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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
- Digitalisat
- 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
- OAI-Identifier
- oai:de:slub-dresden:db:id-1780948042-18910000
- Sammlungen
- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1730, October 30, 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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- The photographic news
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THE CHICAGO EXHIBITION, 1893. The council of the Society for the Encouragement of Arts, Manufactures, and Commerce, have issued a Pros pectus, from which the following are extracts :— Under the date of the 27th August, 1891, Her Majesty was pleased to issue a commission to the Council of the Society of Arts, authorising them to act as commissioners for the Universal Exhibition, which, pursuant to an Act of Congress, and in accordance with a proclamation made by the President of the United States of America, will beheld at Chicago from May 1st to October 30th, 1893. The Royal commission are now prepared to receive applica tions from artists, manufacturers, and others desirous of taking part in the Exhibition, to afford them all necessary informa tion, and to offer them all available facilities which they may desire for this purpose. Such applications must be made upon forms to be obtained from the secretary of the commission at their offices, Society of Arts, John Street, Adelphi, London, W.C. They must be sent in properly filled up not later than February 29th, 1892, and addressed to the secretary as above. As the funds granted by H. M. Government will not suffice to defray all the expenses of the section, it is necessary that they should be supplemented by payment from the exhibitors. A charge will therefore be made to each exhibitor, based on the amount of space occupied, and calculated on the following scale :— ». d. For spaces not exceeding 100 sq. ft 5 0 per tq. ft. „ exceeding lOOsq. ft and not exceeding 200 sq. ft. 4 6 ., „ ., 200 „ „ >. f0> „ 4 0 „ „ 300 „ „ „ 500 „ 3 0 >> » „ 500 „ ,. » 750 » 3 0 „ „ „ 750 „ and upwards 2 6 » The minimum charge will be £5. Exhibitors’ goods will be transmitted direct in bond to Chicago, where the usual Customs examination will be made. Goods for exhibition only will not be liable to duty, but on goods sold the usual rates will have to be paid. Goods can be sold in bond at prices independent of the tariff, the duties being payable by the purchaser. The American railroad companies propose to carry goods back from the Exhibition free, charging the usual rat's for the outgoing journey. These rates, it may be noted, are low in comparison with those usual in European countries. Full information as to routes, traffic, rates, &c., will be provided in due course. A general official catalogue will be published in English, French, German, and Spanish. A special catalogue will also be published for the British section. The general reception of articles at the Exhibition buildings will commence on November 1st, 1892, and no articles will be admitted after April 10th, 1893. Photography is classed, in Group 147, with Instruments of Precision, Experiment, and Research, under Depart ment L—Liberal Arts, Education, Literature, Engineer ing, Public Works, Music, and the Drama. cleaned and ready to receive the same. I have stripped a great many in this way, and have not had a single failure, and in the end requiring no more time than the other processes, owing to the shorter length of exposure necessary as against the use of the prism or mirror. Another point in its favour is, that a number of small negatives may be placed together on one plate, and the printing and etching done in one operation. There are three solutions required, viz.: The rubber solution, which can be purchased ready for use, or made by dissolving a piece of Para or other gum in benzene ; plain collodion, rather thin; and a solution of acetic acid and water 1 to 5. The negative is made in the usual way, preferably on a plate much larger than the copied drawing will be, inten sified with mercury or copper sulphite, and allowed to dry. It is then coated with the rubber solution (draining the surplus back into the bottle), placed on a slab or table, and allowed to dry. It is then coated with the collodion. Now, with a knife, or some sharp instrument, cut through the film, leaving a margin of an inch around the picture. It is then placed in a bath containing the acidified water, where it remains for a few minutes. Another water bath, containing the clean plate which is to receive the film, is now got ready. The plate to be stripped is removed from the acid solution, washed gently under the tap, when, by trying the edges, it will be seen whether the film is ready to strip easily. If not, it must be replaced in the acid. When the edge of the film leaves the plate easily, then lay the plate down, elevate one end of the bath, and, starting at one corner, gradually lift the film from its support until the other corner can be grasped and the film entirely removed. Then place in the dish containing the plate to receive it—face down, of course. Then, by lifting the plate from the water, and with it the film, it will be found to cling to it, and to be quite free from air-bells or particles of dirt. Should the air-bells appear, they can be rubbed out with a piece of soft cotton or a squeegee, interposing a piece of clean absorbent paper. As before stated, negatives made in this way are absolutely sharp, whereas, when made through the glass, the thickness of the same has to be guessed at, and the camera focussed back this distance—a rather crude method where absolute sharpness of lines is a sine qua non.— Wilson's Photographic Magazine. patent ntellgence• Specially compiled for the PKOTOGRAPHIC News by Herbert & Co. (H. J. 4 K. Haddon), Reg shred Patent Agents, §e., of 18, Buckingham Street, Strand, London, W.C. REVERSED NEGATIVES BY STRIPPING. BY A. H. CALDERWOOD. SINCE the introduction of photography into the making of plates for the type-press, and thus the necessity of reversed negatives, much has been written on how best to secure these. Some advocate the use of a prism before the lens to be the. only way; others hold a mirror to be equally efficient; while some say they can be made by placing the glass side of the sensitive plate nearest the lens, and so I receiving the image through the glass. Each have their drawbacks, one being expensive, the other troublesome to keep in order, and the third uncertain. I am using the method of stripping the films from the one plate, and reversing or turning them on another, Specifications Published. 18,120. Nov. 11th, 1890.—“ Lantern Microscopes.” R. G, Mason, 24, Clapham Park Road, Clapham, S.W. At the under side of the stage plate are fixed, by screws or other means, two dovetail pieces of brass or other metal to form guides. Two dovetail plates are arranged to fit firmly into said guides, one of said plates having fixed to it the tube containing the optical system of lenses, for use with the magic lantern or projective form of instrument ; the other plate has fixed to it the half of an ordinary joint used to incline micro scopes at any angle. A stop on the main plate prevents the plates from sliding right through, so that the two dovetailed plates are exactly central to the optical axis of the instrument when pushed in under the stage plate. The plate carrying the system of lenses has a screw at the end of the outer tube for screwing into the front of a magic lantern. On the upper side of the stage plate is fixed a limb carrying
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