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294 THE PHOTOGRAPHIC NEWS. [April 10, 1891. Qatent Intellgence. Applications for Letters Patent. 5,591.—Wilhelm Heinrich Conrad Bernitt, 45, Southamp ton Buildings, London, “ Improvements in Apparatus for Producing and Delivering Photographic Pictures in exchange for Coin deposited therein.”—March 31st. 5,627.—Richard Warhen Stewart, R.E. Office, Devonport, “ Taking Photographs of Small or Large Angles up to 360°.” —April 1st. 5,800.—Thomas Scott and James Davenport, 70, Deansgate, Manchester, “ Improvements in Photographic Dark Slides.” (Complete Specification deposited.)—April 4th. 5,833.—James Yate Johnson, 47, Lincoln’s Inn Fields, Lon don, “Improvements in the Manufacture or Production of Sensitive Paper for Photographic Purposes. (Pierre Mercier, France.)—April 4th. Specifications Published. 16,982. October 28th, 1889.—“ Colours.” C. H. Wilkinson, Colne Valley Works, Slaithwaite, Yorkshire. Relates to a system of colouring in which a scale or octave of colour is arranged corresponding to the diatonic scale in music. Consists in setting the primary colours, red, yellow, and blue (sic), to correspond to the notes C, E, G, of the common cord in the natural key, and then mixing these colours in proportions founded on the relative rates of vibration of the notes in the musical scale, in- order to produce the remaining prismatic colours, orange, green, indigo, and violet, to corres pond to the notes D, F, A, B. Intermediate colours are obtained corresponding to sharps and flats by mixing the prin cipal colours on each side of them. The ascending and descending octaves of these colours are produced by mixing them with certain proportions of white or black. The system comprises also diagrams of colour harmonies consisting of notes, chords, or scales, in ranges or keys corresponding respectively to the notes, chords, scales, and keys of music. The system is applicable for use by textile manufacturers, dyers, printers of colour on calico, paper, floorcloth, &c., colour makers, paper makers, ink makers, painters, designers, artists, &c. 17,006. October 28th, 1889.—“Stereotype.” D. Reid, 143, Flinder’s Lane, Melbourne, Victoria. Key for securing stereotypes to their base blocks. The key is composed of two pieces of metal secured by rivets, and having bent edges to fit the grooves in the stereo and base block. The edges may be bent to different angles to suit the dovetail of the grooves in the blocks. The plates forming the key are in short lengths, the upper ones breaking joints with the lower. The upper plates of the key are capable of slight lateral movement, the rivet holes being elongated for this pur pose. Patents Granted in America 448,825. December 4th, 1889.— “Dissolving Shutter for Magic Lanterns.” John Shannon, Wixom, Mich. Serial No. 332,600. No model. Claim.—-A frame for receiving and displaying pictures in a magic lantern, such frame having an advance and sidewise moi ement in either direction for bringing its ends alternately in position for display purposes. In combination with a movable shutter actuated through the movements of the frame, substantially as and for the purpose specified. 448,821. January 7th, 1891.— “Picture Frame.” John F. M'BRIDE, Chicago, Ill. Serial No. 376,952. No model. Claim.—In a picture-frame, the combination of a back, a front formed of a sheet of suitable flexible material cut to form sections bent back to produce the display opening, having convex bulging margins, and ornamental fastenings, securing the sections at their free ends to the frame. As a new article of manufacture, a picture frame, having the back and the front of sheet celluloid severed by a cross-cut through the centre, thereby forming V-shaped sections bent back to produce the display opening, having convex bulging margins and ornamental fastenings, securing the sections at their apexes to the frame, substantially as described, 448,692. January 31st, 1890.—“Implement for Mounting Pictures on Glass.” Richard H. L. Talcott, Boston, Mass. Serial No. 338,752. No model. Claim.—An implement for mounting picture sheets on glass, consisting of a suitable handle or stock having secured on and projecting from its forward portion a metallic plate having a thin and continuous rigid edge, and a sheet of rubber by its intermediate portion overlying said edge, and by its terminal portions extended therefrom and under tension. The carrying body or stock provided with the kerf, the metallic blade or tongue inserted in said kerf, and the sheet rubber by its intermediate portion covering the edge of said tongue, and by its terminal portions confined upon the opposite sides of the stocks, substantially as described. 448,801. February 48th, 1890.—“Photographic Roll-Holder.” Hermann G. RANISPERGER, New York, N.Y. Serial No. 340,862. No model. Claim.—In a roller-holder, a perforating device adapted to penetrate the film, and a measuring device adapted to enter the perforations. The measuring device held in contact with the film by spring pressure and adapted to enter the film. In a roller-holder, a perforating device, a measuring device co-operating with the perforating device, and a lock actuated by the movement of the measuring device to lock one of the rolls. The combination, with the supply and receiving rolls and the film support, of a perforating and measuring device acting at opposite edges of the film support. The combination, with the supply and receiving rolls and the film-support, of a perforating device, a measuring device, and a common tumbler, or its equivalent, for actuating the per forating device and for withdrawing the measuring device. Correspondence. THE NEW RAPID IRON PROCESS. Sir,—It will perhaps put to rest Mr. W. E. Debenham’s conscientious scruples if the history of the discovery of the new sensitive compound is laid before the world. As Mr. Deben- ham is so anxious to know who was the discoverer—Mr. Friese Greene or myself—I may tell him we both claim a share in the discovery. We started upon the work by making a definite study of a series of experiments. These pointed out a direct line of investigation to be undertaken. Mr. Greene having special facilities for carrying out experiments, very speedily was on the right track, and followed it until the new sensitive compound reached its present perfect stage. In thus working together we have further succeeded in rendering the process more sensitive by a discovery I had the good fortune to make. Having, as I believe, fully apportioned the respective shares in the credit of this discovery, I would like to add that you were right in calling attention in your issue of last week to an error which had crept into an article in Nature, attributing the dis covery solely to me, whereas Mr. Friese Greene’s name should have been mentioned as well. At the lateness of the hour by which Prof. Meldola concluded his discourse, and my anxiety to get through with the experiments and not keep the audi ence unduly waiting, it did not occur to me, or I would have most certainly drawn attention to the omission of Mr. Greene’s name. Frederick H. VARLEY. April 8rd. NATIONAL PHOTOGRAPHIC EXHIBITION, APRIL, 1891. Sir,—Owing to the decision of the Liverpool Exhibition Committee to keep their Exhibition open until the 11th inst., and as many of their exhibits are entered for the Crystal Palace, I beg to inform you that it will be impossible for the judging here to take place before Thursday, April 16th. S. G. Buchanan Wollaston. Crystal Palace Co., Crystal Palace, S.E., April 6th. PHOTOGRAPHIC Club.—Subject for discussion Wednesday, April 15th, “Printing on Emulsion Papers”; April 22nd, “The Keeping Qualities of Developers,” and “A Special Selection of Slides,” by Mr. Frank Haes,