The photographic news

• Bandzählung: 35.1891
• Erscheinungsdatum: 1891
• 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-id1780948042-189100009
• PURL: http://digital.slub-dresden.de/id1780948042-18910000
• OAI: oai:de:slub-dresden:db:id-1780948042-18910000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

difficulty was to get rid of air-bubbles. He had found that if a pool of water was left on the glass, and the print was placed in the pool, no air-bubbles would result. Mr. HERBERT Thompson said he could quite concur in Mr. Golding’s remarks on the simplicity of the working of the paper over ordinary silver paper. He did not recommend the use of chrome alum, but ordinary alum, as the former was liable to give a green colour to the whites. With regard to washing, he thought aristotype prints would require more than ordinary silver prints, as hypo, in his opinion, seemed to cling most tenaciously to gelatine. Mr. G. Luxton said the best way of thoroughly cleaning glass plates was to use the following : Photographic tripoli, methylated spirits, and water. The quantity of each could easily be ascertained. Mr. A. G. Golding said, with regard to air-bubbles, if after the print had been peeled from the glass it was found that air bubbles had been present, the print could be washed in water and squeegeed down on the glass again. GLENALNTOXD Photographic Club. At the fortnightly meeting, the president in the chair, it was decided that the photographs for the two competitions which the Club have now on hand should be sent in by July 11th. Mr. Craio initiated a discussion as to the position of the Club, and it was generally agreed that it manifested an increase of energy. The President then showed a new travelling lamp, and Mr. Johnstone an Eclipse hand-camera, after which the meeting became general to inspect some photographs produced by the president and Mr. Johnstone. Lowestoft and District Photographic Society. A meeting was held last Friday at the School of Science and Art, Regent Road, Mr. W. Stringfield presiding. After the election of members, several topics arose for dis cussion, among them that of development, and it seemed to be the general opinion that pyro and ammonia afforded the best results. Some few supported hydroquinone, but admitted that negatives produced thereby did not print so satisfactorily. Several prints and negatives were passed round for inspection, after which a few nice lantern slides, principally interiors, were shown. Cutting Glass Tubes, Bottles, etc.—Have some strips of thick blotting-paper at hand, from a quarter to half an inch in width, and of different lengths. Two pieces of such paper are wetted and wrapped around the bottle, tube, or other vessel to be cut, once or oftener (once is sufficient). These pieces of paper, cut true, are wrapped around the vessel like two bands. They must not be placed too close together—say from a quarter to three-eighths of an inch apart for larger vessels, and rather less than a quarter of an inch apart for tubes of ah inch in diameter. When this is arranged, a fine flame about two or three inches long is allowed to play on the glass hetween the two pieces of wet paper, the vessel being slowly revolved, and the point of the flame kept between the two papers. Within a minute, usually, the vessel separates with a clean cut along the line against which the flame played.—After Chern, and Drugg. Blue Prints.—In a communication to the Engineering News, Mr. F. H. Latimer states that he has found that adding oxalic acid to the ordinary blue print mixture materially lessened the necessary time of exposure. The solutions used were:—(1) Ammonio-citrate of iron, 120 grains ; water, 1 fluid ounce ; to which is added a few drops of strong ammonia solution till the odour is quite perceptible. (2) Potassium ferricyanide, 105 grains ; water, 1 fluid ounce. (3) Saturated solution of oxalic acid. Equal quantities of the first two solutions were mixed together, and to 10 parts of this mixture from 1 to 3 parts of the oxalic acid solution are added just before use, with the result that in cloudy weather the solution containing three parts of oxalic acid prints about ten times as quickly as the pure solution. For ordinary purposes, however, it is better not to add more than 20 per cent, of the oxalic acid solution, or difficulty will be found in getting the lines to wash white. Knsters to Corresponents. AU Communications, except advertisements, intended for publication, should be addressed to the Editor of the Paorographro Nxws, 5, Furnival Street, London, E.C. All Advertisements and communications relating to money matters, or to the sale of the paper, should be addressed to the Publishers of the Photographic News, Messrs. Piper & Carter, 5, Furnival Street, London. Questions requiring a reply in this column should be addressed to Mr. John Spiller, F.C S., 2, St. Mary’s Road, Canonbury, N. Photargus. —Cutting Soard. The rule to which you doubtless refer is that of taking the diagonals, and where they cross must be the exact centre of the glass. Another good plan would be to take and fold a piece of paper cut to the same dimensions as the glass ; then use this as a guide to bisect the plate. Mr. Alexander Cowan showed an ingenious cutting board many years ago at one of the technical meetings of the Photographic Society. Black Specks in Albumcnised Paper and Prints.—Without seeing them, it is so difficult to offer an authoritative opinion. They may arise from ultramarine or metallic particles in the paper, or accidental stains from minute traces of pyro, hypo, or other chemical impurity. The mere weighing out of pyro in the same room during warm weather has been known to produce a plentiful crop of black specks upon paper which was previously quite free from them. The brand you mention is one of those usually held to be thoroughly trustworthy. M. B.—Hand Camera Practice. There is no question about the several movements requiring to be frequently rehearsed as with any kind of manual drill, and you may as well do this with dummies or spoilt plates. Remember to close the sliding front before setting the instantaneous shutter, and adjust the focus as nearly as you can by estimating the dis tance. Provided the first plate is set fairly in the notch, there should be no possibility of fouling or jamming, as all the rest follow suit and drop down in succession. Shrewsbury.—Actinometers. Since writing to you last week, we found the description (occupying two pages, with explana tory drawings) in the Journal of the Society of Chemical Industry for May, 1890. It took the form of a communica tion to the Liverpool Section, and was read immediately after Messrs. Hurter and Driffield’s paper. The instrument is confessedly based upon Mr. Warnerke’s earlier luminous paint actinometer, but with sufficient difference in the mode of working to constitute a valid patent claim. Topo.—The Chromotypie Specimens. On Tuesday next, 30th inst., they will be taken down and returned to their owners. Meanwhile they can be seen, from 2 p.m. till dusk daily, at 50, Great Russell Street (third floor), on presenting your address card. G. J. F.—For Enamels. Either Mr. C. A. Rudowsky, 3, Guildhall Chambers, E.C. ; or Messrs. Sharpus, McCullum, and Co., Cockspur Street, Charing Cross. H. T.—The Proposed National Gallery of British Art. The terms of Mr. Henry Tate’s munificent offer will be found in the Society of Arts Journal exactly twelve months ago ; or in the Times of Saturday, 21st of June, 1890. L. E. (Southport).—Terms of Sale. Any good business ought to be cheap at the price of one year’s average takings ; but does this include a fair stock of apparatus and requisites ? At first blush it seems reasonable ; but one ought to take a professional opinion unless you know the locality well yourself. C. J. S.—Messrs. Morgan and Kidd offer to do the kind of work about which you are enquiring. See their catalogue, page 16. F. V.—Thanks for letter duly received. We hope to hear again from you shortly. A. W. W. and Co.—Answered by post, and further informa tion will follow as soon as procured. Emily.—Dark Room Lamp. A good plan is to use above the ruby light a yellow screen, kept covered during the progress of development, but, by raising a curtain in front, permits of examining the negative by its aid, when it is safe to do so.