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The photographic news
- Bandzählung
- 24.1880
- Erscheinungsdatum
- 1880
- Sprache
- 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. 1152, October 1, 1880
- Digitalisat
- SLUB Dresden
- Strukturtyp
- Ausgabe
- Parlamentsperiode
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- Wahlperiode
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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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October 1, 1880.] THE PHOTOGRAPHIC NEWS. 473 which showed its contents, and a reference to my field-book enabled me to judge which box to open in order to fill my slides with any particular kind of plate. Now as to the field-book. The one I used was designed by Mr. Paget, and presented to me by him ; it is not perfect, however, as I will show. The following is the design, and a couple of extracts from my notes : 3/9/80 3/9/80 S 3 24 17 RR I 42 18/WA w 3 3 2 Subject. 8 j Remarks. Dent Blanche from 5,9/ j Light G. Irnli. i I Time 2.30. Rather OE. Grner Glacier from 5/9/ | Light M. Hornli. I Tima 3.35. I Right exp. It will be seen that two more columns arc required; one Whether a plate is developed or not, it is easy to track it when repacked. The second line shows what kind of in formation was given in the field-book when an excursion was made. Now 42 was a batch of slow plates, required about a quarter of the exposure of a wet plate ; the num ber of the plate was 18, and found to be in slide No. 4, a fact noted when the slides were filled, the other two numbers being entered before the tour commenced, in order to save trouble. When a plate had been exposed, a faint pencil line was run across the number indicating the slide, showing it had to be refilled, and preventing any small confusion which might otherwise have arisen. Ollier Kit Required.—The next article required is some thing wherewith to light the room in the evenings to enable one to change plates. In one of my works 1 have described a screen made of cardboard, to be used with a candle; and it is this I should employ again, taking, how ever, as well, a small sheet of tin to place over the top, in order to prevent the light being reflected from the ceiling. Any small hole is of no consequence, so long as the beam of light does not fall directly on the plate. It requires the light of a naked candle four feet off to act for ten seconds to give a transparency, and it will be manifest that any small beam of light, when reflected (say) ten feet off the plate, and thus diffused, would be inoperative to fog a plate, except with the most prolonged exposure (say an hour) to it. A dusting Lrush is an absolute essential. Plates, however carefully packed, and if left in the slides, invariably have dust upon them ; and this can only be avoided by using the brush freely on the night previous to making an excursion. The screen was covered at first with Thomas’s ruby paper, and subsequently with orange paper. I found both an ample protection to plates prepared with iodide, and I cannot say that I have found them less advantageous with the commercial plates I took with me, notwithstanding that, owing to the smallness of the packing boxes, the exposure to the light was more prolonged than with my own plates. I took one dry plate box to hold twenty-four plates with me, but this I should leave behind on another occasion, since, with a few spare framesand one spare card box, it is unnecessary. Kit for Developing.—I took a small chemical chest with me, about 18 inches long by 1 foot wide and deep. This I should not take again ; all I should take would bo :— G oz. bottle of concentrated pyrogallic acid Edward’s 6 0z, >» „ ammonia and bromide) developer 2 lb. of alum 1 lb. of hyposulphite 2 oz. of a 20-grain solution of potassium bromide 2 oz. of a 25 per cent, solution of ammonia 2 oz. of glycerine (useful for sun burns) 1 oz. of pyrogallic 1 oz. measure 1 drachm measure 6 trays Small ball of string A sponge A duster Gummed paper. All the above may be packed in a very small box, and lb: of ferrous sulphate and 1 lb. of neutral potassium oxalate may be taken in addition. A box 10 inches long, 7 inches wide, and 7 deep will hold all of these. Now all the fore going, camera included, can be packed in a small basket about 18 inches long by a foot wide and 15 inches deep. And it will be found that no damage of any kind will happen to either plates or bottles, so long as they are fairly tightly packed ; neither this year nor two years ago had I a single thing in the basket broken. The wicker acts as a spring when porters fling the baggage about, as is always the case. My strong advice is always to pack your photo graphic kit in a basket. This basket dodge belongs to Mr. England— at least, he first pointed out its advantages, and he invariably adopts it. One more thing I forgot, and that is, a 2-foot square of india-rubber sheeting. This is useful during development to save messes on the table, and is utilized in packing to wrap round the boxes of plates to prevent any rain penetrating to them during transit. As regards the trays mentioned, they take up very little room, and the question comes what kind of trays to take. During my last tour, Mr. Darwin and myself left some ebonite trays to drain on the window-sill, and being for gotten in the morning, by the evening they were nearly as flat as pancakes, through the sun having shone on them during our absence. This prevented some of my friend’s pictures from being developed, as he was using larger sized plates than mine ; but luckily I had a couple of papier mache trays with me, which I then put in requisition. Ebonite are the nicer of the two, since the alkaline solutions dissolve the varnish of the papier mache ; but I believe tin trays lined with india-rubber sheeting, as adopted by Mr. England, would be better than anything else. Failing these, I should again take out ebonite, but should be careful about the sun. The gummed paper is useful for labelling nega tives, and for a variety of purposes (I mended too badly- broken pipes with it most effectually, and thus was able to smoke in comfort till my return home), and should be al ways taken. If the card frames get damaged, it is at hand for repairs. (To be continued.') THE POLIMERISATION OF VINYL BROMIDE IN THE LIGHT. M. D. Loor has examined the influence of different sol vents, and of iodine, water and carbon dioxide, on the poli- merisation of vinyl bromide (0 2 H 3 Br) in the presence of light (so-called “photo-polimerisation"). Water, air, and carbonic acid do not interfere with the action of light. Sul phurous acid accelerates it very much. A slight addition of iodine colours vinyl bromide, free from alcohol, rose violet, and stops the polimerisation until the colouration has dis appeared through the influence of light; then the liquid darkens in consequence of the separation of the polimer. If a slight excess of iodine is taken, then the liquid is not altered in the light, and remains clear. The iodides of methyl and ethyl prevent the action of the light, in conse quence of their own decomposition—viz., the separation of iodine in the light—and the dissolved vinyl bromide re mains uninfluenced by isolation for a long time. Aniline also prevents decomposition in the light, but is itself affected, as it turns reddish brown.
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