The photographic news

• Bandzählung: 6.1862
• Erscheinungsdatum: 1862
• 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-id1780948042-186200003
• PURL: http://digital.slub-dresden.de/id1780948042-18620000
• OAI: oai:de:slub-dresden:db:id-1780948042-18620000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Bemerkung: Seite 1-72 fehlen in der Vorlage. Vorlagebedingter Textverlust.
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

362, lot xau,® the free ivestiga- ey would ning the posed to y should ecember, spers, an ;s by the nanipul ley think Ir. Hays en about revailing sort, and , was one lety. 0“ best pof- . for his ■ Browni mington my other rof"Te alt of the alsofoti s not we e succes ish to 1 ions, no ould an? re should n g rool3 spect th} j event 0 * Societ I the be ntanet inches % !CtedW* f valtal xountr 0 Honorar nior vice il(Messt 7, and tle Treasure; who filled on of r r, and • ■ty, and. redd •• piece* dnesdt t, in 1 ty’spo JULY 4,1862.] THE PHOTOGRAPHIC NEWS. 323 folio, and which were interesting as illustrating the process of Messrs. Petschlerand Mann. The pictures were much admired; and, although the exposure given for the negatives was con sidered to be beyond that required for collodio-albumen, the process certainly improved in general estimation. Mr. WARDLEY remarked that the length of exposure re quired was, perhaps, due to the condition of the collodion. In the Taupenot process this was not an element that affected the result ; but it was otherwise with tlis, for which a sensitive collodion was required for the most rapid results. Mr. CoXsTERDINE also showed some pictures obtained by the Microscopic apparatus, explained by Mr. Parry at a recent meeting of the Society, and the instrument which he had con- structed was handed round the room. The Chairman showed the last result of his experiments in panoramic photography, with an ordinary view lens. In the negative exhibited to the members the joining of the two pic tures could scarcely be perceived. He stated that he was per- ’crering with that method of obtaining pictures, and should be able, he believed, to produce satisfactory specimens at the next Meeting, and he would then go fully into the subject. At Present he would merely observe that the two pictures were “ten with one lens, and that ho did not cause them to overlap each other. Mr. Noton stated that he had an aceto-nitrate bath, which •fer it had assumed tho brown tint which follows the immer- lonof albumenized plates, became quite colourless ; but upon “ding acetic acid it again became discoloured. Mr. WARDLEY said that tho usual bath for tho Taupenot P^ccss always behaved in that manner when the acetic acid had gone off by evaporation: tho more acid that the bath con- lined the darker would be its colour. Taupenot plates, he "ded, might bo excited in a neutral bath which would retain "purity, but they would not keep. ,, Mr. Offer asked whether that plan would not also induce “isters? Mr. WARDLEY thought not. In reference to blisters, ho “'served that they might frequently bo avoided by increasing te strength of the silver bath. i Mr. Noton said that during the last cold weather ho had S8n troubled much with blisters. .Mr. WARDLEY said that in all photographic processes great "tention should be paid to tho temperature of the laboratory, hen it fell below 60° difficulties were certain to arise. Mr. Herbert had observed that humidity in the atmosphere pAsa.great cause of blisters: he had noticed that steam arising tnom the hand during tho coating of tho plate often induced "em, ,,Mr. Petschler said a deposit of moisture must of course take '^ e if the plate were colder than tho atmosphere. RogEisoX said that photographers were in the habit of 1 ing the plate too near the mouth, and a condensation of Bstre was therefore inevitable. He thought it a good plan Brm the plate slightly before coating it with collodion. It 134ls0 a common practice to hold the plate at one corner, and l|5 e tho film was always loose, because tho moisture from the 2" prevented the collodion from actual contact with tho yo’was generally thought that much in photographic opera- 1,8 depended upon the temperature, of the room, to which j Rogerson added “ and that of tho operator.” •" I PESCALEN exhibited some prints taken from negatives ht,; “ Norris’s dry plates. The subjects were exceedingly dresting, they being groups of ladies and gentlemen taken ha ng a recent excursion of tho members of the Field Natu- J 8 ' Society. . DroenaNorox said that in working with his double albumen "ilv? 8 ? he had been making some attempts to get iodido of U c into the film by placing it in tho albumen previously tialnating tho plate—his object being to open out tho mate- wihn WARDLEY thought if tho thing could bo accomplished, nsvput de triment to tho picture, that it would not be likely to I' 1 5 10 end *n view. Ho thought that it would rather tend yordlen the film. ° Ghdteso thanks having been accorded to Mr. Consterdine J ^ ,r nal -hairman, the meeting was brought to a close.—British Aqotagraphir Botes uud Querns. Dear Sir,—The above is a sketch of a plate-holder of my own invention, which I have found very useful for small plates | or J-sizo. If properly made, it will hold the plate quite securely in any position when developing, &c. It may be made of gutta percha, or wood coated with rosin and wax varnish. Rosin 4 parts Wax ... 3 You will see by tho above sketch that tho thick part of tho wood is cut in rather a slanting direction at C, so that the top arm presses firmly on the plate. There is a small place hollowed out at Afor the point of the plate only, and at B a groove about J or 4 in. long andof an inch deep, just the width of tho plate. The arms should be at such a distance than •when a plate is put in, the top arm has to be slightly raised, and rests like a spring upon the corner at A, keeping the plate firmly in the groove at B.—Yours most respectfully, D. Ward. Manchester, June 21st, 1862. P.S.—If made of wood, care must be taken to put a wet plate in after well coating with tho hot cement, and whilst tho cement is hot, to keep tho groove at B, and the round hollow place at A, from being quite filled up. If made well it will hold a plate in the position shown above as firmly as if held in the hand. Eisellaneous. Coal Tar made Picturesque.—If coal bo regarded as the product of ancient sun-force, then the “ light of other days,” which has not faded, may be reproduced in colour of every shade and hue. Every one knows that when coal is distilled gas is produced, is carried away and collected, and that among the refuse products of the process is coal, which was formerly sold at a very low price. Coal tar is a very complicated body, and, when carefully distilled, it yields certain volatile fluids, smelling more or less of tar, among which is a naptha called “ benzole.” Small bottles of benzole are sold for removing grease stains under the name of benzine collas. Benzole is next acted on by nitric acid, and by that means changed into nitro benzoIe—a liquid having so exactly the smell of the essential oil of bitter almonds that it is substituted for it in the manufac ture of almond soaps and of cheap perfumery. When iron filings and acetic acid act upon the nitric benzole it is changed into aniline, and this aniline when acted on by arsenic acid, bichromate of potassium, permangamic acid, stannic chloride, &c., yields a great variety of very beautiful colours. These coal- tar dyes are a characteristic feature of this exhibition. In Per kin’s case the visitor will see a cylinder of solid aniline pur ple, which could easily be carried under the arm. It is worth at least £800, and required for its production the tar obtained from 2,000 tons of coal. It is in tinctorial potentiality equal to 100 miles of calico. Thus are we reminded that deatli in nature is but new life. Force is, indeed, indestructible ; form alone it is which changes. The actual elements caught up from tho air millions of years ago, and then quickened into vegetable life by the sun that shone on earlier scenes than Eden, are now delighting the eye and gratifying the taste. Tho elements of tho decayed forests of a pro-Adamite earth are quickened in 1862, and, re-assembling, show that “ a thing of beauty is a joy for ever.”