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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
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- SLUB Dresden
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- Public Domain Mark 1.0
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- urn:nbn:de:bsz:14-db-id1780948042-189100009
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- http://digital.slub-dresden.de/id1780948042-18910000
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- oai:de:slub-dresden:db:id-1780948042-18910000
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- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1693, February 13, 1891
- Digitalisat
- SLUB Dresden
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Zeitschrift
The photographic news
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Band 35.1891
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Band
Band 35.1891
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- Titel
- The photographic news
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February 13, 1891.] THE PHOTOGRAPHIC NEWS. 133 Photographic Exhibits. At the close of the foregoing lecture, the following objects of interest were on view in the library:— Pinhole pictures of the cedars at Terling Place—Lord Ray leigh, M.R.I.; thaumatrope showing formation of water drops —photographs of water drops and of sparks—Professor C. V. Boys, M.R.I.; apparatus used by the French Explosives Com mittee—Sir Frederick Abel, M.R.I.; photomicrographs of Greek gems and coins—Mr. Wilfrid Godden ; photographs of waterlilies—Mr. GrevilleH. Palmer ; photographic application of primuline—Messrs. Green, Cross, and Bevan ; stereoscopic lantern and camera combined—camera for taking pictures from three to ten a second—direct reading photometer—photo graphs of clouds—Mr. Friese Greene and Mr. Varley ; photo graphs of animals—Mr. Gambier Bolton ; collodion pigeon dispatches—Mr. W. B. Tegetmeier ; photograph of a view in winter from Piz Lingard—pigeon post dispatches—Mr. J. Spiller ; photographs of moon and eclipse—Mr. F. S. Wells ; monochrome portraits of residents in Aden—Mr. C. A. Long; new camera with aluminium fittings—Mr. J. R. Gotz ; photo graphs from isoehromatic plates—new camera and developing dishes—Messrs. Griffin & Son ; specimens of typographic etch ing—Typographic Etching Company ; Mr. F. Galton’s reaction of time chronoscope—Mr. W. Groves ; terpuescope lantern— Mr. A. Wrench. M. DAGROX and the French Pigeon Post. The illustrations of the French pigeon post, 1870-1871, which were shown in the library of the Royal Institution by Mr. J. Spiller on Friday evening last, are an interest ing memento of M. Dagron's unique services in establish ing communication between Tours and Paris during the siege and investment of the last-named city. On the 10th of November, 1870, two balloons, appropriately named “Niepce and “ Daguerre,” ascended from Paris, and one of these was immediately captured by the Prussians; but the other, the “Niepce,” carrying M. Dagron and a complete set of photographic apparatus, made a successful journey south, and succeeded in eluding the vigilance of the enemy until the outfit had been safely packed and transferred by its owner to Tours. Here postal messages were received, from first to last, to the number of about 50,000 ; they were despatched regularly every day to Paris by carrier-pigeons in the following manner : The words of the telegrams and written messages were first set up in common type, and printed in columns so as to form one large sheet; this was then copied by camera and collodion on to a little plate not exceeding 14X24 inches, and from such negative a score or more transparencies in toughened collodion were produced, so as to provide for the failure or loss of the greater number of them. The collodion films were then stripped off their glasses and rolled up into separate parcels for insertion into a quill holder to be carried by the bird, whose ordinary load was a gramme, or twenty pellicles, attached to the feathers of his tail. A pigeon service was established, and the trained birds regularly sent out of Paris by balloon ; these returning home again—or a fair proportion of them—carried the news into the beleaguered city. On arrival, the micro scopic films were detached and flattened out between two glasses, and either publicly exhibited by the electric lantern, or copied direct by photography on a legible scale, and ultimately distributed to the persons to whom they were addressed. This system of intercommunication remained in force until the withdrawal of the German troops, in 1871, permitted the resumption of the ordinary postal service. In England press messages are usually tied to the legs of earner pigeons. patent IEntellgence. Specifications Published. 15,091. September 26th, 1890.— “Preparation of Chemicals adapted to the Development of Photographic Plates.” Abel M'DoxaLD, 1, Lawn Terrace, Silloth, Cumberland, Photo graphic Engineer. In the preparation of developers for photographic plates and the like it is necessary to possess a number of different chemicals, both in crystals and solution, such as liquid ammonia, nitric acid, &c., which are more or less injurious to the health ; this necessitates the manipulator to have in possession a number of bottles of solution, from which an accurate portion must be mixed at the time of developing; by the aid of weights and measures, this causes loss of time, risk of breakage, and encumbrance when on a tour. To dispense with the aforesaid disadvantages, I purpose manu facturing a combination of chemicals into one body pos sessing the essential properties of; a first-class developer. This I accomplish with the following chemicals, and in the following manner : I fuse together one part of sodium oxide, three parts of sodium carbonate, and six parts of sodium sulphite, or in other proportion that may from time to time be necessary. I then form the compound into tablets or sticks of a convenient size and weight ready for dissolving in a given quantity of water without the aid of weights or measures. The advantages of my invention are :— 1st. Being a combination of chemicals in one solid body the photographer does not require to have in stock a number of different chemicals. 2nd. Being of a convenient size and weight it can be readily mixed at the time of use without the aid of weights and measures by any inexperienced person. 3rd. It entirely dispenses with the burdensome practice of carrying developing solution in bottles, as it is used with the dry pyrogallic acid alone, thus the entire chemicals necessary for developing are light, and can be kept in a small compass. 18,369. November lith, 1890.—“Shutters for Optical Lan ¬ terns.” George Samuel Thompson, 5, Road, Stoke Newington, Middlesex, Carriage Builder. What I claim is :— 1. The plan and arrangement of sliding diaphragms, for magic and other optical lanterns, or combinations of lanterns, having two or more optical systems, whereby rolling up effects and rolling down effects may each be produced twice in succession. 2. The arrangement for a triple lantern whereby the effect of a curtain rolling up or down may be made, cutting off the light from two optical systems, appearing from one, and vice versa. 3. The arrangement whereby, after the production of either one or two rolling up effects, from a combination of two or more optical systems, every optical system can be opened free for dissolving purposes without removing the shutter from the lantern or causing a rolling down effect. 4. The arrangement with lanterns of two or more optical systems, whereby after all optical systems have been open for dissolving purposes, one or two rolling down effects can be pro duced without having either to insert the shutter in the lantern, or produce a rolling up effect. To Prepare Glue which will remain Liquid.—A certain quantity of finely ground glue of best quality is soaked in a sufficient quantity of alcohol ; there must be enough of the latter to always cover the glue. Let the mixture stand for twenty-four hours, and stir from time to time. If the glue does not dissolve entirely, add more alcohol until the desired result is reached. Then pour the liquid glue into a bottle with a wide neck, and keep it well corked. The glue may net be as strong as if it had been boiled, but it will remain liquid, and retain the full force of its adhesiveness.—The Lithographic Art Journal,
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