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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
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- Englisch
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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. 1307, September 21, 1883
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The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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606 THE PHOTOGRAPHIC NEWS. [SEPTEMBER 21, 1883. more than three, then of any number of dimensions? “ I need hardly say,” says the Professor, with a touch of un conscious irony, “that the first step is the difficulty, and that granting a fourth dimension, we may assume as many more dimensions as we please,” “The achievements of Euclid, Archimedes, and Appolo- nius are as admirable now as they were in their own days. Descartes’ method of co-ordinates is a possession for ever. Never in the history of the world, however, have mathe matics been more assiduously or more successfully cultivated than in the Victorian age.” B Hictionury of Dqotogragkt. ALBUMENIZED PAPER (Printing on).—Continued. Mr. W. E. Debenham has found that sensitized paper may b e preserved for a longtime in a satisfactory condition, if it has been sensitized upon a nitrate bath to which a small proportion of per chloric acid has been added. In ordinary cases, some six or ten drops to each ounce answers well. Only yellow light should be admitted into the printing apartment when the sensitive paper is uncovered, because the delicate whites of the print will not be found to suffer in the slightest degree by the continued action of even a bright yellow light. The accompanying sketch, A, indicates what is called the A. printing or pressure frame, such as usually employed for nega tives up to 6} by 4} inches (half-plate); attached is a label or tablet, as shown, with the number of prints required, and one stroke is inscribed each time the frame is re-charged, thus forming a convenient mode of registering the number of prints executed. Perhaps a better plan may suggest itself to many, such as attaching a label permanently to the negative, narrow strips of albumenized paper being well suited for the purpose. The sketch, B, shows a frame which is provided with a plate-glass bed B whereon the negative is laid, so that any smaller sized negative than the plate-glass may be printed in it. As a rule, however, these frames are employed for the larger sizes only. When the frame is open, light is free to pass through; but when closed, as in the sketch, light can only pass through the negative on to the sensitive paper. The back is made in two halves hinged together, so that the pressure may be retained on one-half, while the other half may be opened to examine the progress of printing. Very little danger of altering the position of the print exists if only ordinary care be exercised, and sufficient pressure be retained on the other half. We will suppose we are working with a quarter-plate negative in a quarter-plate frame, size 44 by 34 (glass beds are seldom fitted to this size) ; the negative must lie quite flat in the rabbet; if it does not do so, either the rabbet is not true, or the negative is not flat. If the frame is at fault, and cannot be easily corrected, it will be wise economy to discard it, or a number of valuable negatives may be broken in consequence ; but if the negative is not flat, which may be seen by looking along the edge, we must gum one or two narrow strips of paper on the portion that does not touch the rabbet; if the negative no longer rocks in the frame when pressed at each end, it may be considered safe to apply the pressure. Place the negative down on the rabbet of the printing-frame, varnished side being uppermost; pass a camel-hair brush once or twice over the surface to remove any adhering particles of dust; then place one of the pieces of paper cut to size down on the negative, albumenized side in contact with the varnished surface of the negative; upon this lay evenly one or more thicknesses of blotting-paper, each piece as large, or larger, than the piece of sensitive paper ; this forms a padding to increase and equalise the pressure (a better article for the purpose is the red sheet rubber, which does not affect the print, nor cause dust, like paper, felt, and padding, of that description; it is manufactured any size and thickness); place the back of the frame in its proper position, and close the springs. If the negative can be moved about easily after the springs are closed, the pressure is insufficient, and more padding must be added. Blurring in the print is a proof that negative and paper have not been pressed into contact. Let the printing board or bench be erected out in the open air, as far away from the surrounding buildings as found convenient: con struct it with a sufficient angle for rain to run off sharply, and let it face due north. Photographs may be printed in direct sunlight; but any imperfections in or on the glass, such as blisters, scratches, &c., will be faithfully reproduced, unless the sunlight be filtered through a semi-opaque substance, such as tissue paper or ground glass. Moreover, many varnishes will not stand the heat pro duced—they become tacky ; on the whole, it is better not to use direct sunlight, especially as nearly as much work can be produced by having a good expanse of north light. When it is desired to print in wet weather, the frames should be exposed to light under glass. Printing takes place much slower than as previously described ; we will assume the weather osench for printing to be fine. (To be continued} -o Uorxespondente. THE PHOTOGRAPHIC CONVERSAZIONE. Sir,—In your issue of 8th June there appeared a letter suggesting that some attempt should be made to enliven the too overpoweringly dreary nature of our annual con versazione. I do hope that some leading member of the Society—if the Council as a body will not condescend to move—will take the initiative in the matter. A few dances, or even a little music alone—and the available talent among our fair guests must be more than sufficient for either purpose—will render the meeting a success, and cause it to be more agreeably remembered than former ones have been. Quieta non movers is a very good rule, but when quiet degenerates into unutterable dulness, any change is for the better.—Your obedient servant, A. T. [P.S.—There was at one time, I believe, a rumpus about tail-coats. I always feel inclined to be sulky when I am obliged to don my own tail-coat: but ours is, 1 believe, the only Society of any pretensions where gentlemen are to be seen on such an occasion dressed in the “ go-as-you- please ” style.] PHOTOGRAPHY AND TRICYCLING. DEAR Sir,—“ Only an Amateur” writes as if it were but amateurs who are interested in tricycles; but if, as some of your correspondents make out, as much as fifteen or twenty pounds could be carried without difficulty, I think a machine would suit me for country work. My only fear is that I should not be able to work the thing without dis comfort, and this, after spending fifteen or twenty pounds,
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