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

February 6, 1891.] THE PHOTOGRAPHIC NEWS. 115 The question-box contained the following question : “How are photo-etchings produced ? ” The Chairman said that in principle he believed it to consist in imposing a carbon print upon a grained metal plate. A solution of perchloride of iron was then poured over the carbon picture, and this solution acted through the carbon image, biting or etching the metal beneath it. The metal plate could then be used to print from. The Croydon Camera Club. The first annual meeting was held at the club rooms, 96, George Street, Croydon, the president, Mr.H. Maclean, F.G.S., being in the chair. The report stated that no less than seventy members had been elected since the Society was founded on the 25th Feb ruary, 1890. The accounts show a balance to the good of £16 15s. 4d. t The Club has the sole use of central rooms, open every day to members from 10 a.m. to 10.45 p.m. The following officers were elected to serve for the current year:—Prcsuient—H. Maclean, F.G.S.; Vice-Pres id ent—Dr. H. J. Strong, J. 1*.; Treasurer—Mr. Sargeant ; /fan. Secretary —G. B. White ; Hon. Assistant-Secretary—E. F. Blow. The Liverpool Amateur Photographic Association. A meeting was held at the club rooms, 3, Lord Street, on the 29 th January. Mr. Paul Lange occupied the chair. The following were elected members of the Association : Norman Crook, A. C. Batty, Theodore Hubback, Miss Adams, F. W. Walker, E. S. Sole, and F. H. Elsby. After a vote of thanks had been accorded to the retiring officers of the Association, the President distributed to the successful competitors the medals awarded in the prize com petition of last November. The meeting was then made special to consider certain alterations in the rules of the Association, at the close of which Mr. F. Anyon gave an exhi bition of a new lantern, with which he showed a series of fine slides, some of them of exceptionally high merit. The Bath Photographic Society. A meeting was held at the Royal Literary and Scientific In stitution on the 28th ult., Mr. W. Pumphrey (the president) in the chair. Miss Melita Bird and Mr. Cecil Bralshawe, Mr. Ernest Lambert, Mr. Graystone Bird, and Mr. C. W. Dykes were elected members of the Society. The Chairman drew attention to the proposed visit of the Photographers’ Convention to Bath next July, and a circular was read from the Camera Club inviting members to be pre sent at their Conference, April 7th and 8th next. Mr. J. Dugdale then showed the improved form of lantern scope he has recently devised for the purpose of viewing lantern slides. By its use the slide under examination is seen with both eyes at the same time, thus enabling the observer to form a more correct judgment as to the qualities of the work. The Secretary showed a telescopic sliding metal tripod, sent by Mr. Pumphrey, of Birmingham. It could be extended to the usual height, or shortened to less than eighteen inches for microscopic work. Mr. Pumphrey then continued his demonstrations of en larging processes. In this instance a very simple apparatus was used—a dark chamber, in an aperture of which the nega tive to be enlarged was placed—in front of that an expanding camera minus the focussing and dark slide, and in front, and movable in three directions, an easel to carry the sensitive paper. A paraffin lamp, placed within the chamber, was used for focussing the enlarged image on the easel, after which it was removed to a tin lantern with a red glass front. A piece of oil ground glass was next placed before the negative to act as a diffuser, the sensitive paper adjusted on the easel, and the exposure made. This was done by means of magnesium ribbon ; a string of ribbon six inches long and held by pliers was ignited at a spirit flame inside the chamber, and passed during combustion from side to side and up and down in front of the ground glass screen, this process being repeated as often as required. To produce a fully impressed enlarged positive I on bromide paper, say from a dense half-plate negative, the enlargement being about three times, lens working at f-1 2, three such pieces of ribbon would be required. If a negative possesses great density in parts, the plan of iliummating offers distinct facilities for adapting the light to suit it. Mr. Pumphrey stated that this method was introduced by Mr. Mankhouse, York, and that it was by his special permission he brought it before the Society. The exposed paper was developed, and the result handed round. An exhibition of lantern transparencies then took place ; the president’s oxyhydrogen lantern was used. First, there was a competition for the best set of slides, the work of the com peting members, and also of the best individual slide. Messrs. Appleby Bristow, Hippisley, Peacock, Wells, and the Rev. E. A. Purvis competed. The judges were Messrs. Dugdale, Perren, Ashman, and Canon Williams, and the points of excellence sought for were four, namely, gradation, colour, composition, definition. Mr. H. G. P. Wells secured the highest number of votes for his series : “The Homestead, Milking Time,” “The Glen, Summer and Winter,” "Saltford Weirs,” and “The Swans, 'Weymouth.” Process: lantern plates, pyro development. For the best individual slide the award was given to Mr. Ernest Peacock, for a view of Uplyme. Process : lantern plate, pyro development. The competing slides were judged first by Mr. Dugdale’s lanternscope, and then as they appeared on the screen. The remainder of the evening was devoted to an exhibition of non-competing slides, contributed by the chairman, Messrs. Bristow, Wells, Powell, Dugdale, Shackell, and others. Annual meeting February 25th, when, after the formal business, Mr. Wells will demonstrate the method of producing lantern transparencies. The Photographic Society of Philadelphia. A stated meeting of the Society was held on Wednesday even ing, January 14th, the president, Mr. John G. Bullock, in the chair. The paper for the evening was read by Mr. Frederic E. Ives, being an abstract of his recent lecture delivered before the Franklin Institute on “Heliochromy, or Photography in the Colours of Nature.” Four permanent colour-print helio chromes by his patented process were shown. He also repeated a suggestion which he made, incidentally, in his lectufeat the Franklin Institute, and which was not published because the lecture was in print when the suggestion was.made. After speaking of the insensitiveness of the old cfforide of silver process, which is suitable only for printing-ou under-qkoured glasses and similar copy, he said he believed a; far betterprint- ing-out process could be devised employing fugitive dyes, which, as is well known, are bleached by the light rays ‘which they absorb. He said : “Suppose we take, for this purpose, three very fugitive dyes—a green-blue, a magenta, nd a yellow. Every part of the spectrum can be represented by means of films more or less deeply stained with these dyes, separate or superimposed upon a white surface ; and if the three fully coloured films are superimposed together, we get a good black. Project the solar spectrum upon this compound film, and what will it do ? Sooner or later, depending upon the light sensitiveness of the dyes, the red rays will bleach the green-blue dye, which is the only one that absorbs those rays, and leave the yellow and magenta unaltered, making a full red. The yellow rays, which are absorbed by the magenta and the green blue dyes, will bleach them both, leaving only the yellow. The green rays, which are absorbed only by the magenta dye, will bleach it, and leave the yellow and green blue dyes unaltered, making a full green. The blue rays, which are absorbed only by the yellow dye, will bleach it, leaving the green-blue and magenta dyes unaltered, making a full blue. Other parts of the spectrum, acting upon the same principle, will give intermediate tints by only partly bleaching t ie dyes by which they are not completely absorbed, and white light will bleach all the dyes, exposing the white support. It might be possible to mix the dyes so as to apply them to gether in a single film, as of collodion or gelatine. Should the light-sensitiveness of the dyes be unequal, evenness of action could be secured by the use of light-filters, as in orthochromatic