The photographic news

• Bandzählung: 7.1863
• Erscheinungsdatum: 1863
• 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-id1780948042-186300004
• PURL: http://digital.slub-dresden.de/id1780948042-18630000
• OAI: oai:de:slub-dresden:db:id-1780948042-18630000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

question. These were marked at the back with the name of the lens with which they were produced; a few of the earlier slides were produced by French single lenses, a couple by Jamin’s quarter-plate portrait lens, several by Ross’s 4 inch focus single stereo-lens, and the remainder by Dallmeyer's new form of single lens; the size of the stop used, however, was not stated. Mr. Dawson also showed one of Harrison’s new globe lens which he had been trying. The equivalent focus was about 104 or 11 inches; he had tried one or two negatives, but the day was very unfavourable for such a test. An image consisting a test object of a series of vertical and horizontal lines, was given quite free from distortion and well defined on a 12 by 10 plate ; an hour’s exposure being necessary in the very dull light of that morning. An image of the same object on the same sized plate was equally free from distortion, and as well defined with one of Ross’s new triples of 9 inches focus. A pair of views, chiefly of house tops, taken with the two lenses in question, were also exhibited, in these the advantage appeared to be possessed by the lens of larger focus. They were produced with similar stops in about the same time, and both on 12 by 10 plates. Mr. Dawson in answer to Mr. Simpson, said his test sheet was about 23 inches long. Mr. Simpson remarked that in producing an image so large in proportion—about half the size of the original—the focus became of course practically lengthened. In answer to a question Mr. Simpson stated, that the price of the lens now exhibited was, he believed, £15. Mr. Martin said he had understood it to be £19. After some further conversation, the names of the officers elected for the ensuing year were announced as follows : President.—Charles Woodward, F.R.S. Vice Presidents.—G. Shadbolt and G. Dawson. Treasurer.—D. W. Hill. Committee.—G. Wharton Simpson, W. Hislop, J. Shave, W. W. King, W. J. C. Moens, F. Bedford, T. A. Barber, E. W. Foxlee. The proceedings then terminated. PIOTOGRAPIIIC Society of Philadelphia* Thibd stated meeting, held Wednesday, February 4th, 1863. Meeting called to order by President C. Guillou. The room committee reported having completed the furnish- ing of the room, and urged the members to donate to the library such books and back numbers of the journals as they could spare, and to make use of the walls of the room to dis play photographs of interest, which they could change from time to time and thus by variety keep up the attraction. They report that to Mr. Hugh Davids they are indebted for the gift of a book-case; and to Mr. Pearce for a bulletin board. Corresponding Secretary Coleman Sellers read a letter from Mr. Robert Shriver, Cumberland, Md., thanking the Society for the compliment paid him in electing him corre sponding member. Also a letter from Mr. Charles Waldack, Ghent, Belgium, full of kind wishes. One from Mr. Black, of Boston, promising some large photographic views, and giving a short history of the spirit photographs. One from Messrs. Seely and Bartlett, of New York, offering to donate to the Society the back volumes of the American Journal of Photo graphy. Messrs. Robert Wise, and Robert Sturges, were elected members. The Secretary, Mr. J. C. Brown, then read a letter which had been published by Dr. Childs, giving his account of the spirit photographs, and having his first proof of their genuine ness in the fact that the New York Photographic Society pro nounced them a humbug, as in the case of Galileo and others °f the old philosophers in the days of darkness, and the dis cussion of the learned bodies of those days. During the read- nig of the paper quite a number of the spirit pictures were Passed around for inspection, and were examined with interest, but did not strike any of the members present as convincing proofs of their being genuine. Various ways of producing the pictures were proposed, but as there were no believers in sPirituation present, the argument was rather one sided, and the matter was soon dropped. he President exhibited a number of etchings by Spack- man, as an introduction to some prints made by a company in * From the American Journal of Photography. New York, and which are to be printed from copper type said to have been made by a new process. He said ho would not give any further detail of the process used further than that a glass was coated with some compound (as on the plan of Pretsch, which was, he believed, gelatine and bichromate of potash), and then dried. This exposed to the light under an engraving or an etching on collodion films, and then soaked in a liquid which would swell up all but the lines; on this surface the copper is printed direct, and this copper plate used as a block to print from. A sample of the copper plate was shown. Coleman Sellers read a paper on “ Secret Formulae,” which was intended mainly to show that a pamphlet published in New York, and sold for three dollars, was descriptive of what had been long known, viz., that nitrate of ammonia added to the silver bath would allow a weaker solution of silver to be used for albumen paper, and the fuming with ammonia would surpass the requisite alkalinity without injury to the surface. The President passed around for inspection some of the negatives made at the Imperial printing office of Vienna, and which consisted of films separated from the glass. He supposed that gelatine was the substance used, but the gentleman who had brought them to him was no photographer and could not describe the process, although he had seen it at Vienna. The Secretary exhibited some prints from negatives made into a six-inch focus globe lens, and stated that he had heard that these new lenses were considered quick workers, but he did not think so. That he in company with Professor Fairman Rogers had taken a short photographic excursion, and that he had taken his six-inch Harrison globe and a Voigtlander orthoscopic lens of ten or eleven inch focus. He had exposed five or six plates, but that the day was so cold that the films were frozen (he was working wet collodion), and that with the Voigtlander he could get better definition with a large opening and could work quicker than with the Harrison. He merely wanted to say that he had been disappointed in the rapidity of the working, and did not think he couldsecure clear definition except with the very smallest stop. Professor Rogers was of opinion that the test of that day was hardly a fair one, as it was very cold, and his own dry plate seemed to take longer exposure than usual. He alluded to the freezing of the wet films, and said the crystals were very beautiful thus formed. He had never had much experience with the working of wet collodion in cold weather, but pre sumed Dr. Hayes’s experience in the Arctic regions would throw some light on it. Mr. J. P. Sargeant said that Dr. Hayes had laboured under many disadvantages, not having any practical knowledge of photography, but that his negatives were quite good consider ing the circumstances, and had not heard him complain of any trouble except what were incidental to young beginners. During this conversation, Mr. Hugh Davids, who is a land scape painter and has a room over that of the Society, retired for a few minutes, and returned bringing with him a negative and print from it, which he had made with an- eight-inch Harrison globe, at six o’clock p.m., in the latter part of August last; the subject was principally foreground of weeds and stones, with dense masses of trees for the background ; size of plate 8 by 10, exposure, wet, forty-five seconds; it was fully timed. He said he considered the globe lens as a quick worker, and had used a large opening in making the picture exhibited, which was very sharp in all parts of the field. Coleman Sellers said he had tried the identical lens in presence of Mr. Browne, and had produced a good picture on a cloudy day in less than one minute; ho did not think them slow workers, but hoped some of the gentlemen present who had these lenses would 'give some account of their experience with them. Mr. E. Borda had been using the globe lens for a long time, and considered them very quick ; with the smallest stop less than one-eighth of an inch diameter, he had produced a good picture wet, in a fraction of a second, and with tannin plates in fifteen seconds by fuming. This led to many questions as to the particulars of his fuming, which Mr. Borda answered substantially as follows:— The plan of fuming plates had been suggested to him by Mr. II. T. Anthony, who had tried it some two years before he told it to him; but that Mr. Anthony fumed his plate before ex posing. Mr. Borda fumed after exposing and before develop ing. He now fumed at least nineteen out of every twenty plates exposed: he could accomplish two important results : first, he could diminish the time of exposure ; second, lie could