Suche löschen...
The photographic news
- Bandzählung
- 35.1891
- Erscheinungsdatum
- 1891
- 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-id1780948042-189100009
- PURL
- http://digital.slub-dresden.de/id1780948042-18910000
- OAI
- oai:de:slub-dresden:db:id-1780948042-18910000
- Sammlungen
- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
- Strukturtyp
- Band
- Parlamentsperiode
- -
- Wahlperiode
- -
- Bandzählung
- No. 1730, October 30, 1891
- Digitalisat
- SLUB Dresden
- Strukturtyp
- Ausgabe
- Parlamentsperiode
- -
- Wahlperiode
- -
-
Zeitschrift
The photographic news
-
Band
Band 35.1891
-
- Ausgabe Ausgabe 1
- Ausgabe Ausgabe 17
- Ausgabe Ausgabe 37
- Ausgabe Ausgabe 57
- Ausgabe Ausgabe 77
- Ausgabe Ausgabe 97
- Ausgabe Ausgabe 117
- Ausgabe Ausgabe 137
- Ausgabe Ausgabe 157
- Ausgabe Ausgabe 177
- Ausgabe Ausgabe 197
- Ausgabe Ausgabe 217
- Ausgabe Ausgabe 237
- Ausgabe Ausgabe 257
- Ausgabe Ausgabe 277
- Ausgabe Ausgabe -
- Ausgabe Ausgabe 313
- Ausgabe Ausgabe 329
- Ausgabe Ausgabe 345
- Ausgabe Ausgabe 361
- Ausgabe Ausgabe 377
- Ausgabe Ausgabe 393
- Ausgabe Ausgabe 409
- Ausgabe Ausgabe 425
- Ausgabe Ausgabe 441
- Ausgabe Ausgabe 457
- Ausgabe Ausgabe 473
- Ausgabe Ausgabe 489
- Ausgabe Ausgabe 505
- Ausgabe Ausgabe 521
- Ausgabe Ausgabe 537
- Ausgabe Ausgabe 553
- Ausgabe Ausgabe 569
- Ausgabe Ausgabe 585
- Ausgabe Ausgabe 601
- Ausgabe Ausgabe 617
- Ausgabe Ausgabe 633
- Ausgabe Ausgabe 649
- Ausgabe Ausgabe 665
- Ausgabe Ausgabe 681
- Ausgabe Ausgabe 697
- Ausgabe Ausgabe 713
- Ausgabe Ausgabe 729
- Ausgabe Ausgabe 745
- Ausgabe Ausgabe 761
- Ausgabe Ausgabe 777
- Ausgabe Ausgabe 793
- Ausgabe Ausgabe 809
- Ausgabe Ausgabe 825
- Ausgabe Ausgabe 841
- Ausgabe Ausgabe 857
- Ausgabe Ausgabe 873
-
Band
Band 35.1891
-
- Titel
- The photographic news
- Autor
- Links
- Downloads
- Einzelseite als Bild herunterladen (JPG)
-
Volltext Seite (XML)
756 THE PHOTOGRAPHIC NEWS. LOCTOBER 30, 1891. COPYING LINE ENGRAVINGS. There are hundreds of operators who can take a good portrait, and who can be trusted to make a good landscape negative, but if they are required to make a copy of an engraving or line drawing, they fail. The negative is generally so thin that it will not yield a decent print, and, as such negatives are generally required for process work, they should be positively black and white. In other words, the lines should be as clear glass on a dense black background. Mr. John Carbutt, the eminent plate-maker, has recently published in the Photographic Times the method which he adopts in the production of such negatives, and from his article we have taken the following abstract. The engraving or letter-press to be photographed should be placed so as to receive an even-diffused light, not to use a smaller stop than will give good definition, and expose for the whites, not too short, or it will be difficult to obtain density. I recommend carbonate of soda as the alkali, as in the following formulas, with sodium sulphite and potassium bromide, and pyrogallic acid added dry. With these I find it more certain to produce density and clearness of lines on my “ A ” or “ B 12 ” process plates, than with a developer containing the caustic alkalis. I also give a formula for clearing the lines when necessary, and recom mend as a suitable intensifier bichloride of mercury, followed, after well washing, with cyanide of silver. The formulas are as follows: — Alkali Solution. Water ... ... ... ... ... 60 ounces Carbonate of soda (crystals) ... ... 2 ,, Sulphite of soda (crystals) ... ... 4 ,, Bromide of soda or potass. ... ... 60 grains Developer. Alkali solution ... ... ... ... 3 ounces Dry pyrogallic acid ... ... 8 to 10 grains Mix and dissolve before flowing over the exposed plate. Instead of weighing the pyro, a very close approximation to the weight may be got by taking a boxwood mustard spoon that will hold three to five grains of pyro, and measure the quantity required. Water ... ... ... Cyanide of potass, (pure) Iodine (dissolved | ounce alcohol) ... 8 ounces ... 60 grains ... 10 ounces Intensifying Solution. No. 1. Bichloride of mercury ... ... ...240 grains Chloride of ammonia ... ... ... 240 ,, Distilled water ... ... ... ... 20 ounces No. 2. Chloride of ammonia ... ... ... 240 grains Water ... ... ... ... ... 20 ounces No. 3.—Cyanide-Silver Solution. Distilled water ... ... ... ... 6 ounces Cyanide of potass. (C. P.) ... ... 60 grains Distilled water ... ... ... ... 2 ounces Nitrate of silver ... ... ... ... 60 grains Pour the silver into the cyanide solution while stirring, and mark the bottle poison. Let the plate be intensified, wash for at least half-an- hour, then lay in a five per cent, solution of alum for ten minutes, and again wash thoroughly ; this is to ensure the perfect elimination of the hypo. The least trace of yellow ness after intensifying shows that the washing was not sufficient. Flow sufficient of No. 1 over the negative to cover it, and allow to either partially or entirely whiten ; the longer it is allotced to act, the more intense will be the result. Pour off into the sink, then flow over No. 2, and allow to act one minute ; wash off, and pour over or immerse in No. 3 until changed entirely to a dark brown or black. No. 3 can be returned to its bottle, but Nos. 1 and 2 had better be thrown away. Wash thoroughly and dry. I have found it very convenient in being able to produce, on transparent films coated with “ A ” emulsion, various sizes of negatives and positives from type-matter for my advertising blocks, the photo-engraver using them reversed for zinc etching, the thinness of the film allowing perfectly sharp reversed impressions to be made on the zinc by placing the printing frame in a box about twenty inches deep, so as to cut off all but vertical rays. Acid Fixing and Clearing Bath. Warm water ... ... ... ... 64 ounces Hyposulphite of soda ... ... ... 16 ,, Sulphite of soda... ... ... ... 2 ,, Sulphuric acid ... ... ... ... 1 drachm Chrome alum ... ... ... ... 1 ounce Dissolve the sulphite of soda in eight ounces of the water. Mix the sulphuric acid with two ounces of the water, and add slowly to the solution of soda sulphite ; dissolve the chrome alum in eight ounces of the water, the hyposulphite of soda in the remainder ; then add the sulphite solution, and last the chrome alum. This fixing bath will not dis colour until after long usage, and both clears up the shadows of the negative and hardens the film at the same time. Let remain two or three minutes after the negative is cleared of all appearance of silver bromide. Then wash in running water for not less than half-an-hour to free from any trace of hypo solution. If no intensification or clear ing is required, swab the surface with a wad of wet cotton, rinse, and place in rack to dry spontaneously. Clearing Solution With which to clear away any slight deposit in the lines or clear parts of a negative. London and Provincial Photographic Association. —• Subject for Nov. 5th, “Development of Lantern Plates”; Nov. 12th, “ Can Halation be avoided by Staining the Film in any way ? ” ; Nov. 19 th, lantern night—visitors invited. Sitting for Portraits. —The misery of sitting for one’s por trait has been described in graphic fashion ; not so the misery of the portrait painter. Professor Herkomer, who speaks with authority, has come forward to supply the omission. Submit ting the finished work to the family is a trial. Of course nearly every one of the circle had been expecting something different. On one such occasion a lady sitter said to him, “This is an awful moment for both of us.” During that critical examination the painter walked about his studio and tidied up the whole place. Sometimes the sitter’s wife will say, “Just stand next it, dear.” Here Professor Herkomer is of opinion that the artist should turn round and put his foot down, because a picture ought to look right or not right. After awhile, if he is fortunate, somebody will say she “likes it,” and then, but not earlier, the painter should cease from tidying his room. A lady once said to Professor Herkomer, “Do you flatter!” He answered, “No.” “Then,” she replied, “I must go somewhere else.” It is satisfactory to learn on such good authority that photography has not injuriously affected portrait painting in any way. There are, in Mr. Herkomer's opinion, more portraits painted now than at any other time in the world’s history, and it is his belief that the best are done iu England.—Daily News.
- Aktuelle Seite (TXT)
- METS Datei (XML)
- IIIF Manifest (JSON)