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The photographic news
- Bandzählung
- 35.1891
- Erscheinungsdatum
- 1891
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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. 1698, March 20, 1891
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The photographic news
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224 THE PHOTOGRAPHIC NEWS. [MARCII 20, 1891. This speed, which we may call half a thousandth of a second, is a severe tax upon the ability of the most rapid lenses and plates to produce pictures. It is obvious that the speed of the shutter may be increased to any desired extent by simply narrowing the width of the slot; but, until the market affords us quicker lenses or plates, there will be no practical advantage in making exposures of less than half a thousandth of a second. The lantern slides of pigeons in flight which will now be thrown upon the screen were made from negatives taken with this shutter, using a slot two-tenths of an inch wide. The length of the exposure was, therefore, one-thousandth of a second, but you will note that the eyes and feathers of the birds are as sharp as if they had been standing still. [Enclosed with the foregoing paper was a print from a plate recently made from one of Mr. Blake’s negatives. The original negative was made during November, 1889, on a 4 by 5 Cramer 50-plate, 1,000th of a second exposure, and developed with Elliott’s single solution hydrochinone developer ; 3B Dallmeyer lens full opening was used. The photogravure plate was made from a negative which was taken from a positive about two diameters larger than the original, using Cramer 30-plates and pyro carbonate-soda developer for both steps of the work.— Ed. P. N.] THE ANTWERP INTERNATIONAL MICROSCOPIC EXHIBITION. Dr. Henri Van HEURCK sends us the prospectus of the forthcoming International Microscopic and Photomicro graphic Exhibition at Antwerp, which will be open during the months of October and September next, a lengthy document, which can be had on application to the general secretary, M. Charles Van Geert, Jr., vice-president of the Floral Circle of Antwerp. The president is M. Charles de Bosschere, the vice-president Dr. Henri Van Heurck, and the other members of the executive committee are MM. Edmond Grandgaignage, Gustave Royers, and Ferdinand Van Heurck. Two other exhibitions will be open in Antwerp at the same time, the one of vegetable products, and the other of horticultural products. At the Microscopic Exhibition, which will take place in the Royal Athenaeum at Antwerp, almost all objects directly or indirectly connected with microscopy will be received, so far as can be judged from the programme. The honorary presidents of the Exhibition are Dr. Abbe, Professor at the University of Jena ; Mr. Crisp, treasurer to the Royal Microscopical Society; and M. Nachet, optician, of Paris. Honorary committees representing various nations have been formed; the English one con sists of Sir J. D. Hooker, honorary director of Kew Gar dens; Mr. John Mayall, Jr., secretary to the Royal Micro scopical Society; Mr. Julien Deby, Dr. Maddox, Dr. Dallinger, Mr. Andrew Pringle, and Mr. A. Comber. Prizes will be given in recognition of the best exhibits. The prizes will consist of diplomas of excellence, diplomas of honour, gold medal diplomas, silver medal diplomas, bronze medal diplomas, and diplomas of honourable men tion. THE FEDERATION OF LONDON PHOTOGRAPHIC SOCIETIES. The following circular has been sent to London and suburban photographic societies:— 11, Lcadcnhall Street, London, E.C. March Uth, 1891. Dear Sir,—I have just heard from the Photographic Society of Great Britain, kindly granting the use of a room at 50, Great Russell Street, Bloomsbury, W.C., for the meeting held there on Monday, March 2nd, and adjourned to Monday, March 23rd, at 8 p.m., and trust your society will be represented by two delegates. Will you please fill in and return to me the enclosed form not later than Friday, March 20th. By way of agenda paper, I append a copy of the resolutions passed at the meeting of the 2nd inst. Will you please be prepared to vote as to whether the first delegates should con tinue in office till the first annual meeting.—Yours truly, Lewis M. Biden. Agenda. Resolutioyu passed at the meeting convened by Mr. L. M. Biden, of Delegates from the London and Suburban Photo graphic Societies, on the 2nd March, 1891. 1. That it is desirable to form an association or federation of societies and clubs whose members are interested in photo graphy. 2. That the London and suburban societies be requested to send two delegates to make the necessary arrangements to settle the name and draw up the constitution of the proposed asso ciation, and to fix the terms of membership, &c., the delegates to have power to appoint a committee for this purpose, such delegates to continue to act for a period not exceeding six months from the launching of the association. 3. That the delegates take into consideration the following objects first: (a) The interchange of lectures, papers, lantern slides, &c.; (b) the obtaining the reduction of railway fares to photographers on their outings, either singly or in parties ; (c) the admission of the various societies joining the federation as corporate members of the Photographic Society of Great Britain ; (d) generally to promote photographic knowledge and research. 4. That the delegates be requested to prepare a list of hon orary lecturers, who, when disengaged, will, without charge or fee, lecture, read papers, give demonstrations and lantern evenings before other societies, and to make rules in connection with the expenses, and otherwise. Mr. Biden adds :—Mr. Buchan proposes to ask for secretaries to furnish prints of London photographs from all negatives in possession of their members, with a view to using them as a commencement of a survey of London. Appended is a copy of the “ enclosed form ” of which Mr. Biden speaks in his letter :— The following Members of the Photographic Society are willing to lend Lantern Slides and to Lecture without fee or payment, except expenses (limited to ) for travelling (and gas !). This is conditional on no special engagement preventing, and the lecture hall being sufficiently easy of access :— Name of Lecturers. Their Private Address. . If possessing Name or Subject of If he will a Lantern and Lecture or Paper, only lend Screen. • and if written. Slides. N umber of Lantern Slides. Leeds Photographic Society.—On Monday evening last Mr. Godfrey Bingley, president of the Society, gave the third of a series of elementary lectures, his subject on the present occasion being " Albumen and Aristotype Printing.” Prints illustrating the processes of printing dealt with were handed round. London and Provincial Photographic Association.— March 12th was a lantern night, and the evening was occupied with the exhibition of members’ transparencies. A large number of slides was projected on the screen, contributed by Messrs. Howard, Chang, Wellington, and others. Mr. W. H. Prestwich occupied the chair.
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