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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
- 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-id1780948042-188300004
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- http://digital.slub-dresden.de/id1780948042-18830000
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- oai:de:slub-dresden:db:id-1780948042-18830000
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- Bandzählung
- No. 1300, August 3, 1883
- Digitalisat
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Zeitschrift
The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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- The photographic news
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Avgust 3, 1883.] THE PHOTOGRAPHIC NEWS. 483 2} ounces grains 1 20 ounces j to be made. so in our ounces 2} 20 11 11 5 6 120 5 5 5 ounces 20 grains 1 grain 5 ounces Pure alcohol, absolute ... Methylated ether Pyroxyline Iodide cf cadmium Iodide of ammonium Bromide of ammonium... formula for a bromo-iodized collodion for this pur pose :— suitable agent. Make a solution of Bichloride of platinum Water way of working for making slides. Developer.— Ammonia sulphate of iron, crystals. Water Methylated spirit Aceto-gelatine The aceto-gelatine is made thus :— Glacial acetic acid Gelatine ... Nitrate of silver (preferably fused) 40 grains Distilled water 1 ounce When well washed, after the fixing, immerse the plate for a few seconds in this; it will be seen to tone rapidly— this may be done in daylight—taking care not to overtone. When the tone required is about to come, stop it, wash thoroughly, set up to drain and dry, and when quite dry, varnish the transparency with crystal varnish by heat. cals will not give a robust image under the iron developer, then it will be necessary to resort to this method of intensifying the developed image ; but we should prefer to avoid it if possible, because of introducing a complication of the process. Fixing is best performed with weak cyanide in pre ference to hypo. After fixing, we can still better judge of the quality of the image ; but it is rarely that the resulting tone is such as to please, if even the density and other qualities are correct; therefore, to obtain the tone desirable for a lantern slide, we find platinum the most It is advisable to make a large quantity of this iron developing solution ; it improves by age, and is better when red than when freshly made. The function of the aceto-gelatine is to give density and tone to the developed itnage. The glasses being albumenized, the collodion filtered, the bath in good order, and the developing solution all ready, we will begin. Coat a plate carefully with collodion, taking great care to avoid crapy lines ; allow to set tho roughly, immerse in bath, and leave until a nice creamy film is formed. Raise the plate on the dipper, and allow to drain, wiping the back of plate free from superfluous bath solution. Expose in camera, say thirty seconds (time will vary with lens used, class of negative, the light, and the state of collodion and bath); return to the dark room, and develop in wet plate fashion. Now comes the critical moment 1 Let us watch the image coming up. True, we can use a pale yellow light, so different from the sombre red needful when we work rapid gelatine plates. Under this aceto-gelatine iron developer the image should appear directly; we see it grow in the familiar wet plate style, which makes us sigh for the like condition of things when using gelatine plates. The image should be a warm brown against the pure unchanged portions of the film which are meant to remain clear; we must watch very attentively now, for the slightest indication of veil is the signal to throw off the developer, and place the plate under the tap. A little experience will soon render this branch of the process easy. What is required is to be able to judge how far to carry development, and this will depend largely on the condition of the chemicals. After arresting the development, some persons re-develop with pyro, and acid silver before fixing. This is a matter in which the mani pulator must be guided by circumstances. If the chemi- THE TOURIST PHOTOGRAPHER. Over the STELVIO Pass.—II. Standing on the smooth carriage road in a defile that might be mistaken for a huge railway cutting, you are a thousand feet above the line of perpetual snow. There is no view here, at the top of the pass, but it is only necessary to climb one of the eminences near at hand to enjoy a magnificent sight—far-stretching snow fields and pinnacles of ice on the one hand, and sugar-loaf mountain peaks on the other. But we must not tarry long, for there is still a long stretch before us to our resting place. It goes steeply down hill on the Austrian side, the road making as many as fifty zigzags before the little hamlet of Trafoi is reached Let it be slightly acid to test-paper by nitric or acetic acid, and filtered. When freshly made, the bath should have a It is best to make the plain collodion first, decanting the clear portion, and filtering repeatedly after iodizing. The maturation of a collodion such as this is a matter depend ing much upon the quality of the cotton used—some cottons will give a collodion with this formula which would be colourless months after compounding. In such cases, and indeed in almost any case, it will be best to add free iodine by dropping in about five minims of tincture of iodine per ounce of collodion ; this will tint it straw colour, which will soon change to red. A red collodion is slower than a pale one, but will give clear glass in the shadows, with greater freedom from fog, scum, or deposit under the developer. Bath.— for night quarters. The way, too, is not so satisfactory as on the Italian side ; instead of a hard well-made thorough fare, the road is loose and rotten, the shaley fragments of which it consists being torn from the sides every year by the melting snow ; but this soon alters for the better as soon as you have descended a couple of thousand feet, and enter the black pine-woods that break upon your view. If you turn round now, you get a charming glimpse of the whole Ortler Chain, the highest range in the Tyrol. With the lofty black pines as a foreground, the snowy whiteness of the Ortler Spitz stands out very vividly, and by careful development afterwards—for we need not say how difficult is the problem of bringing out detail in the black masses of shadow underneath the pines, and at the same time preserving the delicate outline of the snow mountains—a most telling photograph of the scene may be secured. [N.B.—The raising of the camera front is a sine qua non if full effect is to be given to the height of the mountain peaks.] Just above Trafoi, and at the very base of the Ortler Spitz, is a green patch known as the Biirenboden, or Bear Garden, where Master Bruin, it is said, may frequently be seen. We saw none on the occasion of our visit; but that there are bears in the Tyrol we can testify from actual experience, for we remember not many years ago seeing the body of a tremendous fellow within twenty-four hours of his being shot. The ragged yellow teeth we still recollect vividly, for he was an animal some ten or twelve years old, having been killed by a Chamois hunter, near the village of Pfunds, not far from the Oetzthal Glacier. But the Biirenboden is the subject of a good photograph, in any case, the little pastoral scene surrounded by wild rocks and lofty precipices, to say nothing of the grand Madatsch glacier, whose glacial billows come down the mountain side close by. . . At Trafoi the hotel is not very good; but, as it is the best hereabouts, one must perforce be satisfied. Here it collodionized plate put in and left in all night; this is better than iodizing the bath—at least, proves - i- —
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