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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
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- Englisch
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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. 1295, June 29, 1883
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Zeitschrift
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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- Titel
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Prgceedings Of Societies. Photographic Society or Great Britain. On Tuesday evening last the monthly social meeting was held in the Gallery, 5, Pall Mall East, Mr. Sebastian Davis in the chair. The standard flanges and camera screws which have been made for the Society were handed round for inspection, and several members expressed regret that the standard camera screws had not been made of hard steel instead of brass, as persons bringing screw-plates or taps for the purpose of com parison would be very likely to damage the soft metal standards. Mr. WARNERKE exhibited a sensitometer frame with some useful modifications. The phosphorescent tablet was hinged to the frame, and the back shutter was so arranged as to effectually prevent light passing ; while a distance-piece, or mask, is pro vided for use in testing wet plates. The Chairman alluded to the convenience which would result from having a much larger sensitometer frame, so that any plate of moderate dimension could be tested. The conversation then drifted into a discussion as to the rela tive sensitiveness of wet collodion plates and dry plates, and Mr. Wabnerke stated that on one occasion he had found a wet plate register as much as 10° on the sensitomer. This was, however, quite exceptional, the plate in question having been prepared by Mr. A. H. Henderson, in whose studio the experi ment was made. Other wet collodion plates gave 4, 3, 2, or sometimes nothing at all. Mr. England referred to the difficulty of setting up anything like a standard for wet plates, and he said that when photo graphing in Paris, he was not able to keep a bath in really quick working order for more than two or three days. Pre-exposure of the plate was next talked of, and Mr. DEBEN- HAM said that by pre-exposing a slow gelatine plate, he had been able to obtain a sensitometer indication which corresponded to no less than sixteen times the actual sensitiveness ; this gain was not, however, real, as such a plate gave a far worse picture than before, and the increase in sensitiveness was only apparent. He considered the sensitometer indications to be of but little value, unless a medium number was taken as the standard of comparison. Mr. WARNERKE referred to Levitzsky’s view, that a prelimin ary “ knock ” was of great value as a means of shortening the time of setting ; and he said that this gentleman had found that an exposure of one second, followed by a rest, and a second exposure of five or six seconds, was practically equal to a simple exposure of ten seconds. Mr. Ashman said that in the case of wet collodion, at any rate, it is far better to give a supplementary exposure, rather than a pre-exposure; and by carefully adjusting this supplementary exposure, it is possible to reduce the exposure to one-fourth or one-fifth. The difficulty of comparing plates sensitometrically was then brought under consideration, as one cannot always eliminate the effects of accidental exposure ; and Mr. Warnerke said that he intended to add another tint to his sensitometer, this to be a standard by which to j udge of density or quality. Mr. Cowan exhibited some plates which tended to confirm Mr. Warnerke’s view that pressure renders the gelatino-bromide film less sensitive, and that the reductions which Captain Abney had found to follow in the track of a glass rod drawn over the film, are due to some secondary cause. London and Provincial Photographic Association. At the meeting held 21st inst., Mr. J. J. BriggenshAw in the chair, Mr. H. S. Starnes said that, having found great difficulty in finding the relative difference of exposure required for gelatine plates, he had calculated a set of tables for use with the metro nome, which he explained at great length, and a discussion ensued. A changing-box, constructed on the principle of the revolving album, was handed round. The Coventry and Midland Photographic Society. At a meeting of gentlemen held on the 20th inst., at the Coventry Dispensary, it was decided to form a society in Coventry, to be called “The Coventry and Midland Photo graphic Society.” Mr. Arthur E. Rollason is the Hon. Secretary pro tem. MK in the Studid. Instantaneous Pictures of Animals in Motion. —A remark able series of pictures has been produced by Captain Francis, of Sydney, the results differing from those of Muybridge in two notable particulars. In the first place, the attitudes appear rather graceful than awkward to the eye; and in the second, the exposures have been sufficient to show full modelling of the animals. A series of pictures representing a dog jumping over a stick is especially noteworthy, the exposures not having exceeded the one-thousandth of a second. Death of Mr. William Spottiswoode.—Universal regret will be experienced at the announcement of the death of Mr. William Spottiswoode, L.L.D., F.K.S., President of the Royal Society, which took place at his house in Grosvenor Place on Wednesday morning last, of typhoid fever, contracted, it is believed, during a visit in Italy. Engaged in the management of the business of the Queen’s printer, he nevertheless contri buted to the Transactions of the Astronomical, Royal Geographi cal, Asiatic, and Ethnological Societies, and the Society of Arts, of each of which he was a Fellow. Among other of his scientific publications may be mentioned his lectures on “ Polarization of Light,” and the “ Electrical Charge : its Form and its Function.” As President of the British Association for the Advancement of Science in 1878, Mr. Spottiswoode delivered an address on Mathematical Science, which he invested wita considerable inte rest. Mr. Spottiswoode was born in 1825, and was, therefore, in his fifty-ninth year. Cardinal Newman.—Mr. Barraud, of Oxford Street, has sent us a copy of a photograph he has recently taken of Cardinal New man. It is the only portrait his Eminence has sat for in a studio, all others having been taken in his room. Mr. Barraud’s work has the double recommendation of being a faithful likeness and an excellent work of art.— The Ti»ie». PHoTOGRAPHIC Copyright—Nottage and Another v. J. H. Jackson.—The plaintiffs in this case carried on the business of photographers, under the name of the London Stereoscopic Com pany, and the defendant sold photographs and other things at Leeds. The action was for penalties upon the allegation that the defendant had infringed the plaintiffs’ copyright in a photo graph of the Earl of Derby, and another of the Australian Cricketers of 1882, by copying and selling the copies of these pictures. They also asked for an injunction to restrain the defendant from doing these things in future. The case was tried a short time ago, and it now came on upon further consideration. Mr. Petheram, Q.C., with him Mr. Shortt, appeared for the plaintiffs, and submitted that his clients were entitled to six penalties of £10 each in reference to the Australian Cricketers. Mr. Justice Field said that he had already ruled that there was no guilty knowledge on the part of the defendant as to the photograph of Lord Derby. Mr. Crump, for the defendant, sub- mitted a variety of points to his lordship. He contended that the plaintiffs were not authors of the “Australian Cricketers” within the meaning of the Act. It was the person who took the pictures who was the author ; and in this case the author was Mr. Reynolds. The statute contemplated a personal authorship, because the copyright was to continue for a certain number of years after the author's death. The statute required the place of abode of the proprietors of the copyright to be registered ; and this, he submitted, meant the place where the proprietors slept. In this case the plaintiffs had registered only their business pre mises, and where, of course, they did not live ; and this, it was submitted, was not sufficient. The case was not concluded when the Court rose. MULIPLEX Camera Backs.—We have received letters on this subject from Messrs. H. and E. J. Dale and from Mr. J. H. Hare, in which these gentlemen maintain that they are the patentees of the apparatus described in our columns a fortnight since, and to which Mr. George Hare referred in our last. Fatal Accident to a Photographer.—On Friday last, when Mr. Monk, photographer, of Great Cambridge Street, was return ing home, he fellover a piece of wire which was stretched across the footway, and the shock to bis system was so great that he died the same night. A verdict of accidental death was returned.
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