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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. 1706, May 15, 1891
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The photographic news
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May 15, 1891.] THE PHOTOGRAPHIC NEWS. 367 stands the following publication, according to Monck- hoven :—"Je viens de decouvrir un proced<5 de photo graphic sur verre par I’ether fluorhydric et le fluorure de potassium, dissons dans l’alcohol h 40°, melds h l'ther sulphurique et satur avec le collodion—je sensibilise ensuite avec aceto nitrate d’argent, et j’obtiens ainsi des epreuves dans la chambre noire en cinq secondes h l'ombie ; je developpe 1’image par une solution trs faible de sul phate de fer. . . .” As Herr Eder does not appear to be very conversant with the French language, I will give the literal transla tion in comparison with the quotation contained in my “History of Photography.” From the Original Text, “Monckhoven.” “ I have just discovered a photographic method on glass, by means of hydrofluoric acid and fluoride of potassium in 40° alcohol, and saturated with sulphuric ether and collo dion. I afterwards treat it with aceto-nitrate of silver, and obtain pictures with it in the camera in five seconds in the shade. I develop the pic ture with very weak solution of sulphate of iron.” The Quotation contained in my Work. “ I have just discovered a process, by which I obtain photographic pictures on glass by means of hydrofluoric acid and fluoride of potassium mixed with sulphuric ether and collodion. Such a mix ture poured upon glass I treat with nitrate of silver, and can obtain pictures with it in the camera in five seconds in the shade. I develop with weak solution of sulphate of iron.” From the original text quoted above, and that placed opposite to it, there is abundant proof that the four mis takes that Dr. Eder pretends to have found out are based on perfectly wrong information on his side, for, first, Legray does not speak of methylhydrofluoric ether, but only of hydrofluoric acid. Herr Eder, in his imperfect knowledge of the French language, takes the term ether fluorhydrique (hydrofluoric ether) for a mixture of hydro fluoric acid and ether, whereas it means, in fact, hydro fluoric acid (gas). Of a methylhydrofluoric acid, which, again, Eder takes for a non-existing organic substance, I have found absolutely no mention, and if perhaps the photographer (not the chemist) Legray may have spoken of methylhydrofluoric ether here and there in one of his other essays, which very likely Herr Eder had possession of, it could only have been in reference to the fact that he had added some methylated spirit to it to make abetter solu tion, as, in those days, the latter was generally considered the best means of solution ; still, it was not a “ non-exist ing organic substance,” for which Professor Eder takes it, but only a simple mixture. Second. It ought to be, as stated in my work, “fluoride of potassium or sodium.” Legray mentions later that instead of fluoride of potassium, sodium may be used; therefore Eder’s assertion that it ought to be fluoride of potassium and sodium is wrong, as it concerns only the formation of fluoride of silver. Third. That Legray writes “aceto-nitrate of silver” proves, not as Dr. Eder believes, that he applied the double mixture aceto-nitrate of silver, but only silver nitrate mixed with the least quantity of acetic acid, which was then exclusively used, but with which nobody meant the double combination. I could, therefore, quietly pass over the word acid as quite irrevelant. Fourth. Dr. Eder’s information that Legray mentioned an exposure of twenty seconds, and not five, as I stated, is not a true statement, as is evident from the above text, authenticated by Monckhoven. I am, therefore, in the agreeable position of being able to maintain all the “ inaccuracies ” (so-called by Herr Eder) that exist in the wording of my “ History,” and, on the other hand, of being able to put down Eder’s state ments as merely the result of his ignorance of facts, and to the determination on his part to prove unpardonable mistakes in my work. (To le continued.') INTERNATIONAL PHOTOGRAPHIC EXHIBITION AT VIENNA.* The International Photographic Exhibition in Vienna, held in the Austrian Museum, was opened on the 4th inst. by the Grand Duchess Maria Theresa, in the presence of Prince Phillip of Coburg-Gotha, Sir Augustus Paget, the English Ambassador, and many other illustrious art patrons. The exhibition is an exceedingly interesting and artistic one, and among the exhibits may be found many masterpieces. The jury have been very strict in admitting only works taken directly from nature, so that out of four thousand sent in only six hundred were hung. The works of both amateurs and professionals were eligible, and we must, before mentioning individual works, call attention to the artistic excellence of the English photographs, which are undoubtedly the best, both as regards figure studies and landscapes. Among the honorary exhibitors are the Princess of Wales, the Archduchess Maria Theresa, and Duke Ferdi nand of Toscana. The photographs of the Princess of Wales are instantaneous. Two schools of photography are represented, the “old” and the “new,” or impres sionist school. In the former the desired result is attained by attention to detail; in the latter, the pictures are worked so as to get an artistic and picturesque effect —just the same difference as is to be found in the paintings of to-day and those of some years ago. Some of the new school photographers even work with a pin-hole camera (without objective), as Alfred Maskell; others, like Lionel Clark, touch up their pictures to such a degree that they appear half paintings and half photographs. Foremost among the impressionists is George Davison, and it must be confessed that both his landscapes and figure pictures make a truly artistic impression. When they are compared with those of J. Gale, who works in the spirit of the old school, one can only say that all roads lead to Rome. Masterpieces are the animal studies of Gambier Bolton ; his young dachshund, his lion, and his tiger are portrayed in a manner which catches their peculiarities to per fection. There are many charming flower studies, and among the best those of Henry Stevens and Robert von Stockert. The artistic value of the photographs of Harry Tolley, Lyddell Sawyer, and II. P. Robinson is world-renowned, just as the Alpine photos of Vittorio Stella arc valued by all lovers of mountain scenery. The exhibition deserves the warmest patronage of the public, and will, without doubt, find it. PHOTOGRAPIIC Club.—Subject for May 20th, “Hand- Camera Possibilities”; May 27th, “ Cameras and Dark Slides.” Bank Holiday outing at Gomshall (Surrey) ; train from Charing Cross at 9.28, London Bridge, 9.35 ; does not call at Cannon Street. * Translated from the Neue Freis Fresee.
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