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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. 1270, January 5, 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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The plates which were successful are twenty in number. In all these the coronal form appears to be present. This appear ance dees not consist simply of increased photographic action immediately about the sun, but of distinct coronal forms and rays admitting in the best plates of measurement and drawing from them. This agreement in plates taken on different days with different absorptive media interposed, and with the sun in different parts of the field, together with other necessary pre cautions observed, makes it evident that we have not to do with any instrumental effect. The plates taken with very short exposures show the inner corona only, but its outline can be distinctly traced when the plates are examined under suitable illumination. When the ex posure was increased, the inner corona is lost in the outer corona, which shows the distinctly curved rays and rifts peculiar to it. In the plates which were exposed for a longer time, not only the sun but the corona also is photographically reversed, and in these plates, having the appearance of a positive, the white reversed portion of the corona is more readily distinguished and followed in its irregularly sinuous outline than is the case in those plates where the sun only is reversed, and the corona appears, as in a negative, dark. Professor Stokes was kind enough to allow me to send the originals to Cambridge for his examination, and I have his per mission to give the following words from a letter I received from him : “ The appearance is certainly very corona-like, and I am disposed to think it probable that it is really due to the corona.” Professor Stokes’ opinion was formed from the appearance on the plates alone, without any knowledge of their orientation, and without the means of comparing them with the eclipse plates taken on May 17. I have since been allowed, through the kindness of Captain Abney, to compare my plates with those taken of the corona in Egypt during the eclipse of May last. Though the corona is undergoing doubtless continual changes, there is reason to believe that the main features would not have suffered much alteration between May 17 and September 28, when the last of my plates was taken. This comparison seems to leave no doubt that the object photographed on my plate is the corona. The more prominent features of the outer corona correspond in form and general orientation, • and the inner corona, which is more uniform in height and definite in outline, is also very similar in my plates to its appearance in those taken during the eclipse. Measures of the average height of the outer and of the inner corona in relation to the diameter of the sun’s image are the same in the eclipse plates as they are in my plates taken here. There remains little doubt that by the method described in this paper, under better conditions of climate, and especially at considerable elevations, the corona may be successfully photo graphed from day to day with a definiteness which would allow of the study of the changes which are doubtlessly always going on in it. By an adjustment of the times of exposure, the inner or the outer corona could be obtained as might be desired. It may be that by a somewhat greater restriction of the range of refrangibility of the light which is allowed to reach the plate, a still better result may be obtained. Plates might be prepared sensitive to a limited range of light; but the rapid falling off of the coronal light about H would make it undesirable to endeavour to do without an absorptive screen. Lenses properly corrected might be employed, but my experience shows that excessive caution would have to be taken in respect of absolute cleanness of the surfaces and of some other points. There might be some advantage in intercepting the direct light of the sun itself by placing an opaque disc of the size of the sun’s image upon the front surface of the absorptive screen. Though for the reasons I have already stated I did not attempt eye-observations, there seems no reason why, with suitable screens, and under suitable atmospheric conditions, the corona should not be studied directly by the eye. There might be some advantages in supplementing the photographic records by direct eye-observations. I regret that the very few occasions on which it has been possible to observe the sun, has put it out of my power to make further experiments in these and some other obvious directions. P.S.—[I have Capt. Abney’s permission to add the following letter this day received from him :—“ A careful examination of your series of sun-photographs, taken with absorbing media convinces me that your claim to having secured photographs of the corona with an uneclipsed sun is fully established. A comparison of your photographs with those obtained during the eclipse which took place in May last shows not only that the general features are the same, but also that details, such as rifts and streamers, have the same position and form. If in your case the coronal appearances be due to instrumental causes, I take it that the eclipse photographs are equally untrustworthy, and that my lens and your reflector have the same optical defects. I think that evidence by means of photography of the existence of a corona at all is as clearly shown in the one case as in the other.”—December 15, 1882.] DARK SLIDES AND MULTIPLYING BOXES. We have been favoured by the Editor of Anthony's Bulletin with the following account of the legal proceedings in America relating to dark slides and multiplying boxes. The subject is of interest apart from its law aspect, since it gives us a very good history of the apparatus for years past, and no doubt many of our readers will be both sur prised and amused at some of the claims that are put forward. In old Daguerreotype times, as early as March, 1846, the desira bility and necessity of taking two or more pictures upon one plate by successive exposures was recognized and practised. The first person known to have adopted this practice was Mr. William A. Pratt, in 1846, Alexandria, Ga. According to the evidence adduced on the trial of the suit of Southworth and Wing against E. and H. T. Anthony and Co., it was proved that a large number of persons followed this practice, using different devices. Mr. Pratt’s device or apparatus consisted of a mechanism by which a sensitive plate was movable inside of a frame into four positions opposite an aperture through which the pictures were taken. The apparatus patented by Southworth and Haines was a duplicate (April 10, 1855) of that of Pratt, excepting that he added a little block working on a hinge and attached to the out side frame, by means of which he partially guided and held in proper position (opposite the aperture) the movable plate. This was the position of things until the practice of making small pictures to be attached to visiting cards was initiated in Paris and called carte-de-gisite pictures. We do not know what exact device for multiplying these pictures was used in France, but the first person to get up an apparatus for the purpose different from that of Southworth was Mr. A. Semmendinger, February 21st, 1860, who obtained a patent for making successive pictures upon a single plate by pushing a plate held in an ordinary plate shield horizontally into different positions opposite the aperture through which the lens acted. In this way a series of negatives was taken upon one side of the plate ; to get another series the shield was closed, withdrawn from the box, turned over vertically, and, the same operation being repeated, a similar series of negatives was obtained on the other portion of the plate. The number of negatives which could thus be taken was practically only limited by the length of the plate. The introduction of this apparatus gave a great impetus to taking small portraits, and very soon apparatus was contrived for making prints suitable to be put on a mount of the size of an ordinary visiting-card. As the appa ratus used for this purpose was more effective than that patented by Southworth, he surrended his original patent and obtained a re-issue September 25th, 1860. The claim on this re-issue was as follows : “ What I claim as my invention and desire to secure by letter-patent, is bringing the different portions of the same plate or several smaller plates successively into the field of the lens of the camera substantially in the manner and for the purpose specified.” This claim evidently covered any and all modes of moving the plate. Having secured this re-issue Messrs. Southworth and Wing began to construct new apparatus and to license photographers to use it, and it was not long before suit was brought for infringements. A suit brought against Richardson having been decided in favour of the patent gave the patentees full swing, and the profession generally were laid under contribution. Under that decision we purchased a licence for using the sliding plate-shield, and advised the profession that the patent had been sustained, and that although we did not admit the validity of the re-issue, it was necessary to obey the decree of the Court. As a great many persons did not wish to pay the charges and use the machine sold by Wing, apparatus was made to be used with groups of lenses, so that a number of pictures might be made
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