Suche löschen...
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
- Lizenz-/Rechtehinweis
- Public Domain Mark 1.0
- URN
- urn:nbn:de:bsz:14-db-id1780948042-186300004
- PURL
- http://digital.slub-dresden.de/id1780948042-18630000
- OAI-Identifier
- oai:de:slub-dresden:db:id-1780948042-18630000
- Sammlungen
- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
- Strukturtyp
- Band
- Parlamentsperiode
- -
- Wahlperiode
- -
- Bandzählung
- No. 237, March 20, 1863
- Digitalisat
- SLUB Dresden
- Strukturtyp
- Ausgabe
- Parlamentsperiode
- -
- Wahlperiode
- -
-
Zeitschrift
The photographic news
-
Band
Band 7.1863
-
- Titelblatt Titelblatt -
- Ausgabe Ausgabe 1
- Ausgabe Ausgabe 13
- Ausgabe Ausgabe 25
- Ausgabe Ausgabe 37
- Ausgabe Ausgabe 49
- Ausgabe Ausgabe 61
- Ausgabe Ausgabe 73
- Ausgabe Ausgabe 85
- Ausgabe Ausgabe 97
- Ausgabe Ausgabe 109
- Ausgabe Ausgabe 121
- Ausgabe Ausgabe 133
- Ausgabe Ausgabe 145
- Ausgabe Ausgabe 157
- Ausgabe Ausgabe 169
- Ausgabe Ausgabe 181
- Ausgabe Ausgabe 193
- Ausgabe Ausgabe 205
- Ausgabe Ausgabe 217
- Ausgabe Ausgabe 229
- Ausgabe Ausgabe 241
- Ausgabe Ausgabe 253
- Ausgabe Ausgabe 265
- Ausgabe Ausgabe 277
- Ausgabe Ausgabe 289
- Ausgabe Ausgabe 301
- Ausgabe Ausgabe 313
- Ausgabe Ausgabe 325
- Ausgabe Ausgabe 337
- Ausgabe Ausgabe 349
- Ausgabe Ausgabe 361
- Ausgabe Ausgabe 373
- Ausgabe Ausgabe 385
- Ausgabe Ausgabe 397
- Ausgabe Ausgabe 409
- Ausgabe Ausgabe 421
- Ausgabe Ausgabe 433
- Ausgabe Ausgabe 445
- Ausgabe Ausgabe 457
- Ausgabe Ausgabe 469
- Ausgabe Ausgabe 481
- Ausgabe Ausgabe 493
- Ausgabe Ausgabe 505
- Ausgabe Ausgabe 517
- Ausgabe Ausgabe 529
- Ausgabe Ausgabe 541
- Ausgabe Ausgabe 553
- Ausgabe Ausgabe 565
- Ausgabe Ausgabe 577
- Ausgabe Ausgabe 589
- Ausgabe Ausgabe 601
- Ausgabe Ausgabe 613
- Register Index 619
-
Band
Band 7.1863
-
- Titel
- The photographic news
- Autor
- Links
- Downloads
- Einzelseite als Bild herunterladen (JPG)
-
Volltext Seite (XML)
March 20, 1863.] THE PHOTOGRAPHIC NEWS. 143 A conversational discussion on this subject followed in which Mr. Blanchard mentioned the curious circumstance that a certain pair of negatives, printed on the same paper at the same time, in the same light, and with the same exposure, one gave a red print and-the other a purple tint, the result always being the same. Mit. Hart had noticed that on mixing chloride of ammonium With albumen a decomposition took place, in which ammoniacal gas was given off. The chlorine either combined with some base in the albumen or with the albumen itself. The prints on such paper were probably redder because there was a less amount of base. He had printed two pictures which he would then show—one on normal albumen, the other on albumen with chloride of ammonium. When the ammonium paper was fully printed the albumen paper only showed signs of appearing; in fact, it took three times as long as the other to print. In toning the ammonium print occupied twelve minutes and the albumen sixteen minutes. The albumen alone never got deeper in the Pressure frame than a salmon colour. Regarding coagulation, he had some experiments in progress which would he hoped throw light upon it. If the albumen combined with the silver, What became of the nitric acid liberated ? That would act very specifically on the albumen, for it was well known that nitric acid was the most powerful test for albumen, a five thousandth Part being sufficient to produce insolubility. Mr. Wharton Simpson said that one important element in giving this specific colour to the print in the pressure frame had not been noticed. He referred to the kind of light in which they were exposed. Most photographers would have observed, that paper which, exposed to soft diffused light, Printed with a blue or purple tint, when exposed to sunlight assumed a red tint. He had recently carried the matter further, and but for the pressure of more immediate duties, he would have completed experiments to the present meeting. He found, When submitting a piece of sensitive paper to the concentrated light of a lens, that a still different tint was produced, so that three distinct tones were produced on one piece of paper, the difference caused by light alone. At one end of a piece of Paper, placed at the focus of a lens in sunlight, the tint produced Very rapidly was of an orange tint, and that produced, it was Te ry slow to go beyond it; direct sunlight gave a reddish brovn, and diffused light a purple. These distinctive diffe- Inces’were less marked after toning and fixing, but they still Temained the same in character. Mr. Harman and Mr. HATT confirmed the view that the character of the light largely influenced the colour. Mr. Howard suggested that heat might have something to do with the colour. . After some further conversation, Mr. Harman, referring to Mr. Price’s summary of questions said, that he found vigour to epend largely on the use of a strong solution and short float- ng, the prints were produced by shorter exposures, and were "nore brilliant. Mr. Price asked if in such case ho found it necessary to Print deeper, or if the prints lost more in toning and fixing tan with a weaker bath. Mr. Harman did not find any deeper printing necessary. This view was confirmed by Mr. Davis and Mr. Leake. . Mr. T. R. Williams quite agreed with the remarks of Mr. Harman, especially as to the advantage of prints appearing red ID the pressure frame. A great advantage was the possibility ‘hen of seeing exactly the amount of toning effected, which "'as very difficult where the print was blue to begin with. Re- Warding the use of barium, he felt assured of its advantage, and had used five grains of barium and five grains of ammonium ° r many years. There appeared to him considerable misap- Prehenson to exist regarding the necessity, under all circum- Bfances, for over-printing. In his establishment they scarcely Printed any deeper than was required in the finished print. This, through the experiments of Mr. Cooper, they had dis- SOyered to depend upon the use of distilled or rain water for Washing before toning, as, when common water was used, deeper Printing was necessary. Mu. Leake referred to a recent trial ho had made of some Paper which was albumenized without any chloride. It gave "a5rpoor, meagre prints. Ho had recommended the maker to 2,10 grains of chloride of ammonium, which was attended uh a great improvement in the prints. He thought it a pity mt manufacturers of albumenized paper would not state the Eroportion and nature of the salt used in salting the paper, as present they were obliged to proceed very much on the I principle of putting a lump into a tolerable sized jug. The system of printing was exceedingly empirical. All papers were treated alike both as to silver bath and toning, and no distinction was made as a rule between the requirements of feeble or vigorous negatives. Mr. Simpson said, Mr. Leake’s experience with paper simply albumenized was somewhat at variance with general experience, as excess of vigour and lack of half-tone, was the general result of such paper, as indeed the examples exhibited by Mr. Hart illustrated. Mr. Hart said, in his experience it was almost impossible to get anything but black and white, without half-tone with such paper, Mr. Harman had always found the smaller the proportion of chloride, the slower the printing, and the more brilliant the print Mr. Davis remarked, in reference to the loss in toning and fixing, when common water was used for washing, that he had prepared a piece of plain paper by floating on nitrate of silver ; and obtaining a blue print in the pressure-frame had immersed in chloride of sodium previous to toning, which caused it to assume a bright red colour, showing the reaction of nitrate of silver and chloride of sodium in the print. Mr. Hart had directed attention to the advantages derivable from the use of soft water in a letter to the Photographic News three years ago. He had been in the midst of some serious toning troubles, which the use of a softer water for washing at once relieved him from. After some further conversation, Mr. Simpson moved the adjournment of the discussion, as it was now late, and the subject was not exhausted. This was agreed to, and it was announced that Mr. Harmer would also read a paper “ On Mask Printing,” and Mr. Cooper a brief com munication “ On Substitutes for Albumen.” After a vote of thanks to the Chairman, the meeting was then adjourned. photographit Butts an Queries. Working Hours of Photographers. My Dear Sir,—In your last Number I saw, in the “Answers fo Correspondents,” an allusion to some complaints emanating from the employes of a photographic establishment at Notting Hill. As I know of no other business of that kind in the neighbour hood than my own, I, in justice to myself, beg to offer you the other side of the question. In the first place, no one in my employ has worked more than seven hours and a half this winter and during short days and foggy weather. I will leave you to judge how much of that time could be profitably employed. As the longer days are now coming in I desired the men to work nine hours per day and the boys nine hours and a half. All time beyond that I have always paid for, both to men and boys. A notion seems to have entered their heads that they should work the same hours only as operators employed in the closo confinement of the dark room, and at that requiring infinitely more head work than printing, divided, as it is, into different branches, each one to his own department. Several of my hands I could have well dispensed with, but having had their services through the summer, I have kept them through the winter, and at full wages too. During this winter I have paid a lad to be hero two hours before the others to get the workshops dry and warm, ready for the day’s operations. I now, sir, leave you to judge how tyrannical has been my conduct. Apologising for thus troubling you, I remain, dear sir, yours obediently, W. England. P.S.—Since writing the above I have discovered the chief mover in the affair to be an apprentice in the house, of whoso character the best I can say (after an experience of five years) is that it is very difficult to get him out of bed before 9 o’clock in the morning. •hotograp5s Registered during Hje Past @EAeek. Mr. R. L. Allan, 13, Murray Street, Camden Square, N.W., Portrait of Rev. George Ilogben. Mr. II. C. Booth, Harrogate, Two Photographs of Rev. Arthur Connel. Messrs. BEcKITT and Willis, 20, Newboro’ Street, Scarboro’, Portrait of the late Mr. Harry Beverley, of Scarboro’ Theatre. Mr. War, IIardinc Warner, Ross, Herefordshire, Portrait of Rev. Alexander Crigan, D.D. Mr. E. H. Rhodes, High Street, Nantwich, Three Photographs of Wybunbury Church and Vicarage, Cheshire.
- Aktuelle Seite (TXT)
- METS Datei (XML)
- IIIF Manifest (JSON)