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

March 20, 1891.] THE PHOTOGRAPHIC NEWS. 235 estimate. For comparison, there were shown on the screen photographs of the Orion nebula and the great nebula of Andromeda, and reproductions of the best drawings available prior to the production of these photographs. In dealing with stellar photography, Mr. Maunder paid a well-merited tribute to Dr, Gill, of the Royal Observatory at Cape Town, whose photographic survey of the southern hemisphere—carried out largely at his own cost, and now practically completed—may be fairly said to have originated the scheme for the general photographic survey of the heavens determined upon by the International Congress, and the arrangements for which are now in an advanced stage. In treating of these matters, Mr. Maunder spoke at length on the admirable work done by Messrs. Paul and Prosper Henry, of the Paris Observatory ; his remarks were illustrated by a large number of lantern slides showing the instruments used, photographs of the Pleiades, a portion of the constellation Cygnus, &c. In conclusion, Mr. Maunder dealt with the application of photography to solar and stellar spectroscopic research, and he exhibited on the screen the wonderful photographs obtained by Mr. Higgs from the red end of the solar spectrum, and examples of the spectra obtained by Professor Pickering from stars the duplicity of which had been revealed by the spectroscope, the spectra obtained on some days showing the duplication of the lines due to move ments of the stars in the direction of the line of sight. This duplication of the lines showed that the spectrum in which it occurred was compounded of the light from two stars moving at different velocities with regard to the line of sight, and, by collating the observations at different dates, it was possible to calculate the periods of revolution and the masses of two stars which had never been separated visually by any telescope yet made, and, probably, never would be. At the next meeting of the Lantern Society on March 23rd, the slides sent to England by the American Lantern Slide Interchange will be exhibited. The West London Photographic Society. March 13th.—Mr. W. A. Brown in the chair. The President announced the result of the meeting called by Mr. Biden on the subject of federation, and said that he considered the smaller societies would be greatly influenced by the acti m of the Parent Society in the matter. The council had, however, resolved to send two delegates to attend the next meeting on the 23rd inst. Mr. Roland Whiting then read a paper on “ The Laws of Art as Applied to Photography,” which he illustrated with sketches on the blackboard. A long discussion ensued, principally on the subject of improving or otherwise the composition of photographic pictures by combination printing. The Leicester and Leicestershire Photographic Society. March 11th.—Mr. J. Porritt in the chair. One new mem ber was elected. A communication was read by the Hon. Secretary from the Midland Railway Company, in response to an application from this Society for reduced fares for members when travelling on photographic excursions, to the effect that, having considered the question, the management do not see their way to grant the request. It was resolved : “ That this Society places itself in communication with the secretaries of various neighbouring societies, with a view of forming an association for obtaining facilities in this direction.” Mr. George Bankart then gave a demonstration on “ Auto type or Carbon Printing.” He prefaced the demonstration with a short description of the principles of the process, and the various results from different conditions of exposure and heat in development, and then proceeded to develop two 11 by 9 pictures printed on the Autotype Company’s tissue ; and the various stages of development, from squeegeeing on to opal, to the finishing of the process by development of the picture by hot water, were watched by many to whom the process was entiiely novel. The demonstration was good, and yielded artistic pictures. It was announced that at the April meeting Mr. Porritt would read a paper on “ Photography, Past and Present,” with notes on the quality of dry plates and lantern slides, and a few remarks on the object of our discussions. The Putney Amateur Photographic Society. March 11th.—Mr. G. Davison gave a lecture on “The Art Side of Photography.” After a few brief remarks on the relation of art to photography, he divided his lecture into the following sections : —Tone, balance of lines and focus, illustrating his remarks under each heading by handing round for inspection numerous prints, all of which were thoroughly appreciated. The printing-in of clouds, the trimming of prints, and the mounting and framing in the most effective manner, received his attention, as did the effect of an addition of mercuric chloride to the platinotype bath, the use of lenses and stops, and finally, pinhole photography. At the close of his lecture, a discussion on the subject took place. The Derby Photographic Society. The monthly meeting was held at Smith’s Retaurant, Victoria Street, on Tuesday ; Mr. Richard Keene presided. After the business was transacted, Mr. J. A. Cope, of the Derby Society, gave his paper on “The Chemistry of Photo graphy.” He explained the composition of a photographic dry plate and the action of light upon the same, together with all the chemical reactions which take place during development. He then touched slightly upon the different printing processes now mostly used in the practice of photography. A large number of negatives made by members of the Society was handed round for examination and discussion. The Secretary distributed several samples of the Barnet plate, sent by Messrs. Elliott and Sons. Six new members were elected. A number of the members of this Society journeyed to Leicester on Thursday evening to a conversazione under the auspices of the Leicester Photographic Society, on the invita tion of the vice-president, Mr, F. Pierpoint, who gave a lantern exhibition. At the close of the conversazione the Derby Society were entertained by the vice-president. The Hackney Photographic Society. The ordinary meeting was held last Thursday, when Mr. Roland Smith presided. A paper, with demonstration, on “ Bromide Enlarging ” was read by Mr. S. H. Fry. He prefaced his demonstration by explaining the best kind of lens to use, and the diaphragm, advising the use of as large an aperture as would be consistent with sharpness and atmospheric effect. For vignetting he made a hole in a card, and obtained the vignetting effect by a rotary motion. If one part was not properly exposed, it could be treated locally or re-exposed (by washing off the developer, and bearing in mind that the paper was only about one-third as sensitive as it was before). As a good way to gauge expo sure, when in doubt, say, for a matter up to three minutes, he advocated the placing of a strip of paper across the exposure board, and giving a number of exposures right across, taking a record ; then after development the correct exposure could be decided on. The lecturer advised the use of plenty of safe orange light, and when judging the density it could best be done by looking through the paper. With respect to developers, he preferred the ferrous oxalate at present, though eikonogen may eventually usurp the place. The lecturer said he had found the acid baths unnecessary, provided the developer was perfectly washed out of the paper, and, moreover, if acid was conveyed to the fixing bath, there was danger of a formation of deposit of sulphur. He advised the soaking of the paper prior to development in distilled water. Mr. Gosling asked whether ordinary water would not do, but was informed that there would be oxalate of lime formed.