this colour permanent. For this purpose I use a bath, a table, and an oven all as herein after described. These three apparatuses I will describe with the different manipulations which are necessary from the com mencement of the use of the bath to the end of the use of the oven. The bath has a double casing, and is arranged to have a circulation of hot water, steam, or hot gas of any kind around it, which serves to maintain in a liquid state the products designed to fix the image upon the photograph, and render the said photo graph transparent. In order to avoid loss of heat, the cover is provided with a covering of felt or other non-conducting material held in place by an envelope. Two cocks permit the ingress and egress of the hot water, steam, or gas. As above stated, the object of this bath is to maintain in a liquid state the materials designed to fix the image on the photograph, and to render the same transparent. After remaining a suitable length of time in the bath, the photograph is withdrawn, care being taken to pass it between the curved wall of the bath, and the edge of the india-rubber of the cover, so as to remove as much much as possible of the liquid with which the photograph is impregnated. The photograph is then placed upon the table. This table is composed of a metallic case closed at all parts, the upper side of which is horizontal and properly faced, whilst the bottom is inclined in order to conduct towards the lowest point the products of condensation, if the case is heated by means of gas or steam, or the deposits, if it is heated by hot water. Two stop-cocks permit the ingress and egress of the hot water, steam, or hot gas, into and from the case. When the photograph is taken out of the bath, it is placed upon this table, which has a double bottom or casing for the circulation of hot water, steam, or hot gas of any kind around it, and which is kept at a suit able temperature to maintain in a liquid state the surplus liquid