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The photographic news
- Bandzählung
- 27.1883
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- 1883
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1293, June 15, 1883
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The photographic news
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Band
Band 27.1883
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- Titelblatt Titelblatt I
- Register Index III
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Band
Band 27.1883
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June 15, 1883. | THE PHOTOGRAPHC NEWS. 373 “ Do you generally wear your eye-glass up? ” we are asked. “ Generally.” We might have added, with truth, that we felt safer with it. “ Ah ! then we will take one picture with the glass, and one without. Have you ever been taken profile? ” “ You mean a sideways sort of portrait,” we venture, innocently. “Yes.” We are bound to admit that we have been taken that way, but nevertheless should very much like to be taken again. So we are posed in profile, and a second picture secured, the head-rest being used in both instances. We should have mentioned, by the way, that when the electric light was turned on, every curtain in the studio was drawn, and the apartment, if not in perfect darkness, was so effectively cut off from daylight, that the latter could have no influence on the portrait. We may mention, too, that the umbrella reflector, instead of loosely hanging aslant with its axis in a line with the sitter’s head, as in most electric studios, was fixed to the stand at right angles to the latter in the way indicated in our sketch. Of conrsp, it could be moved up and down, right or left, but it is always on a firm basis. And we may here remark that as the results appear quite equal to other electric portraits we have seen, this simple plan has much to recommend it. II will trouble you to wait five minutes,” says our friend the principal. “ We like to be quite sure about the results before our sitters depart.” And in the meantime, he holds a friendly chat about his electric light and its details, which, whether valuable or not, we do not, naturally, feel ourselves, under the circumstances, justified in talking about. The assistant brings up the portrait presently, and we all criticise. The principal suggests a softening of the con tracted eye-brow which holds the eye-glass. “ But we mustn’t do too much, or it will give you something of a foppish appearance,” he explains, jokingly. (And has it come to this ? Joke or no joke, we don’t like being set down as foppish. We can conscientiously say that having moved now for some time among the upper circles of Castle Street, Holborn, E.C., no such phrase has ever before been made in connection with our personal appearance.) “ We shall send you some proofs in a couple of days, sir ; but please to note that they will only be rough and untoned prints, just to indicate position and expression. Thank you, good afternoon.” “ Good afternoon -Foppish, bah ! ” NEWS FROM THE ECLIPSE PARTY.* News from the eclipse party has at length arrived. As we stated in our article published on the 4th of May, the American • Timet. ship of war, instead of returning to Callao as was at first anticipated, called at the Sandwich Islands, and there is little doubt that the English party made the voyage thence in one of the Pacific mail steamers. A telegram coming through Reuter’s Agency informs us generally of the successs of the observation. The weather seems to have been everything that could be desired, and although the observations were necessarily made from the lowest possible level, the extension of the corona was quite as great as was expected at this period of maximum solar activity. Further, we learn that the light during totality was quite equal in intensity to that of the full moon. This is another indication of the exceptional brightness of the corona, because in this eclipse, which was one of exceptional duration—and that is why such strenuous efforts were made to observe it—the lower and more brilliantly illuminated portions of the sun’s atmosphere being more than usually veiled by the dark body of the moon during the middle of totality, the illumination of the air by these portions of the sun was less than is ordinarily the case. Unfortunately, the telegram may be read both ways touching the intra-Mercurial planet observations. We take it, however, to mean that no intra-Mercurial planet was seen by M. Palisa, who would probably give his chief attention to that point. It is satisfactory to learn that good photographs of the corona were obtained both by Dr. Janssen and the English observers. We may expect that the French photographs of the corona will surpass in beauty and detail anything which has yet been secured during eclipse observation. It is good news, too, to learn that for the first time in the history of eclipses the momentary flash of bright lines, seen just before the beginning and immediately after the end of totality, has been photographed. Reverting for a moment to our previous article, we would remind our readers that this end has been attained by the use of a slowly decending plate actuated by clock-work, which since the flash has actually been photographed, will give its complete history, and enable us to determine the exact order in which the lines appeared and re-appeared before and after totality. The telegram sent by the English observers, Messrs. Lawrance and Woods, to the Science and Art Department supplies further particulars as to the results of the various attempts at recording the history of the eclipse. The first instrument on the official list is a Rutherford grating with 17,000 lines to the inch, which was used in conjunction with an equatorial telescope of six inches aperture. The grating was so arranged that photographs of the green part of the first order spectrum on the one side and the same part of the second order spectrum on the other side should be attempted. This would give the region near F one of the chief solar lines in the blue-green parts of the spectrum ; but, although the photographs were actually obtained, the observers do not seem to be very proud of them. The next instrument is a Dent’s prism of 60°, mounted on a six-inch equatotial of very short focus. The object in view in employing a short focus was to obtain a very small and .in tensely bright image of the corona, while the use of the prism of 60°, giving as small a dispersion as possible, still allowed a really useful amount to be secured. This instrument succeeded well. We do not know the number of photographs obtained by it, but if the instructions were carried out to the letter, seventeen should have been obtained. We come next to the instrument by means of which the photograph of the flash of bright lines to which we have referred was obtained. This on the official list is called the “ integrating Hilder.” It is a sprectroscope armed with a collimator of very great focal length, and directed merely to the sun’s place, no image of the sun or corona, therefore, falling on its slit as is usually the case. The light from all the regions near the sun is mingled together, a photograph of the spectrum of this mix ture being the special aim of the instrument. Messrs. Lawrance and Woods are evidently satisfied with the work in this direc tion, the code word they use indicating that they consider the results to be good ones. The moving plate with which the instrument is fitted was exposed two minutes before, and with drawn from exposure two seconds after, totality. Knowing, therefore, as we do, that one flash was photographed, we may reasonably hope that this was the case also with the other, and as the instructions were to allow the plate to fall through one inch in eight minutes, we may also expect to get a comparison between the flash before, and the flash after, totality. The slit spectroscope armed with two prisms, which was used by Captain Abney for the observations made last year in Egypt, was utilised also on this occasion with good results. Only one
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