Suche löschen...
The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
- 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-id1780948042-188300004
- PURL
- http://digital.slub-dresden.de/id1780948042-18830000
- OAI-Identifier
- oai:de:slub-dresden:db:id-1780948042-18830000
- Sammlungen
- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
- Strukturtyp
- Band
- Parlamentsperiode
- -
- Wahlperiode
- -
- Bandzählung
- No. 1297, July 13, 1883
- Digitalisat
- SLUB Dresden
- Strukturtyp
- Ausgabe
- Parlamentsperiode
- -
- Wahlperiode
- -
-
Zeitschrift
The photographic news
-
Band
Band 27.1883
-
- Titelblatt Titelblatt I
- 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 27.1883
-
- Titel
- The photographic news
- Autor
- Links
- Downloads
- Einzelseite als Bild herunterladen (JPG)
-
Volltext Seite (XML)
July 13, 1883. THE PHOTOGRAPHIC NEWS. 447 dried off with blotting-paper. If details have to be removed, they are rubbed over with a wooden pencil dipped in the solution of caustic potash used for cleaning, then washed with a sponge and water, and blotted off. A piece of felt dipped in nitric acid, one part acid to six of water, is passed over the parts, the acid washed quickly off with sponge and water, and the moisture blotted off as before. Any required insertion may then be made by drawing in or transfer. After correction the plate is etched again, washed clean with water, the ink is washed out with turpentine, and the plate rolled up, cleaned, and proved as before. Corrections may also be made with an etching point; in that case acid is not required. The part is etched, then covered with gum, and the insertions are scratched in with the point, care being taken that the breath does not moisten the gum, or the lines will not retain the ink. Printing ink is then forced into the lines with a dabber made of closely-rolled flannel, worked round and round till the lines are well charged. A sheet of waste or proof paper is laid on the plate, and is passed through the press to drive the ink well into the scratches, and also to remove the superfluous ink ; the remainder is removed with the gum by sponging the plate. If necessary, the plate is washed out with turpentine, and rolled up again. Sometimes, if the corrections are large, or the work has been on the plate for a long time, it may be advisable to remove the ink with potash and acid, and then re-grain the part with a small muller; but practically, the application of the acid is generally found sufficient. Sulphuric acid is sometimes recommended to be used for restoring the surface previous to making corrections. We have found that nitric acid of the strength indicated works more cleanly and effectually. The corrections being finished, the plate is again proved for press order, and, if all is found satisfactory, the printing is proceeded with. (To be continued.) rucerbings cf Societiea. Sheffield PHOTOGRAPHIC Society. The ordinary meeting was held July 3rd, Mr. T. H. Mobton, M.D. presiding. The minutes were read and adopted, and Mr. B. W. Wood was admitted a member. The principal subject of conversation related to the work accomplished at the last excursion of the Society to Chatworth on June 11th. The weather being favourable, results proved highly satisfactory, although the number of plates exposed was below the average. Mr. Rawson contributed a batch of nice stereoscopic pictures. Mr. Dakin a number of good 10 by 8 negatives. Dr. Morton showed several prints. One, he said, was from a plate which became rapidly so dense, even with little pyro, that it was apparently useless. The negative, however, was fixed, well washed, and steeped for a minute in a solution of ferric perchloride (PB) half an ounce to twelve ounces of water. The chloride then dissolved by hyposulphite bath, reduced the image to a good printing quality. Mr. Rawson said one of his plates erred in the opposite direction, some of the detail being very imperfect. He applied a solution of ammonia with a camel-hair brush over the insensitive part, which had desired effect; then completed development. The Chairman exhibited a 12 by 10 portable camera made for him by Mr. J. Taylor ; it weighed, with double slide, 13} lbs., and looked a most servicable apparatus. Ualk in the Studio. Blotting-Paper Especially Prepared for Photographic Use.—Messrs. Morgan and Co., wholesale stationers of Cannon Street, have forwarded us a sample of a blotting and filtering paper, which is said to be free from those impurities which are most liable to act injuriously on photographic preparations. We tested it for hypo and free acid, but found neither. Mr. H. N. King had the honour of photographing, by com mand, at Claremont, on Saturday last, H.R.H. the Duchess of Albany and the infant Princess. According to the Photographic News it takes a week to get out a proof in London. We wonder how long it takes them to get out a dozen portraits ! We should think they would use rapid paper for making proofs.—The Eye. Munich Art Exhibition.—The International Art Exhibition at Munich was opened on the 1st inst. The building now contains 2,232 oil paintings, 310 water colours, 270 plastic works, and 140 graphic productions. Improvement in Glass Manufacture.—At the meeting, on 4th June, of the Paris Academy of Science, M. J. B. Dumas called attention to the substitution, at M. Appert’s glass-works, Paris, of a pressure fan for the blowing into hollow glass ware, that was formeily effected by the mouth of the glass blower. This long and fatiguing expenditure of breath, accompanied by hard work in a heated atmosphere, proved highly injurious to the health, and even fatal in many cases, if continued for a long period. The new system has been successfully carried out on a large scale by M. Appert, whose drawings and photographs have been referred to the committee on unhealthy trades. The molten glass is kept under pressure in reservoirs, whence it flows in channels to each glass-worker (no longer glass blower). The latter has within easy reach, and capable of being handled with the greatest facility, a pipe which affords him the necessary quantity of air, at the required pressure for blowing out the globe, bottle, or other object. The germ of this useful and humanitarian invention is due to a workman of the famous Baccarat glass-works, who, by means of a rude air-pump, blew out his glass without using the mouth; he was rewarded with a prize by the Academy forty years ago.—Jotirnal of the Society of ^rts. Action of Light on India-rubber.—Mr. Herbert McLeod writes to Nature“ In continuation of the experiments described in Nature, vol. xxvii. p. 312, two pieces of caoutchouc tube, about 48 mm. long and 7 mm. wide, were introduced on January 23, 1883, into test tubes containing oxygen confined over mercury. One of these tubes was surrounded by a case of black paper, and both tubes were placed side by side in a north window. On June 27 the tubes were examined: in that exposed to light about 17 co. of oxygen (about three-quarters of the gas the test tube at first contained) had been absorbed, and the india-rubber had become altered, so that on pressing the tube between the fingers superficial cracks were produced. In the other test tube no appreciable diminution of gas had taken place, and the caoutchouc was unchanged, thus fully confirming the results of the former experiments. We may therefore conclude that caoutchouc alters under the combined influence of light and oxygen, but that neither alone produces any effect. Luminosity of Flame. By W. Hittorf (Ann. Phys. Chem. [2], 19, 73—77).—In this paper, the author claims priority over W. Siemens as regards the non-luminosity of gases at the tem perature of molten steel (this vol., p. 539) ; for he observed in the year 1879 that a layer of air surrounding electrodes of platinum, made white-hot by the passage of a current from 1,600 cells, appeared perfectly dark to the eye. The author has repeated the experiment, substituting the iridium for platinum, and using a battery of 2,400 elements, divided into series of 400, 600, and 800; the result arrived at was the same, and though the white-hot iridium anode was melted, yet the gas media, whether of nitrogen, hydrogen, or oxygen, remained per fectly dark. Experiments showed that all gases at this elevated temperature become good conductors of electricity, even at the lowest difference of potential, and on passage of the current no longer emit the spectra of the first order. The temperature at which the non-metallic elements give the spectra of the second order (or line spectra) is considerably higher, and is attained by the momentary discharge of the condenser. Further, it can easily be demonstrated that the luminous gases in Geissler’s tubes are at a low temperature, and that their luminosity is due to a phosphorescence, for the absorptive power of these gases differs from their emissive power, and they behave differently from metallic vapours, which become luminous in the flame. Although the author claims priority over W. Siemens, he yet points out that Melloni deduced the same conclusions from the researches of Draper, and even as early as 1792, Wedgwood noticed that air at the temperature of a furnace is non-luminous, —V. II. V.
- Aktuelle Seite (TXT)
- METS Datei (XML)
- IIIF Manifest (JSON)