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The photographic news
- Bandzählung
- 24.1880
- Erscheinungsdatum
- 1880
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- Englisch
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- F 135
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1147, August 27, 1880
- Digitalisat
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Zeitschrift
The photographic news
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Band
Band 24.1880
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- Register Index 631
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Band
Band 24.1880
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- Titel
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August 27, 1880.] THE PHOTOGRAPHIC NEWS. 419 the camera, and hence a movement. If the camera be very weighty in comparison with the shutter, of course the movement will be barely perceptible ; or if the shutter drops or moves in the camera near the centre of gravity of the latter, the motion will bo very small, but still it exists. After some thought regarding the matter, I came to the conclusion that a shutter, to bo perfect, should not be in rigid connection with the camera, but separated from it, though it may be connected with it by a flexible material, so long as it is not supported by it. To carry out my idea, I bad a shutter made, which originally was intended to fit on to the end of the lens, and which I adapted to my purpose. The form, as will be seen, is a drop shutter, the aperture of which can be shortened by a sliding piece of ebonite. The opening for fixing on the lens is shown by the dotted circle C. The total opening that can be given to the drop is six inches. Atone side is a pin to which is secured a loop of elastic, E, which, when the shutter is ready for action, can be caught up by a pin, P. When the trigger, T, is withdrawn, the elastic causes the aperture to pass rapidly over the circle C. By adopting this plan the full aperture of the lens is used during nearly the whole time of exposure, hence there is more light than when the length of opening is shorter, and where it drops by its own weight. This shutter can, how ever, bo used to drop by its own weight by making the length of opening only four inches ; it then begins to [all two inches above C, and the total length of exposure >s then the same as if the drop commenced just above the opening of the lens with an aperture of two inches. By this plan, though the time of exposure is the same as in the last case, the total light admitted is increased by at least one-half, which is an important point. The shutter when tried, when fixed on the lens, however, showed movement during expo sure. To remedy this, round the circular opening of the drop shutter, and outside the flange, a conical bag of velveteen was fastened, an elastic band running round its other extremity. This bag was then carried over the lens, leaving the circular aperture of the shutter near the lens, but not in contact with it. To focus, the shutter is placed on the lens, and when exposure is to be made it is drawn off it, and held in one hand, the other hand being free to release the trigger. With this arrangement there is not, nor can there he, the least trace of shake in the resulting picture, and the inconvenience of the detachment is very small. The original shutter was an adaptation of Wratten and Wainwright’s plan, which that firm carried out for me. PLAIN PAPER PRINTING. BY CAPT. F. W. TURTON, R.N. In these days, when we hear so much about Art, and when etching and the lovely art of mezzotint engraving is being revived, why should photographers be so much in the rear ? Photography cando so very much, when artistically directed in black-and-white ; as in opal work it may (without the aid of any colour) make pictures to look exactly like neu tral tint drawings, and in well arranged prints on plain paper rival fine mezzotint engravings. The fine tones of the platinotype prints are quite in the right direction ; but the difficulty is at present to get the makers of ordinary sensitized paper to sensitize carefully some of their paper on the plain side—not the albumen side. I have made several trials of sensitized paper printing on the plain side, but unless the paper is sensitized on that side I find that it is very slow in printing, and does not stand out well. Mr. Werge sensitized me a sheet on the plain side, which printed much quicker and better, and did not sink in so much when finished. It would seem that if payer makers had some of these papers sensitized on the plain side, they would get a market for it among those photographers who desire to produce some rival work to fine mezzotint engravings. The Photographic Co-operative Association are now sensitizing me some paper with this object, and I hope it may be successful. As regards opal work, a year ago I showed a little opal head of mine that had been exhibited at the Photographic Society to a French artist, who said: " That is a little neutral tint drawing.” He was much suprised when I told him it was a photograph on opal toned with gold. Goxxespondence. APPARATUS FOR THE MILLION. Dear Sir,—I for one shall be glad to see the “ further particulars ” offered by Mr. H. Stone on page 407, if he will favour us with them, and you will kindly insert.—Yours truly, RICHAED Parr. HYPOSULPHITE WASHINGS. Sir,—It may interest your readers to know that I am using zinc plates to precipitate the silver in my hyposul phite washings. I used some time ago to throw them away, because they smelt so, but I now geta lot of residue out of them. I prefer zinc to liver of sulphur. I put two big zinc plates at the bottom of my tub, into which I pour the washings. Every week I collect the precipitate. If you think this worth while publishing, you may do so. How can I use my precipitate best—can you tell me ? A Vexed Printer. [Our correspondent has scarcely discovered anything new ; neither, do we think, is he strictly correct in believ ing that zinc plates are preferable to liver of sulphur, which is generally employed by photographers. The liver of sulphur would probably abstract more silver from his baths, and do so more readily; however, we will try the experi ment. We should recommend him to get rid of his preci pitate to a refiner ; it hardly pays a photographer to work it back into nitrate.—Ed. P. N.J PHOTOGRAPHY BY GASLIGHT. Sin,—My attention has been called to an error which has crept into your article on “ Photography by Gas light,” in your issue of the 9th inst., respecting a model gas enricihng apparatus, and the London Argand burner, by Messrs. Sugg and Clarke, the well-known patentees. I think it right to inform your readers that the patent Mr. Clarke and I took out for the gas enriching apparatus was
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