Suche löschen...
The photographic news
- Bandzählung
- 29.1885
- Erscheinungsdatum
- 1885
- 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-id1780948042-188500006
- PURL
- http://digital.slub-dresden.de/id1780948042-18850000
- OAI-Identifier
- oai:de:slub-dresden:db:id-1780948042-18850000
- Sammlungen
- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
- Bemerkung
- Seite I-II fehlen in der Vorlage. Paginierfehler: Seite 160 als Seite 144 gezählt.
- Strukturtyp
- Band
- Parlamentsperiode
- -
- Wahlperiode
- -
- Bandzählung
- No. 1385, March 20, 1885
- Digitalisat
- SLUB Dresden
- Strukturtyp
- Ausgabe
- Parlamentsperiode
- -
- Wahlperiode
- -
-
Zeitschrift
The photographic news
-
Band
Band 29.1885
-
- Register Index III
- Ausgabe Ausgabe 1
- Ausgabe Ausgabe 17
- Ausgabe Ausgabe 33
- Ausgabe Ausgabe 49
- Ausgabe Ausgabe 65
- Ausgabe Ausgabe 81
- Ausgabe Ausgabe 97
- Ausgabe Ausgabe 113
- Ausgabe Ausgabe 129
- Ausgabe Ausgabe 145
- Ausgabe Ausgabe 161
- Ausgabe Ausgabe 177
- Ausgabe Ausgabe 193
- Ausgabe Ausgabe 209
- Ausgabe Ausgabe 225
- Ausgabe Ausgabe 241
- Ausgabe Ausgabe 257
- Ausgabe Ausgabe 273
- Ausgabe Ausgabe 289
- Ausgabe Ausgabe 305
- Ausgabe Ausgabe 321
- Ausgabe Ausgabe 337
- Ausgabe Ausgabe 353
- Ausgabe Ausgabe 369
- Ausgabe Ausgabe 385
- Ausgabe Ausgabe 401
- Ausgabe Ausgabe 417
- Ausgabe Ausgabe 433
- Ausgabe Ausgabe 449
- Ausgabe Ausgabe 465
- Ausgabe Ausgabe 481
- Ausgabe Ausgabe 497
- Ausgabe Ausgabe 513
- Ausgabe Ausgabe 529
- Ausgabe Ausgabe 545
- Ausgabe Ausgabe 561
- Ausgabe Ausgabe 577
- Ausgabe Ausgabe 593
- Ausgabe Ausgabe 609
- Ausgabe Ausgabe 625
- Ausgabe Ausgabe 641
- Ausgabe Ausgabe 657
- Ausgabe Ausgabe 673
- Ausgabe Ausgabe 689
- Ausgabe Ausgabe 705
- Ausgabe Ausgabe 721
- Ausgabe Ausgabe 737
- Ausgabe Ausgabe 753
- Ausgabe Ausgabe 769
- Ausgabe Ausgabe 785
- Ausgabe Ausgabe 801
- Ausgabe Ausgabe 817
-
Band
Band 29.1885
-
- Titel
- The photographic news
- Autor
- Links
- Downloads
- Einzelseite als Bild herunterladen (JPG)
-
Volltext Seite (XML)
178 THE PHOTOGRAPHIC NEWS. LMARCI 20, 1885. different from that to be obtained by other alkalies. As a matter of fact, there was little difference to be seen between one and another of the six plates developed by the aid of the following six alkalies—caustic ammonia, potash and soda, carbonates of ammonium, potassium and sodium. That there was some difference is undeniable. We have noted such difference in our own experimental work, and have noticed a still greater difference in time taken for development, than in the final result. ON BROMINE-ABSORBING POWER OF VARIOUS BODIES. A paper of considerable direct interest to the photo grapher was read before the Glasgow Section of the Society of Chemical Industry some few weeks ago by Dr. E. T. Mills and Mr. T. Muter; these gentlemen having examined a very considerable number of organic bodies (mostly resins) with the view of determining their capability of taking up free bromine. It is needless to remark on the probability that some of those substances which have been found by experiment to possess great bromine-absorbing powers may be found useful as “ chemical sensitizers ” for bromide of silver. The details as to the methods of working adopted by Messrs. Mills and Muter would not very greatly interest our readers; but we may mention that weighed quanti ties of the material experimented upon and of bromine— this latter diluted by a suitable solvent—were left for a sufficient time in contact, the unabsorbed bromine being then determined. Subjoined are some of the results which we take from memoir of Messrs. Mills and Muter — Substance. Shellac bleached Absorption. 4 61 Shellac 521 Gum Benzoin ... 38-90 Amber ... 53-53 Anime ... 60-22 Gamboge ... 71-56 Copal, reduced to 3 by boiling ... ... 84-52 Copal ... 89-93 Sandarac ... 96-42 Kauri ... 108-22 Gum Thus .. 108-54 Dammar ... 117-94 Elemi ... 122 23 Mastic ... 124-33 Sunflower oil 51-45 Haddock liver oil ... 109-84 Anthracene at 119 C. ... 89 89 „ „ at 17° ... 175-33 Para-toluidine ... 74-47 Ortho-toluidine ... 151-34 FRENCH CORRESPONDENCE. Dark-Room Lighting—Sulphocyanide of Ammonium for Developing — Carbonate of Potash and Sul phite of Soda Developer—Incandescent Dark-Room Lamp—Effect of a Yellow Phosphorescent Surface upon Sensitized Plates—Poitevin SUBSCRIPTIONS— Photo-Typographic Blocks. M. Scola's Remarks on Dark-Room Lighting.— At the meeting on February 6th of the Photographic Society of France, M. Scola announced a method of daik-room illumi nation with white light. The possibility of such a thing seemed very attractive, but, unfortunately, all promises are not realised. M. Scola seems to have taken the shadow for the substance, and exposed himself to a smart reply from M. Adolphe Martin, who has put things clearly jn their true light. M, Scola, relying on the one hand upon Mr. Stokes’ curious statements, and M. de Char; donnet’s on the other, has concluded that as silvered plates allow violet rays capable of being photographed to traverse them, the actinic rays of white light were absorbed, and the rays from the reflected surface did not influence sensitive films. In replying, M. Martin said that Foucault's mirrors had often served to obtain astrono mical reproductions, and it had been shown the mirrors yielded a maximum of reflected light amounting to 90 per cent, of the incident light. In short, M. Scola ought to have further assured himself by accurate experiments, and have withdrawn his communication. This explains why the affair was not mentioned in the Bulletin of the Society, although it gave rise to an animated discussion. It was also the cause of the decision passed by the administrative council of the Society not to admit manuscripts to come on during the meeting until they had been given in a cer tain time beforehand, that their contents might be looked through to see if they were suitable. Sulphocyanide of Ammonium Developer.—M. Le Cornet is in favour of a solution of sulphocyanide of ammonium instead of simple hot water for developing carbon prints. He has been experimenting with a twelve per cent, solu tion. If the process be found to show marked improve ment in carbon printing, it seems to me that the same solution might be used with advantage upon photo-reliefs for Woodbury types. The development of a gelatine relief is so long, why not accelerate it by the dissolving properties of sulphocyanide of ammonium, provided it does not dissolve the hardened gelatine ? I rarticularly call the attention of those engaged in photo-relief work to this point. Carbonate of Potash and Sulphite of Soda Developer.—M. Roger, director of the photographic department of the Artillery Museum, has given an account of the advantages presented by the carbonates of soda and potash developer spoken well of by Mr. Newton,, President of the Photo graphic Institute, New York. He regrets that it is but little used in England, and not at all in France. Below are the formulae. In separate bottles are prepared the following solutions : — Sulphite of soda to saturation Carbonate of soda, 25 of the salt to 100 parts water Carbonate of potash 25 „ ... 100 ., Bromide of potassium 10 ,, ... 100 ,, To develop a negative of 74 by 9 ? of correct exposure and under favourable circumstances, Mr. Roger takes the following solution :— Water 200 cubic centimeters Solution of sulphite of soda ... from 5 to 6 „ „ Solution of carbonate of soda ... from 10 to 12 „ „ Solution of carbonate of potash ... from 10 to 12 ,, ,, Pyrogallic acid 0-8 to 1 gramme The quantities are given approximately, so as to allow the operator a certain margin, whether he wishes to accelerate or retard the development. Incandescent Dark-Room Lamp.—An amateur has applied to dark-room illumination a small incandescent electric lamp enveloped in a red glass bulb. It may be worn as a scarf pin by the operator, and a small commutator suffices to biing it into action. Effect of Yellow Phosphorescent Surface upon a Sensitized Plate.—It is known that a sensitized plate, slightly ex posed over its entire surface before putting in the camera and submitting to the action of reflected rays, gives a more rapid and intense impression, due to this first rupture of equilibrium. Partly based on this fact, and also on the acceleration produced from a first impression with yellow rays, I think it would be possible to apply it to all gelatino-bromide plates, to render them more sensitive.
- Aktuelle Seite (TXT)
- METS Datei (XML)
- IIIF Manifest (JSON)