The photographic news

• Bandzählung: 35.1891
• Erscheinungsdatum: 1891
• Sprache: Englisch
• Signatur: F 135
• Vorlage: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: SLUB Dresden
• Rechtehinweis: Public Domain Mark 1.0
• URN: urn:nbn:de:bsz:14-db-id1780948042-189100009
• PURL: http://digital.slub-dresden.de/id1780948042-18910000
• OAI: oai:de:slub-dresden:db:id-1780948042-18910000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

310 THE PHOTOGRAPHIC NEWS. [April 17, 1891. work exhibited that evening, which their assistant secretary had said was given to Dr. Lindsay Johnson with reluctance, as the worst specimen M. Lippmann had ever taken. He would ask their secretary if the specimen had been exhibited to the Photographic Society of Great Britain that evening with Professor Lippmann’s knowledge and consent. The Assistant Secretary replied that he did not know. Mr. Harrison continued that, therefore, any public discussion upon it might be unjust to M. Lippmann, who had proved the truth of the theory, first published by Lord Rayleigh, that heliochromes were due to the interference of light, and could be fixed. It was too late in the day to question the genuineness of the discovery, which had been recognised by the members of the Academy of Sciences of Paris and the Photographic Society of France, many of them accomplished men of science, and all truthful and honourable gentlemen, which meant a great deal. Mr. H. M. Elder said there were three different methods of producing photographs in colour : that of Niepce de St. Vic tor, which was the plan adopted by Mr. Warnerke ; the method of diffraction scattering small particles ; and Lippmann’s method, founded on Lord Rayleigh’s paper on wave motion in a loaded medium. The Chairman, in thanking Mr. Willis for his paper and demonstration, and Dr. Lindsay Johnson for bringing the specimen of M. Lippmann’s work, said that he hoped they might yet see better specimens of the latter kind. In this specimen, although two colours could be seen, there was nothing in the nature of a photograph of the spectrum. Messrs. C. T. Dent, J. H. Waller, and T. H. H. Harrison were elected members. Camera Club. On April 9 th, the day following the close of the Annual Con ference, there was a large gathering at the Camera Club, to attend the flash-light demonstration given by Mr. Cade (of Messrs. Marion and Co.). The “ Slingsby ” apparatus was used, and some very successful negatives were taken of the room and the company. Mr. STRONTEYER showed some prints from negatives taken with magnesium ribbon placed in the ordinary pendant lamp of a room, the lamp being in the picture. One of these showed very picturesque lighting. Dr. Crocker handed round some photographs of medical cases, showing the service rendered by flash-light on such subjects. On Thursday, April 23rd, Mr. Frank Howard will read a paper on “ Photography in Bye-Ways and Field Lanes.” The paper will be illustrated by the lantern. Croydon Microscopical and Natural History Club (Photographic Section). Friday, April 10th.—Mr. F. H. Baldock, F.C.S., in the chair. Mr. J. Wier-Brown explained and demonstrated his system of producing warm brown tones and sepia tones on bromide enlargements. He had slightly, but not materially, altered his mode of procedure since the first publication of the process. A number of landscapes were handed round, showing both brilliant and soft effects in rich brown and sepia. The speaker’s attention' was drawn to a paragraph in a monthly photographic publication, in which it was stated that, if you left a bromide print thus treated for several hours in plain water, you would find the image almost gone. He said this was very misleading, and a most incorrect statement, and might deter some workers from trying the process for them selves. It was true only as regards a print in which the toning had been carried to its extreme point, “a bright red,” a colour which he thought would be seldom desired by photo graphers. That it was entirely untrue as regards prints toned to the warm brown or sepia point, he demonstrated by showing the two halves of a warm sepia proof mounted side by side, one portion of which had been washed in running water for twenty eight hours, without apparent, if any, reduction of the image. Prolonged washing after toning was quite unnecessary, and would not be resorted to by workers except by way of experiment. From five to ten minutes in running water was quite sufficient to remove the faint lemon-coloured stain from the high-lights, after which the prints should be carefully blotted off, and dried in a warm room. Prints so treated had been quite unaffected by all the light to which they could be exposed since they were first produced, and Mr. Weir-Brown stated his belief that they would withstand the action of the most trying atmospheric conditions to which photographs were subject under ordinary circumstances. If not satisfactory, the tone could be removed by prolonged washing, the print restored to its original colour, and afterwards re-toned. The process was put forward for the benefit of those only who wished to make enlargements in tints warmer than the usual black-and-white of bromide, there being already abundant methods of producing every variety of colour on contact prints. The speaker stated that good results could not be produced on the most rapid papers, and that his success had been obtained on an emulsion of medium rapidity called by its makers “ slow.” Mr. W. Low-SaARJEAXT exhibited and explained a novel camera which he had just made for his own use. The camera is of the usual box form, covered with leather, and is divided into two chambers, the upper one being used simply as a view meter, or to focus with for hand-work, and giving a full-sized view identical with that in the lower chamber or camera proper ; the picture thus being seen and focussed at the moment of exposure. A reflector placed at an angle of 45° in the upper chamber throws the image on to a ground glass which is fitted in the top of the camera, the ground glass being covered with a rectangular hood large enough to enable the image to be well seen in the brightest light ; this hood, when not in use, folds down flush with the top of the camera. The lower chamber, or camera proper, is fitted with a swing back and focussing screen for ordinary work. It is also fitted with a specially con structed focussing eye-piece hood, which entirely dispenses with the necessity of using a focussing-cloth. Double backs of a very light pattern are used, and the camera has a range of focus from three to twelve inches. A very ingenious shutter is fitted behind the lens—so that the lens can be changed with out interfering with it—giving a range of exposure from ex treme rapidity to hours if required ; it is discharged by means of a pneumatic ball. A very novel feature in the shutter— which, by the way, gives an equal exposure to every part of the plate—is that, whatever speed the shutter is set to work at—even at its fastest—at the moment of exposure, without any alteration whatever to it, a time exposure of any length can be given. The camera is also fitted with a black glass re flector placed in front of the working lens at the angle of polarisation 33° 15' for photographing clouds. When not in use, the reflector folds into the front of the camera out of the way, or it can be removed entirely. A false bottom with arc shaped struts is attached to the camera to enable it to be tilted to the necessary angle for cloud photography. Although the camera contains so much, and is capable of doing every class of work, it is very compact ; the quarter-plate size, with a 5} inch lens focussed ready for use, only measures externally 8} by 7 by 6 inches. The next meeting will be held in the old school of art room on the 17th inst., when there will be an exhibition of hand cameras. The first excursion of the Photographic Section of the Club took place on April 11th, when, by the permission of the Lord Archbishop of Canterbury, Addington Park was visited. The afternoon was fine, and some good work was done. Birmingham PHOTOGRAPHIC Society. April 9th.—Meeting at the Club rooms, Midland Institute, Mr. W. J. Harrison, F.G.S., in the chair, when five new members were elected. The hon. secretary, Mr. A. J. Leeson, exhibited Wray’s aluminium-mounted lens fitted with iris diaphragms. The lightness was remarkable, and in point of finish perfect. The programme for ensuing session was read as follows :— April 23rd, “ Exposure and Development,” W. J. Harrison ; May 28th, “Stereoscopic Photography,” Walter Griffiths •