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. 229, January 23, 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)
* Read before the Glasgow Photographic Association, January 7th, 1803. the separation has become sufficient to disconnect them, there is a road to travel, a limit to pass, a dilatation to be produced, before the final rupture is effected. There is also, what in chemistry is called, the « nascent state,” being the peculiar condition of a body at the moment when it comes out of a combination, or forms a new one, a state in which it takes its natural course only after the lapse of a given time, and in which it subsists under a more dilated form. Is not a collodioned plate, recently sensitized in the ni trate of silver bath, more impressionable at this moment than later, either when left in the bath or preserved in any other way ? This is particularly appreciable in taking instanta neous pictures. We may, without difficulty, admit that the action of [light brings the salts of silver to the extremest limits of the nascent state, before it effects their visible profit. At this time his father died, leaving a widow and family, and, being poor, he was unable to proceed with his aca demical studies. The success of his first drama inspired him with such high hopes that he entered into theatricals, heart and soul, both as composer and performer, till, meeting with nothing but disappointment and misery for about two years, he gavo up his profession as an actor to try his fortune as an author. The next book he wrote turned out a failure, on account of the printer not having it ready for Leipsic fair; but it gave him occasion often to be in the printer’s workshop, when an ardent desire possessed him to have a printing press of his own, so that he could not only be author but likewise printer and publisher of his own works. He often afterwards said that, if his wish had then been gratified, he would never have been the inventor of lithography ; but as this was not the case, he was obliged to have recourse to other projects. Amongst these was a sort of stereotyping— then etching with acids on different metals with various etching grounds, in which his knowledge of chemistry, gained at school, greatly assisted him. After trying a variety of etching grounds, viz,, melted wax ; turpentine and wax; turpentine, wax, and mastic, &c., with all their failures and disappointments, the one made with wax, soap, lac, and lampblack, which being soluble in water and easy to work with, was perfectly successful. The repolishing of these metal plates, however, was so difficult and tiresome, that he was forced to give them up. A slab of German stone, which he used for grinding his colour's on, suggested the idea that it would not only be cheaper but easier to practise upon, a fine surface being both easily and quickly obtained, and they were so plentiful and cheap that they were commonly used for floors and pavements. He coated the surface of the stone with sulphuric acid, which formed gypsum, and then engraved his work, which he printed (same as with a metal plate) in the copperplate-press, but he never could get more than fifty impressions off, as the gypsum surface soon gave way, whereas, by his matured plan, and as now used, many thousands may be printed on by any careful printer. ON PHOTOLITHOGRAPHY. BY ANDREW MACTEAR.* It affords me very great pleasure, indeed, to bring before your notice this evening, a system of photolithography as practised by Mr. Gibbons, in Glasgow, as far back as 1859, and to submit for your inspection some impressions by it, being the same which I showed to the old society a year ago, and which I am satisfied this meeting will pronounce to be genuine photolithographs, having all the appearance of the chalk-drawing mode. They are not shown as being perfect specimens, but as very creditable, and to show what might be done by its proper cultivation. But before explaining Mr. Gibbons’s mode, if you will allow me, I will give you a short history of the inventor and of the art of lithography itself, which gives employment to thousands, besides ranking as one of the most useful of the fine arts. Germany, where type-printing was invented, and which has been the means of spreading the light of knowledge all over the world, also claims the invention of lithography. Aloys Senefelder was born at Prague, in 1771, but soon after, he removed with his family to Munich. When he grew up he wished to be an actor, like his father, in Munich theatre; but his father was so much against it that he devoted himself to the study of jurisprudence, occasionally gratifying his histrionic appetite by performing in some of the smaller theatres, and employing his leisure hours in writing light dramas—one of which, he having been in duced to publish it, realized him fifty florins clear quently, a movement to perform; like an edifice about to tumble down, carries with it an arch about to give way, so does the decomposition of the nitrate cause the iodide to resume its natural state, and this last modification cannot take place without motion, accelerated locally and through a quasi-reciprocal action, by the successive decomposition of the nitrate. It is not the molecules of the nitrate already separated that we see floating in the developing solution, extracted from the nitrate and fixed upon a place, in quantities which go to form the image by an attraction more or less great in one place than in another : but the molecules of silver are proportionate to the light, more or less, which has acted upon the several portions of the plate. ( To be continued.) decomposition. If we pour the developing solution upon an exposed plate, the development, it seems to us, operates under the following conditions:—The developer, whether sulphate of iron or pyrogallic acid, decomposes the nitrate of silver with which it is mixed, this decomposition is moderated by the presence of a certain quantity of acetic or other acid. The decomposition would take place without the presence of a latent image. The molecules of nitrate of silver, before separating from their combination with oxygen and nitric acid, have a certain road to travel, and, conse- ON THE FORMATION OF THE PHOTOGRAPHIC IMAGE, &c. BY M. ONDIEGAXCK. The constitution of the invisible photographic image has : been the subject of numerous speculations and discussions, ; besides many important studies and researches, among which those of M. Testelin are of special interest. Without wishing to dispute the profound deductions of those who have devoted their attention to the investigation of this phenomenon, it may be permitted to me to offer some ideas, which, if not altogether novel, have certainly the advantage of solving the question in the simplest manner possible. It is indisputable, that wherever there is a modification of the material molecules, there is not only a change in the state of electrical equilibrium, but also a luminous and calorific modification; these three effects being like three chords of an instrument tuned in unison, one cannot be touched without putting the others in vibra tion. Nevertheless, we believe that a rational explanation of the phenomenon, under consideration, can be given by viewing the efficient causes from a more general point of view, instead of attributing them to an electrical influence, or to a kind of polarization produced by light. The question is, What takes place at the moment the bromo-iodized collodioned plate is exposed to the action of light ? If the exposure be sufficient, the image is visible upon the plate in consequence of the decomposition of the salts of silver; the luminous vibration causes this decomposi tion, as heat reduces various salts Of silver to the metallic state, and, to make use of a rough comparison, as the axe splits a log of wood. The luminous agent insinuates itself between the atoms of the iodine and the silver; but before
- Aktuelle Seite (TXT)
- METS Datei (XML)
- IIIF Manifest (JSON)