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

July 31, 1885.] THE PHOTOGRAPHIC NEWS. 495 Mr. Cowan said that when working on the small scale, he preferred starch paste, as it did not set so easily ; and he also recommended moistening the prints by placing them face down wards on a pine board wetted with a sponge. When the prints had acquired sufficient moisture, while still resting on the board, he pasted them over with the starch, and after each operation the board was cleaned with the sponge. Mr. WATNERKT always employed, as a mountant, a mixture of dextrine, glycerine, and alcohol. The dextrine apparently formed a compound with glycerine, and thus prints soon dried, notwithstanding the presence of the latter hygroscopic substance. In his experience, the fading only occurred when the dextrine was impure and showed acidity ; it was thus necessary always to employ a pure sample. With such a mixture the mounting is very easy, and the prints do not cockle. Mr. Atkinson had found an india-rubber solution serviceable for mounting prints in albums, but several members expressed their disapproval of such a mountant. Mr. Shew passed round a series of wide-angle lenses by Prazmowski, similar to those on view at the Antwerp exhibition. South London PHOTOGRAPHIC Society. The annual out-door meeting took place on Saturday, 25th inst., at Hampstead Heath. Notwithstanding the excessively hot day, there was a better attendance of members and friends than for several years past, and on this occasion the meeting was graced by the presence of ladies. Another noticeable feature was that the majority of the company were provided with cameras, a most unusual circumstance at these gatherings of the South London Society. After a pleasant afternoon had been spent upon the Heath, the Company assembled at the “ Bull and Bush ” Hotel, where a substantial tea was awaiting. After tea an adjourn ment was made to a picturesque and retired part of the Heath, where several photographs of the company were taken, most of those who had brought cameras having reserved plates for the occasion. This brought a very successful meeting to a termination. London and PROVINCIAL PHOrOGRAPIIIC Association. A meeting of this Society was held on Thursday, the 23rd inst., Mr. W. M. Ashman in the chair. Mr. A. Cowan showed a sample of brown jelly to illustrate his remarks at the previous meeting on heating gelatine with a certain compound of silver. Mr. W. E. Debenham read a paper on “ The Action of Strong and Weak Hypo Solutions for Fixing Gelatine Nega tives " (page 492). At the conclusion, Mr. Debenham stated that he had used portions of the same plates—viz., pure bromide and bromo iodide—in his experiments, each being cut in wedge form from the centre of a larze plate. Mr. J. B. B. Wellington found that a saturated solution required ten minutes to fix a plate. Per cent. Diluted to 80 with 2} of iodide present, » 60 >> 5 „ » 40 » 3} » » 20 » 5 „ „ 10 „ 8 fixing occupied 1 min. » 1 » „ 2 mins. >> 0 „ „ 5 „ Mr. Debenham : Except the saturated solution, Mr. Wel lington’s experiments agree with my own. Mr. A. L. Henderson slid that when a plate fully charged with water is placed into a saturated solution of hypo, the quantity entering the film would be reduced in strength one- half at least. He had recently soaked one portion of a plate in water about 70° F. twenty seconds before developing; this portion was much slower in starting developing action, but overtook the remainder in two minutes, when both portions were removed from the developer. That portion which had been previously soaked, fixed much quicker than the other. Boiled emulsions fixed quicker than those of ammonia, and he thought Mr. Debenham’s results might have been reversed with a different batch of plates. Mr. W. K. Burton considered that any set of experiments applying to one make of plate could hardly influence other kinds ; but their best thanks were due for the completeness of the experiment, which had been sufficiently laborious, and fully illustrated the points desired. He believed boiled emulsions containing iodide precipitated a portion of that haloid, hence quicker fixation. In the ammonia process there was less, or perhaps not auy, iodide of silver thrown down. Mr. Henderson was very careful to examine a particular boiled emulsion containing much iodide, for evidence of such precipitation, but failed to discover any, and thought iodide of silver did not exist when boiled with excess of bromine. Mr. Debenham said that different speeds of fixation between boiled and ammonia emulsion plates might be due to the size of granules formed by the haloid used; large crystals would require a longer time to dissolve than the smaller, which, being finer, would dissolve more rapidly. Evidence of silver iodide not being altered was found in one of Mr. Henderson’s formulas, wherein the plates made by it required a long time to fix. After some further discussion, a cordial vote of thanks was passed to Mr. Debenham for his paper. Mr. Henderson handed round a negative sent by a friend, in which the margins had developed a density equal to eight times that of the centre, and the portions in the vicinity of the margin were insensitive. The general opinion was that the marks in question were due to insufficient washing. Mr. Burton, in referring to a recent statement that American plates were more rapid than English, showed a 10 by 12 chloride transparency from a negative of shipping on a commercial plate, exposure being F 32 rapid shutter ; the detail was most perfect. Regarding chloride plates, he found they would not keep as well as bromide : he had some 10 by 12 size which had been kept in stock five months ; these were deteriorating, the top plates being quite useless. Mr. Debenham remarked that it would be probably due to storing them in an impure atmosphere. Mr. Cowan had packed a number of quarter plates with sheets of paper between them in 1883, and they had kept well except at the margins not covered by paper ; these portions exhibited a yellow mark on development, which was easily removed with per-chloride of iron and hydrochloric acid. Mr. Debenham thought the reason why chloride plates re quired greater care in storing than bromide, was due to a lesser proportion of gelatine. Messrs. Briginshaw, Cowan, Haddon, and Wellington, each passed round their results made at the Society’s outdoor meet ing. The subjects chosen were good, and elicited favourable comment. The Chairman exhibited a large collection of choice views made by Mr. Albert E. Cox in the environs of Norwich. In discussing a question which arose concerning a peculiar kind of blistering of a gelatine plate, Mr. W. H. Harrison stated that M. E. Stebbing found those portions of the frilled plate more or less rotten where there was little or no image, the dense parts remaining strong. Birmingham PHOrOGRAPMIC Society. The above Society held its monthly meeting on July 23rd, at the Technical School, Bridge Street; the chair was occupied by W. J. Hamson, F.C S., Vice-President. The minutes of the last meeting having been read and con firmed, the election of members was proceeded with, after which B. Karleese, leader of the last excursion to Guy’s Cliff and Warwick, read the report, in which he congratulated the members of the excursion on the fine weather they were favoured with, and the excellence of the work done that day. The party numbered seventeen. G. M. Jones was next called upon to give his paper on “Weights and Measures, and the Making of Solutions” (see page 484). This to photographers is an essential part, and Mr. Jones gave many useful hints to those who had the pleasure of hearing his paper. Prints of the last excursion were next laid upon the table for inspection by the members. Ualk in tge Studio. Stanley’s Combined Focussing Cloth and Camera.—This contrivance consists merely of a conical silk bag placed hori zontally behind the focussing screen, this band being provided