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The photographic news
- Bandzählung
- 29.1885
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- 1885
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1390, April 24, 1885
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Zeitschrift
The photographic news
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Band
Band 29.1885
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- Register Index III
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Band 29.1885
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April 24, 1885.j THE PHOTOGRAPHIC NEWS. 263 “ They needn’t be great globes. A little water makes a lot of steam, doesn’t it ?" “ But what about the rapid motion of the tail as the comet sweeps round the sun, and how do you account for the “Look here! I’m just going to ask you a question before yo go on. If the tail isn’t steam blowing out of something, what is it now, eh?” 1 confessed that I did not know. “ That’s just what I thought! You haven’t got a theory! None of you have got a theory! Now I have, and when you fellows have got a better one, then it will be quite time enough for you to pooh-pooh mine!" and he walked away triumphantly. On the 5th of February we passed the far-famed Peak of Teneriffe, and had the satisfaction of seeing it free from cloud, although there was a fair amount of haze about. I took a shot at it with a lens of about 13 inches focus, but the result was very poor, and not worth keeping. I felt no very great regret, for I could not go into enthusiasm over the Peak as so many people do. Compared with most glimpses of land that one gets from the sea, it is till and imposing, but then one always estimates a spectacle by compating it with something he has seen before. Teneriffe, though high and steep, is not so steep nor so rugged as the mountains of Switzer land, and one sight of the Matterhorn is worth fifty of Teneriffe. St. Helena was reached in the early morning of February 14th, and our stay there was again very short, as we had to make up for the time lost between Plymouth and Madeira. This time I did not take my camera on shore, and the one photographer there who sold views was able to show his customers little more than mere transcripts of the scenery, and no photographs that presented any attrac tion as specimens of the art. Of all places of desolation, St. Helena must carry off the palm. The opportunities for photographic work that I had on this voyagewere few—fewer, in fact, than on any sea trip I have yet made. One little experience that I had on board, though scarcely photographic, is perhaps worth recording. I brought out my lantern with me, as my stay here is likely to be a long one, and by way of a variety in our shipboard amusements I exhibited a few slides. Paraffin or kerosine is not allowed on board, but they had some mineral sperm oil, which is rather heavier than kerosine. It gave a good light and emitted no smell. I had no standard to compare it with, but I am under the impres sion that my lantern did not at least emit a worse light, if not a better one, than it has done with the lighter mineral oils I have used at home. I purpose giving the mineral sperm a further trial, for I am under the impression that it is well worth adopting. Wo arrived safely at the Cape on the appointed day of arrival, February 19th, and since then I have been making rapid progress in preparing for the work, Preliminary I experiments in photographing the stars have turned out better than might have been expected, and almost as well as one might wish. A few days after my arrival, I ascended with some friends belonging to the Meteorological Department here, to the top of Table Mountain, where some thermometers and rain guages are placed and examined at certain inter vals. I succeeded in obtaining photographs of their apparatus, one of which is given above. CARBON PRINTING. BY W. LANG, JUN.* It seems to me that the three main considerations which stand in the way of the amateur adopting the carbon process are the following :— 1. The necessity of having reversed negatives where the single transfer method is made use of. 2. When the ordinary negative is employed, the troublesome operation of double transfer. 3. The fact that the exposure, as in silver printing, cannot be judged by seeing the actual progress of the picture. Perhaps I should add a 4th. The trouble of sensitizing the tissue. If, however, we develop our carbon picture on a glass support and leave it there, we have the image in optical contact with the glass, and all that is needed is a backing of white paper to bring out the details of the picture. It is this method of finishing a carbon picture I bring before you to-night. It does away with the necessity of the reversed negative, and no transferring opera-, tions are required. The only precaution to be taken with the negative is to provide what is known in carbon printing as the “ safe edge,” which is easily formed by running a black margin all round the negative with black varnish. Instead of black varnish, strips of orange paper may be pasted down on the negative. These margins, as you will see from the specimens lying on the table, in no way interfere with the negative being used for ordinary silver printing. The third consideration is the one that perhaps will weigh most with amateurs. From the nature of the processs no visible image can be dis cerned, and the exposure has to be determined by means of the photometer ; but the method of employing this instrument is soon arrived at, and when once the printing density of a particular negative known, there is no further trouble to be appiehended in this direction. As it is with the developing of the carbon image we are mainly concerned to-night, it will be unnecessary to go further into details. You will see that it is a very simple affair—no turning, no fixing ; all that is required is a fair amount of tepid water. T here is no necessity to work in the dark ; a subdued light is all that is demanded. The plates on which I propose developing the prints have been coated with a gelatine substratum made as follows :—80 grains gelatine dissolved in 5 ounces of water, and 1 ounce of water in which 3 grains chrome- alum have been dissolved, added to warm gelatine solution. The coating that is thus given to the plate is practically invisible. To develop on a plate thus prepared, all that is required is to take it, plunge it into cold water, and bring the exposed tissue, which also has to be put into cold water, on to the prepared surface, squeezee them into contact, and let them stand for a little with a weight super-imposed, and finally immerse the whole in the developing bath of hot water—say at a temperature of about 100° F. Do not disturb the plate for a little, but wait till the paper of the original tissue begins to show signs of coming away of its own accord. It may then be gradually lifted off, leaving the image, which is still hidden under a layer , of unacted-on gelatine, fixed to the glass. By gentle washing, the soluble por tions are by degrees removed, and very soon the image comes into view. When the development is considered complete, the picture is to be washed in a bath of cold water, and to render it insoluble it is immersed in a solution of alum. All that remains is to soak a piece of transfer paper in hot water and squeezee it on to the picture, and allow the whole to dry. If all the fore going operations be properly carried out we should have a pic ture which it would be difficult to tell from a silver print, pro vided, of course, that the tissue used in the first instance has been of that particular shade. As you are doubtless aware, tissue can be obtained in almost any colour, brown, black, purple, but the • Communicated to the Glasgow Photographic Association.
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