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

624 THE PHOTOGRAPHIC NEWS. [SEPTEMRER 25, 1885. The Hon. SEC. (J. J. Briginshaw) passed round a plate exhibiting a bright line referred to a fortnight previously; the line was distinctly visible in the microscope when focussing. A. Mackie said a very good illustration of the effect in question could be seen in the portrait by Ives in the current Year-Book ; in the companion picture upon an isochromatie plate the lines were absent. W. E. DEBEXHANT pointed out that, in mechanical processes, an imperfect means of pressure might bring about a similar- result, and instanced some productions by the heliotype process. F. H. VARLRY, F.R.A.S., then sketched an illustration upon the blackboard of the path of rays reflected from an object through Canada balsam and other media in microscopic examina tion, and showed the effect of marginal rays crossing those which were more central, thereby causing confusion of a por tion of the image. In microscopic work, he said, the bright lines would be absent if an achromatic condenser were employed. He then drew attention to a new kind of flexible charcoal he had made in thick and thin sheets, as well as in lengths, resembling in appearance ordinary sash line. It was said to be a series of tubes bundled together, thoroughly tenacious, and would withstand an enormous heat. Coloured solutions could be filtered through the sheets, and in most cases decolourised ; while for analysis the residue could be examined in a blow-pipe flame. The flexible tube was said to give a much longer arc ( of an inch) than hard carbon, and the increase in luminosity would be equal to raising a 30-candle incandescent lamp to 200 candles. A current equal to 120 volts would give 250-candle power. He also showed a mounted print which had been soaked in permanganate of potash solution to check fading; this it appeared to have done, although it had darkened the image con siderably. A conversation on fading then took place. J. B. B. Wellington showed two negatives of the same subject exposed two and ten seconds respectively; they were about equal in density and detail. The former was developed according to Col. Stuart Wortley’s plan, recently published, of commencing with a minimum of pyro ; the latter was treated with a normal developer for four minutes; the former, however, required twenty minutes to produce a like result. Deterioration of plates then became the subject of discussion, several members observing that plates of high sensitiveness appeared to be more difficult to keep in good condition now than formerly. Ualk in Studio. South London PHOTOCRAPHIC Society.—The first meeting after the recess will be held on Thursday next, Oct. 1, when, at the Society of Arts, E. Dunmore will read a paper entitled “The Troubles and Pitfalls of Out-door Photography,” and W. M. Ayres and other members will exhibit some novelties in apparatus. Hull Amateur Photographic SocIETY.—The Council of this Society invite the co-operation of amateur photographers to take part in a prize competition to be held in the month of February next, the exact date of which will be published in the photo graphic journals. All pictures to be taken in Great Britain or Ireland and adjacent islands. Entries close on the lath day of January, 1886. For further particulars, rules for competition, and entrance fees, application should be made to Mr. Stoakes, Hull Amateur P hotographic Scciety. Wltengate Hull. Fire in a Photographic Studio.—About two o’clock on the morning of Friday, the 18th inst., a fire broke out in a corrugated iron building used as a photographic studio, adjoining Upton Lodge, Victoria Road, Twickenham, the residence of Mr. Sage. The flames appear to have made great havoc in a short space of time, the whole building being wrecked, and a large number of negatives were destroyed. The origin of the fire is unknown, though Mr. Sage is inclined to attribute it to spon taneous combustion. Photography and Physiognomy.—The Pall Mall Reviewer, in a notice of Rosa Baughan’s “ Hand-Book of Physiognomy,” says :—“ Physiognomy may now be scientifically studied by means of composite photography, a process of which, as Miss Baughan makes no mention, she can hardly have grasped the importance, if she is even aware of its existence. But, after all, the method of visual observation is essentially that of composite photography, as is proved by our instant recognition of the types portrayed by it. Miss Baughan’s eye is perhaps not so dis passionate as Mr. Francis Galton’s camera; but it is an un commonly sharp eye. Some of her points are put with startling force. For example, she describes a certain forehead that denotes sweetness and sensitiveness of nature ; and adds that a woman with this sort of forehead could never be a shrew. REDUCTIVE Properties of Pyrogallic Acid.—Cazeneuve and Linossier introduced a boiled solution of ferrous sulphate, and a solution of pyrogallic acid in boiled water, into a tube filled with mercury. Air (with its oxygen) being thus excluded from the mixture, no colour was produced ; but the introduction of a little oxygen at once caused a blue colouration. The oxygen combined with the pyrogallic acid and the blue colouring matter is the product of the oxidised pyro acting upon the ferrous salt. Photographic Club.— The subject for discussion on Sept. 30th will be “ Sky Shades, and Shading the Lens during Exposure.’’ Saturday outing at Earlsfiield, trains leaving Waterloo Station at 1.50 and 2.50 p.m. Uo Oorrespondents. *.* We cannot undertake to return rejected communications. John Jackson.—It is probable that you do not wash your prints very thoroughly before putting thorn in the toning bath. Rev. Thos. Evans.—We have written to you, and will write again as soon as we have more information. C. F. W. S.—Thanks. E. de II.—1. Perhaps seven feet wide, seven feet high, and four teen feet long will suffice; if made larger, you will have some difficulty in doing as you propose. 2. Take protosulphate of iron 11 ounces, and dissolve this in 5 ounces of water. Then mix with it 11 ounces of nitrate of baryta dissolved in 15 ounces of water, filter from the dense white precipitate, and add twenty drops of nitric acid. 3. Any dealer in photographic materials can procure them for you. D. M. S.—As far as we know, the articles cannot be bought there, and you will have to arrange with European houses to send them out. W. F. Dixon.—1. Three ounces of carbonate of soda, and the same weight of carbonate of potash. 2. The difference is unimportant. Raynor S. Stephen.—In our volume for 1884 all details will bo found. See pages 13, 30, 44, 613, 691, 722, 750, 785, and 794. You can refer to it at our office. W. F. F.—1. Keep the sheets well compressed in a printing frame. 2. There have been several articles on the subject lately ; but we cannot tell you which one was referred to by our correspondent. Reader.—Order it from any dealer in photographic materials. J. J.—Mix the colour with white of egg, and, when dry, coagulate the albumen by moistening it with alcohol. J. G.—However small it may be, the liability is incurred ; but the law is rarely or never enforced when the apparatus is used for experimental purposes. Amateur.—1. A saturated solution of mercuric chloride. 2. The usual hyposulphite solution. A Reader.—The triplet is as suitable a lens for the work as you could employ. Wet the canvas by meansofa garden syringe; this will make it much more transparent. M. M. W.—1. It is quite easy to believe what you say, but there would be considerable difficulty in supposing the contrary. 2. Thanks. J. A. J.—Judging from your rough sketch, the instrument cither is, or has been, a quarter-plate portrait lens ; but it is impossible to form any opinion whether it still retains the original glasses. A London pawnbroker usually asks about half a sovereign for such a lens if it does not bear the name of a well-known optician. J. Hampton.—1. Carbonate of soda. 2. Carbonate of potash. 3. There is not any absolute necessity to wash, but it is advisable to do so. F. B. M.—The probability of being interfered with is very small, unless you photograph the fortifications, or make an obstruction in the streets ; but notwithstanding this, it is desirable to obtain a permit from the central police authorities, as this will command the assistance and countenance of all the subordinate officials. It is very desirable to bo provided with a passport. Thank you for the photographs. Uhe Ahotographic Hlews. SUBSCRIPTIONS. Including Postage to any part of the United Kingdom:— Yearly ... 15s. 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