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

October 16, 1885. J THE PHOTOGRAPHIC NEWS. 659 of an inch or more from the edge of the glass. After having done about half-a-dozen negatives, the varnish should be re-filtered and more added, or a freshly filtered quantity should be taken. Having gone through a batch of negatives in this way, it will prove on examination that perhaps one or two in every ten are imperfectly or badly varnished. These are taken one at a time and put in a flat dish containing enough methylated spirit to cover the film, and after soak ing for a minute or so, carefully rubbed with cotton-wool to facilitate the solution of the varnish. The plate is drained from this bath and treated similarly in another, then drained and laid flat on its back to dry, which it does in about two minutes. If stood on one edge, the alcohol will leave marks about the lower part. If when dry there are patches where the varnish is not completely removed, a gentle rubbing with cotton-wool wet with alcohol, with - out re-immersion in the bath, will probably prove efficacious. The re-varnishing of a plate so treated is always an easy matter. For filtering varnish, dry filter paper must be used, and it is convenient to cut the stem of the funnel entirely off, leaving only the conical part, so that it may easily be well cleaned. The funnel and the glass used should be thoroughly cleaned from all dried varnish by a rag moistened with methylated spirit before they are put away. In the same manner any varnish is removed from the backs of the negatives. PHOTOGRAPHY FOR WHEELMEN. Poring these delightful Fall days we know of no greater pleasure than a spin along the country roads on a bicycle. The bracing air, the easy exercise given to all parts of the human frame, the delight of the eye with the surrounding scenery, give new life to a man, which is not to be obtained with the same facility in any other known manner. To add further zest to these rides on the wheel, the art of photography with the modern dry plates lends a peculiar aid. As the rider spins along, his eye catches some little bit of scenery, some quiet nook with bubbling water, or some exquisite vista stretching in the distance, that he would gladly fix in some more permanent form than upon Ine tablets of his memory. To make such a record Posible, t| le manufacturers of photographic materials •e devised very portable forms of apparatus. Our publishers are manufacturing an outfit of this character that leaves nothing to be desired as to completeness, light ness, and (last, but not least), moderate price. We give a cut of their neat little bicycle camera, adjusted ready to take a picture from the back of the wheel steed. By means of a very good single achromatic lens, a picture 34 by 4} inches can be taken, and from having seen the work of these lenses, we believe they leave nothing to be desired as to their good quality. As will be seen by the cut, the camera is attached to the handle-bar of the bicycle by an universal joint, which allows of taking pictures in any direction without turning the machine. Another neat device is a kind of monopod (if we may coin a word), which is adjusted against the hub of the wheel by means of a Y-top, and has adjust able extension to reach to the ground. This sliding brass foot telescopes and shuts up into a length of only about sixteen inches, making a very effective means of turning the bicycle into a rigid camera stand. The camera, lens, and plate-holder are fitted into a sole-leather carrying case with a shoulder-strap, and the whole weighs only two pounds. With such a slight increase in his impedimenta, the bicyclist can add greatly to the pleasure of his journey- ings, by capturing many pretty scenes that will serve as souvenirs of his rambles.—Anthony's Bulletin. NOTES ON THE GELATINE EMULSION PROCESS. BY DR. J. JI. EDER. 1 .— PHENYLHYDRAZINSULPHONIC Acid as a Developer. I recently published a communication upon the property which I had discovered in phenylhydrazin of acting as a photographic developer. I have continued my experiments, and found that phenyl- hydrazinsulphonic acid, when employed in an alkaline solu tion, possesses the same developing properties upon bromide and chloride of silver. In many points this compound appears to excel the hydrochlorate of phenylhydrazin, because chlorine salts act as restrainers. 2 .—General Reduction of Intensity in Too Power fully Developed Plates. I have tried almost all reducers, and have only been satisfied with the per-oxalate of iron and potash, recum- mended by Belitski. This salt, however, does not keep well, and is not everywhere to be met with in commerce. On this account I have employed the following mixture of perchloride of iron and oxalate of potash. A.— 1 part of perchloride of iron in 8 parts of water. B.—2 parts of neutral oxalate of potash dissolved in 8 parts of water. Immediately before use, mix equal parts of A and B. A light green solution is formed, which in darkness keeps for several days ; in the light, one day suffices to decom pose it. Of this mixture a little is added to a fresh strong solution of hyposulphite of soda ; in difficult cases, to each part of fixing solution from a quarter to a half part of iron mix ture may be used. The picture is rapidly and evenly reduced in this bath. The plate is washed before the desired degree of reduction is quite reached, as the process of reduction goes on during the washing. This reducer works satisfactorily upon plates that have been much over-developed, either with iron or pyro, and may even be used upon plates that have been dried. It is, however, to be recommended that it be used before drying, as its action is then more under control. 3.—Reduction of Over-Dense Portions of a Plate. It often happens, in photographing interiors, &c., that certain portions of the negative come too intense, whilst other parts possess the proper amount of intensity, and must not be reduced. In this case reduction should not