The photographic news

• Bandzählung: 6.1862
• Erscheinungsdatum: 1862
• Sprache: Englisch
• Signatur: F 135
• Vorlage: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: SLUB Dresden
• Rechtehinweis: Public Domain Mark 1.0
• URN: urn:nbn:de:bsz:14-db-id1780948042-186200003
• PURL: http://digital.slub-dresden.de/id1780948042-18620000
• OAI: oai:de:slub-dresden:db:id-1780948042-18620000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Bemerkung: Seite 1-72 fehlen in der Vorlage. Vorlagebedingter Textverlust.
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

June 6,1862.] THE PHOTOGRAPHIC NEWS. 275 6,1862 and hus * harsh tr’ lit hadba have giw® tay be de* xposed * crate lie scond de" ting pniP >ut if I* about • the vari0 -I remi ERWOOB. 2. llustrati® apher • a be tab ive him’ se pictun h raw! h receig rming b-1 MEDALS those Pb” ■w drawvin’ 1 be add ng, or aof licited N rd of o* hether t n obsertd d bv pu‘ of Head) publish he o an em wing 7 upon 9 re can 1 | —Ma ereoso ibury;" - e sumu I ' Tuesda) 1 and ooT iers of U I an. I from “ I hat he 00 I ant tot i enlarg" the tiu"t I the i" 1 ' that tM to corred intaned” J n tion, b a that of Mr. Mann, of Bruce Castle, Tottenham. Its claim to attention was that it would give the maximum of exposure in « minimum of time. It opened from the centre on pulling a "ring, on releasing which it closed at once. There was another Wification of it with a trigger movement. He believed it one J the best shutters for the purpose which had yet been pro- wed; and as instantaneous photography seemed to be receiving nereased attention, such a shutter was a decided advantage to Pbotography. The Chairman called attention to some fine reproductions Irom Turner's paintings, by Mr. Thurston Thompson; to a lirseview of St. Paul’s, by Mr. Sand, exhibited by Horne and Thomthwaite; to some views in Australia, by Mr. Haigh ; to Bae portraits of the Japanese Ambassadors, by Caldesi, exhi- Wed by Mr. Kater; to some views of Genoa, by Messrs. Eothergill and Branfill; to a photograph of the Cripple’s Home, 7 Mr. Greenish; and to a large number of fine stereoscopic of the International Exhibition and its contents by Mr. ■ "ngland. I «. CLAUDET then proceeded to read his communications on I 'he subject of enlargement, which will appear in our next. The I BPers were illustrated by the production of the apparatus used. Yarious images were projected on to a screen by means of the "“■r camera, the light obtained from a gas jet and a bull's eye Snndenser, in addition to the solar camera condenser being "ed, The object of the various images was to show the effect "duced by various degrees of enlargement, to illustrate the Thing of his system of ascertaining the respective distances Sthich the negative and the screen required to be placed, and My to illustrate how a drawing in outline of an image thus Aoomn on the canvas might be traced by anyone without a lowledge of drawing, from which, by the aid of a photograph lotted from the small negative, the painter might easily produce Alarge coloured portrait. M. Claudet pointed to a fine large por- nit of Professor Faraday, and to some others which had been Produced in this manner. mIn the course of his experiments, M. Claudet explained and Hlstrated a very simple process, which he stated he had found Iey efficient as a remedy in cases where the film or varnish nad cracked. Few photographers but were familiar with this Ni which rendered a negative quite worthless for printing, lehad found a very simple remedy, which rendered the cracks "visible, and restored the printing powers of the negative. It insisted in taking a piece of cotton wool, and applying charcoal k a very fine powder to the face of the negative ; this seemed t ? fll up the cracks, without showing or in any way affecting 108 Perfect printing qualities of the negative. M. Claudet then 30k some negatives quite honey-combed with cracks, and after WP’ying the charcoal, passed them round for examination ; it i n found that the cracks were in most cases rendered quite "sible. In answer to questions as to whether this improve- bnt would not soon wear of in printing, M. Claudet said he inot observed it, but if it did it was easily renewed. 1 CLAUDET now referred to Mr. Heath’s challenge at the tsemeeting, and called attention to the prints he had pro- o, from Mr. Heath’s negative, and also to those from his anplegative, which had been handed to Mr. Heath to produce kig Sargement from. He now asked if Mr. Heath had brought APPecimens with him. u a few words from the Chairman, ne, r Meath produced his prints from his own and M. Claudet’s ing4liYes, enlarged four times. Ho said he could not help feel- Ho' hat he could not possibly have found a better advocate for dur nhethod he Mad described than M. Claudet had proved the evening. Ho had listened with great attention tion nt erest, and he hoped with profit, to the able communica- 1o wF M' Claudet I but he had been struck by the difficulties remeneh he had referred, as to the question of sun-light. If he helpmbered rightly he said he had despaired of getting the sun to by tli. 1 " 1 Nowlie (Mr. Heath) would undertake to produce results, oeprocess he had described, at any’ time, winter or summer, tiono, nosun, at any time when ordinary photographic opera- tivaj,cou• >0 conducted. In regard to the results of the friendly he“vX ich had resulted in a challenge at the last meeting, hesitatiI now submit them for examination, and he felt no 'ion atron, whatever in soliciting a comparison of the defini- tle lesssompared with the results of the solar camera. He felt hothing pesitation because, as ho had before said, he claimed prove z1or himself in the matter, beyond an attempt to im- known manipulation. All Me had done was to take a well- ethod of enlarging, and by some careful experiments ; endeavour to fix more definitely the conditions yielding the best results. As regarded the character of positive, he thought he had entirely succeeded, and he invited attention to those on the table. He now just wished to say one word on the question of focussing. He had described at the last meeting that having been supplied by Mr. Dallmeyer with the exact equivalent focus of his lens, he simply measured the distances required by means of the scale he had attached to his camera. The best proof of the correctness of the calculations upon which this operation was based, was the fact that by measurement merely, without focussing at all, he obtained definition such as might be seen in the transparent positives on the table, in which he would venture to say every hair was most perfectly defined. He would now leave the specimens in their hands. Mr. Mayall, having been engaged and interested in enlarg ing for a number of years, wished to make one or two observa tions. He thought there could be no doubt about one thing, namely, that the solar camera properly constructed was the best enlarging instrument in existence, because it effected its work without distortion. He was aware that Mr. Shadbolt dis sented from this view, but he thought it was because ho had not seen the instrament in operation to any extent. He was not aware whether M. Claudet had mentioned the fact, but it was important to know that in the solar camera distortion was avoided by the rays being made cross on the front of the enlarging lens at a mere point; every other part of the lens might be cut off without affecting the result. There was, con sequently, no distortion, even if they magnified an image to twenty-five feet high. He thought the method used by Mr. Heath was a round-about method of producing what might bo obtained at one operation. As regarded the novelty of the solar camera, he had a word or two to say. Two years ago, when Mr. Woodward was in this country, he offended some people by saying that the solar camera was not a novelty. Fifteen years ago Mr. Willatt made such an instrument for Dr. Carpenter, the aim being to enlarge microscopic objects for illustrating his work on physiology. M. Claudet enquired if it were arranged for focussing the image of the sun upon the front lens ? Mr. Mayall said it was. Mr. Willatt then came to con sult him upon the subject, and he told him that it would bo quite possible to produce a combination which would enlarge without distorting. He now held in his hand the identical instrument which -was then made, and as its value, historically, was greater perhaps than intrinsically, ho thought it should be in the possession of the society rather than of an individual. He begged, therefore, to present it to the society. Regarding the solar camera, has advice was to use albumenized paper, and print entirely without development, and he believed very fine results could be obtained. It was, ho thought, going backwards to attempt to revive the old method of enlarging at two operations, as Mr. Heath did; and the results were certainly not to be compared with the images pro duced by the solar camera. He believed, with good light and sensitive paper, direct prints might be obtained in from an hour to an hour and a half. He would say, in conclusion, that great praise was due to Mr. Atkinson for the effort ho had made in perfecting and adapting the solar camera to the requirements of the country. Mr. Warner said as his name had been referred to at the last meeting he might be allowed to remark, that whilst M. Claudet had been waiting months for the sun, his own (Mr. Warner’s) enlarged pictures in the Exhibition had been com menced in the month of February’ in the pouring rain. Ho found that nothing short of fog stopped his operations. Mr. Heath wished distinctly to remind the meeting that ho had not introduced the question of the solar camera at all. It was not a question of his method versus the solar camera method, but simply thus : he desired to enlarge small pictures up to 12 by 10, and he described a method by which he could effect it with better results than he had seen by other methods. He had said nothing whatever in depreciation of the solar camera except that it required the light of the sun, which in this country could not always be obtained. The Chairman said it must not be forgotten that there wore other countries besides England, where sunlight was plentiful and powerful. Referring to M. Claudet’s method of focussing, ho offered his opinion as a mathematician, that it was mathe matically correct. Mr.DALLMEYER referring to an expanding and collapsing dia phragm which M. Claudet had shown and described, said that