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

THE PHOTOGRAPHIC NEWS. [October 23, 1885. as evinced by the great difference in those which formed the apeaker’s first efforts, and one which had been oiled by the Company’s representative in London, the latter being remark ably transparent, and printing very beautifully. It had been literally boiled in castor oil for a few moments, at a temperature of about 280°. The Chairman considered it to be a great convenience to be able to use sheets or the roll of tissue, but should think it advisable to adopt the sheets at first for experimenting upon. One could not help thinking that for the use of amateurs glass plates were almost doomed as regards landscape work. Mr. Wright stated that he used the Platinotype Company’s sulpho-pyrogallol for development; the colour resulting was much better than when using Eastman’s formula. H. A. H. Daniel presumed that a most important point was to use a metal dish, and keep the oil really boiling when oiling. He was delighted to find that varnishing was unneces sary, as he considered the process of oiling far less disagreeable than varnishing. Mr. E. Brightman was quite prepared to find that, to ensure immunity from staining, it would be necessary to collodionize the film side. Mr. Wright suggested squeegeeing the negative on to a col- lodionized plate when drying, so that when lifting it, it would be already collodionized. Mr. Stephens thought it a great advantage to be able to use sheets instead of the roller, if desired. Mr. Daniel thought it was not one of the least of its advant ages to be able to wash the negatives in the same apparatus as the prints. After some further discussion (during which very few could state which prints exhibited were from the glass, and which from the paper negatives), a vote of thanks was accorded to Mr. Brightman. Ualh in te Studio. Photographic Society of Great Britain.—The next monthly technical meeting of this Society will take place on Tuesday next, October 27th, at 8 p.m., in the Exhibition Gallery, 5, Pall Mall East, when the apparatus and appliances now on the table will be explained by the exhibitors. Also on Monday evening next (optical lantern night) transparencies will be shown, produced by members of the Amateur Field Club. The Identiscope.—Mr. F. H. Carter writes to combat the assertion made by Mr. Mathews at the close of the communica tion from him which appeared in our last issue, to the effect that the identiscope afforded “ irrefutable evidence ” that the Tich- borne Claimant is the true and original Tichborne. Mr. Carter suggests that if the identiscope “proves” that which an accu. mulation of facts—such as the absence of tattoo marks where they had been known to exist—disproves, the obvious inference is that the instrument itself is untrustworthy. Our corres pondent adduces other arguments against Mr. Mathews’ proposi tion, but, as he remarks, the columns of the Photographic News are not intended for the discussion of such matters, and there fore we cannot afford space for disputation on the question. Photography applied to Topography.—At a recent meet ing of the Academy of Sciences, Captain Masssard exhibited a photographic apparatus adapted to topographical purposes. It enables panoramic views to be taken, which, completed by some simple topographical work, provide a representation of a district on a map. The obstacles to obtaining panoramic views, owing to the necessity of emptying glass plates and several of them, have been met by Captain Mssard's cylindrograph, which is not bulky, and very light. The sensitive plates are necessarily of a flexible substance, carried by a curved frame. The positive proofs can be arranged in a cylindrical frame, and so viewed as to present a panoramic view. This contrivance is called a cyliadroscope.—Seience Jlontldy. Abstract of Chapman Jones’ Lecture at the Birkbeck Institute, October 21st.—J. H. Schulze, in the year 1727, copied writings by sunshine on a surface of chalk moistened with nitrate of silver, and Lord Brougham, in 1796, used ivory instead of chalk, and got pictures by using a dark chamber with a hole in it. The Royal Society refused to publish Lord Brougham’s observation, and maintained its short-sighted policy towards photography by turning a deaf ear to Niepce in 1827, thus driving him and the subsequent Daguerreotype discovery to the French Academy, The son of the great Wedgwood, in co-operation with Humphrey Davy, got photographic pictures in silver salts in 1802, but could not fix them. Hyposulphites date from 1819. We do not know what light is, but suppose it to be due to the undu lations of “luminiferous ether,” a substance whose properties can be neither imagined nor described. White light may be divided into coloured lights by various means. Light causes fading or bleaching, besides producing the darkening of certain compounds ; it also rots or destroys, as well as causing the pro duction of the green colouring matter of plants and other com pounds. It is blue and violet light that is chiefly thus chemically active. Photographic Club.—The subject for discussion on October 28th will be “ Local Intensification and Reduction.'' Uo Correspondents *,* We cannot undertake to return rejected communications. Pharmacy.—Most of the formula! used in toning will give a purple black if the action be continued long enough. There are, however, certain conditions necessary; the printing must be carried to a depth which is only admissible with a rich, powerful negative; from a thin, poor, or fogged plate, a rich black print is not to be expected. Try the formula with chloride of lime given in the Year-Book. William Goode.—It is not only possible, but very common, to produce lantern slides from negatives of a larger size. A copying camera is employed—that is, one which has fittings to hold the negative at one end, and the focussing screen at the other, with the lens between. Wet collodion is generally employed, but emulsion plates may be used ; but they should be of a kind giving perfectly clear shadows and good range of tone. These characteristics are more frequently to be met with in slow plates than in rapid ones. W. Goode.—Very great over-exposure commonly produces a re versed image ; so, to a certain extent, will great under-exposure when the film is affected strongly with green fog, and this is developed sufficiently to overpower the image produced by light. J. E. Forrest.—Medium for retouching is generally applied after varnishing. Rub it with a soft rag, but not sufficiently hard to remove the whole of the solution from the varnished surface. J. W.—Forfar is a better material for painting backgrounds upon than calico or sheeting, being stronger; but it is difficult to pro cure it more than 72 inches wide. Bed-tick can bo obtained of 86 inches ; perhaps that will answer your purpose. T. B. H.—The brass fittings for cimeras are specially made in a department of the camera maker’s workshop, or sent out to some brass finisher to make to order. We arc not aware of any factory specially for their manufacture, but certain parts—nuts and screws, certainly—can be obtained of some of the dealers in apparatus. Constant Subscriber. — Liesegang’s “Handbook of Photo graphy” is not, so far as we kuow, published in English. The latest German edition is well brought up to date, E. Ernest Bilbrough.—The subject of rendering paper trans parent is receiving considerable attention just now, and various methods, old and new, will be put upon their trial. Harry Pointer.—The hanging committee undoubtedly possess the right you refer to. Unless the space at their command were unlimited, they must of necessity exercise that right. W. J. Anckorn.—We do not profess to answer legal questions; but it appears to us that in adopting the wording you send us, you are within your right. Litho.—Detailed instructions for collotype and photo-litho print ing have been published in the Photografhic News, and we cannot, in the limits of this column, repeat them. Walter H. Cox.—We have forwarded your offer to the gentleman named. J. McL.—Some of the paper enamellers, whose addresses are to be found in the London Directory, will probably be able to supply what you require. J. C. O’L.—We believe the firm has changed proprietorship, and is now carried on under another title. . , J. J. Harrington.—It is undesirable to keep ready sensitised paper so long as for it to become discoloured ; but we do not see that this proceeding is likely to induce subsequent fading, which is probably due to some cause that you have not traced. 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