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
• Rechtehinweis: Public Domain Mark 1.0
• URN: urn:nbn:de:bsz:14-db-id1780948042-188500006
• PURL: http://digital.slub-dresden.de/id1780948042-18850000
• OAI: oai:de:slub-dresden:db:id-1780948042-18850000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Bemerkung: Seite I-II fehlen in der Vorlage. Paginierfehler: Seite 160 als Seite 144 gezählt.
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

Arm 10, 1885.J THE PHOTOGRAPHIC NEWS. 235 the well or reservoir B, is now made to flow in a uniform wave over the plate by bringing the bath steadily to a horizontal position. Mr. H. J. Burton uses these baths successfully for wet collodion plates as large as 48 by 36 inches. The baths are made of pine wood, the back being framed and panelled like a “ flush " door. The joints are all made either by dovetailing, or by means of wooden dowels, and the whole is lined with canvas, which is laid down with marine glue or india- rubber cement, the cement being spread with a heated iron, like a surgical plaster. The canvas is applied to the back, the frame, and the well-piece separately; they are then put together with wood dowels, and the junctures made good with a fillet of cement applied hot, and finished off with a hot iron rod bent to a con venient shape. At the upper end of the bath an ebonite tube is inserted, to allow the contents to be drawn off; and a row of ebonite pegs is inserted in one of the styles, near the lower end, upon which the plates are supported when placed in the bath, and while being drained. A light frame covered with two thicknesses of leather cloth, placed so that the two unprepared sides come close together, makes a close-fitting cover, and which is supplied with lifting hinges to allow of its removal for cleansing purposes. On the sides of the bath, and a convenient place, is fixed a pair of centres, so placed that, when containing the solution, it will lie in a horizontal or nearly vertical position, by simply placing it in the position required, no support being necessary beyond the cradle, which takes the general weight of it. When all is finished, the whole bath should be varnished with several coats of bituminous varnish, such as that sold under the name of “ liquid jet or photographic black,” care being taken that the volatile products are allowed to thoroughly evaporate before the bath is used for the silver solution. Flat trays and dishes are generally used for the development of dry plates and for the various operations incidental to printing on paper, and "here glass is used, it is often convenient to illuminate the dish by an arrangement similar to that suggested by Mr. How- son. ihe diagram almost explains itself; but it may be men ¬ tioned that E is a reflector, and B a sheet of glass of suitable colour—say, ruby or orange. Tin dishes for developing gelatino-bromide plates have been recommended on account of their brightness and freedom from breakage risks: and Mr. W. T. Williams describes a very con venient plate-lifter to be used in conjunction with a metal dish. He says :—“ A B C is a piece of wire hinged to the dish at A B, and rising from the dish in the shape of a handle at 0. By lifting the wire at 0, the plate is, of course, raised from the solution, and can be examined at ease, without coming in contact with the fingers. Paraffined paper is a useful material for making dishes, and Dr. Nicol, writing in one of the YEan-BooKs, gives directions for making them. He says :—“ The paraffin paper may be readily prepared by supporting a sheet of ordinary tin plate over a spirit lamp or Bunsen’s burner, laying a sheet of stout writing-paper on this, and placing a piece of paraffin on the paper. When the paraffin begins to melt, it is moved about over the surface of the paper until it is completely saturated, when it is removed, and an other put in its place and treated in the same way. The sheets are then ironed between blotting-paper, which absorbs the super fluous paraffin, and the process is complete. “ The accompanying sketch will show how simply the trays can be made. A piece of the paper is taken, two inches each way larger than the intended dish ; one inch of each of the four sides is turned up, the corners flattened and folded on the sides, as shown, and fastened by a touch of sealing wax, and the thing is complete, and ready for developing, sensitizing, or any other operation in which neither hot water nor ether is to be employed.” Even a sheet of glazed writing-paper, folded up as indicated, and fastened with sealing-wax or pins, will often make a service able dish for once using. When large dishes are required, it is a very usual practice to make them by framing a sheet of glass with a border of wood, the glass being let into a groove cut in the wooden strips before mitring together. Putty, marine glue, or shellac varnish may be used to make the joint tight, according as the fit is good or bad. Very often, however, it is better to make a large dish entirely of wood, building it up in the manner indicated by the above de scription of the Barton wave bath. Another way of making a paper dish is described by Mr. F. Whitehead, who says :—“ I recently required a dish to silver some paper on, and none could be obtained near where I live. I made a dish in the following manner : First cut out a block of wood the exact size and thickness of dish required. Then take a sheet of cartridge paper, paste it with flour paste and rub in the paste well, letting the paper be thoroughly soaked with it. Then place the paper evenly on the wooden block, turn down the edges smoothly, and double the corners back, rubbing them down well. Be very particular with the first sheet, because if you get that smooth, the rest is easy. Follow with another sheet of cartridge paper, turning the surplus or slack paper at the corners, the opposite direction to the last. Follow with five or six sheets sf old news paper in the same way, and cap with another sheet of cartridge. Put the block with the paper on it into an oven, and bake till dry. Then take out the block and trim the edges. Paint the outside of the paper dish with varnish. Pour some varnish inside the dish and let it soak in, and then pour off the surplus. Bake in the oven again. After the varnish is hard and dry, warm the dish until it is hot enough to melt paraffin wax. Pour some melted paraffin into it, and tilt it about until the bottom and sides are evenly covered; pour off the surplus, and when dry you can use for toning, developing, or even silvering paper. Of course the above is only recommended as a substitute for glass or porce lain when the latter cannot be readily obtained. " &ebiebs. Die BRONISILBRR-GELATINE. Von DR. Paul E. LIESEGANG. Fnste Auflage. Price, 2m. 50 (2s. 6d.) (Dusseldorf-. E. Liescrjaruj), The fact was a new edition of this thoroughly practical work is called for so soon, shows that its merits are thoroughly appreciated in Germany. The present edition is brought well up to date, and includes Wellington’s method of making developmentpaper and the hydroxy lamine developer of Egli and Spiller. THE MITRAILLEUSE OIL LAMP AND PHOTOMETRY. BY WM. LANS, JUN.* LIGHT is undoubtedly the photographers’ sine qua non, and as at the present time rapid printing papers are being put forward which, when perfected, will enable the photographer to be less dependent on solar light than he has hitherto been, artificial illumination becomes to him a matter of primary importance. I trust, therefore, that the oil lamp which is brought before your • Communicated to the Glasgow Photographic Association.