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

July 17, 1891.] THE PHOTOGRAPHIC NEWS. 519 Went Intelligence, Applications for Letters Patent. 11,434. David Allan, 157, Whitfield Street, St. Pancras, London, “Improvements in Portable Photographic Dark Room Developing Lamps.”—July 6th. 11,575. James Philip Ottaway, 53, Chancery Lane, London, “ An Improvement in Axle Caps for Vehicles.”—July 7th. 11,578. Charles Henry Guest, 45, Tower Road, Birmingham, “ An Improvement in Roll-Holders for Photographic Cameras.”—July 8th. 11,588. Marquis Bibbero, Royal Polytechnic, Blackpool, Lancashire, ‘ ‘ An Improvement in a Lantern for the Repro duction of Opaque Substances.”—July 8th. 11,728. Walter Edmund KERSLAKE and Peter White John son, 26, Castle Street, Liverpool, “ Improvements in Apparatus for Changing Sensitised Plates for Photographic Cameras.”—July 9th. 11,783. Marshall Arthur Weir, Fairview, Spring Grove, Kingston-on-Thames, “ Improved Means for Backing Photo graphic Plates and Films.”—July 11th, 1891. Specifications Published. 1,388. January 27th, 1890.—“Exposure Calculator.” A. Watkins, Imperial Flour Mills, Hereford. This consists of an apparatus on the principle of the slide rule for calculating the tim of exposure to be given to a photographic plate. The time is calculated by multiplying together four factors, representing the actinic force of the light, A, the sensitiveness of the plate, P, the colour of the object and its distance from the lens, S, and the relation of the diaphragm of the lens to its focal length, D. For multiplying these factors six rings, g, h, i, j, k, I, are fitted on a tube, a, the outer rings, y and I, being fixed to the ring, while the other four can be rotated upon it. The ring g is marked with a scale for A, the ring h for P, the ring i for S, the ringi for D, the I with a scale of seconds for time of exposure, or result of the calculation. Inside the tube is fixed an actinometer, consisting of a strip of sensitive paper, which is exposed till it attains a standard tint for determining the value of A. The time for the apparatus is measured by a pendulum consisting of the cap of tube suspended by a chain. In a modified form discs are used instead of rings. 1,394. January 27th, 1890.—“ Levels for Cameras, &c.” G. J. Heaton, 2, Coburg Villas, Albert Road, Windsor. Within a metal pillar, preferably square in section, is fitted a glass tube, a fixed rod, and a movable rod, which latter is suspended by a fibre of silk, &c. When the instrument is in a true vertical position, the two rods are in line. In a modification which is adapted for use in connection with photo graphic cameras, the glass tube is fitted with cups at the top and bottom, which are secured to a backing which is attached to the swing-back of the camera. 1,412. January 27 th, 1890.—“Lamps.” T. Bergmann, Eisen- werke Gaggenau, Gaggenau, Germany. Gas Lamps, Incandescent.—The heating power of the flame is increased by supplying oxygen through a pipe to the centre of the gas-burner. Incandescent material is supported between two jaws, and can be adjusted relatively to the burner by a rack-and-pinion. Several of the burners may be used to form a cluster. Gas-Cocks.—The cock has two passages for the passage of the gas and oxygen respectively. The relative proportions of the gas and oxygen supplies can be regulated by set screws. 1,715. February 1st, 1890.—“Film-changing Apparatus." M. A. Wier, 9, Strand, London. The camera may or may not be of the detective type, and is fitted with a film-changing apparatus in the rear part of the dark chamber. One form of this apparatus is shown. The films, which are furnished with backings of non-actinic paper attached to one edge, or separate backings of cardboard, are contained in a box. After exposure, the front film is raised by a frame till the upper edge is caught between a band and roller, and is carried round and deposited at the back of box as the band is wound off the spring roller on to another roller. The plates are pressed forward into focus by a screw, and the exposed plates are separated from the unexposed by a movable partition. When a separate opaque backing is used between the films, it may be used as a focussing screen before it is transferred to the back. Several modified forms of the change- I box are described. Two rollers may be employed to increase the distance the plate is carried back, and the frame and push may be worked automatically from the transferring mechanism of separately by hand as in the case described. 1,791. February 3rd, 1890.—“Advertising and Magic Lan terns.” A. Champness, 1, Stockfield Road, Tulse Hill, Surrey. Advertisements are reflected on water, such as the sea, streams, &c., or on vapour, or the clouds, by a magic lantern as represented. Stencil slides may be used. 2,023. February 7th, 1890.—“ Photographic Camera for Enlarging.” W. Griffiths, Highgate Square, Birmingham. Enlarging.—The body of the enlarging camera is made of metal, millboard, or other suitable material. A frame for carrying the negative fits telescopically in one end of the camera box ; in the other end is fitted a dark slide having a plate of clear glass fitted in it to support the sensitive plate or film, and also for focussing purposes. The focussing screen is formed by pressing a piece of ground glass against the surface of the clear glass, this, after focussing, being removed for the insertion of the sensitive plate or film. The enlarging lens is fitted in a central frame or partition which, for focussing purposes, is fitted so as to slide telescopically in the camera box. 2,034. February 7th, 1890.—“ Combined Tripod and Walking Stick.” A. G. Rider, 11, Jewry Street, Winchester, Hants. Each leg of the tripod is cut through for about one-third of its length, so that it can spring open to fit on the tripod top. The lower third of the leg is made to turn on a pivot, so that it can be extended or folded up. When the pivoted section is extended, it is held in position by a notch on one end, which is slipped on to a fixed stud. When the legs are folded up and fitted with ferrules, they form a walking stick. Aroceedngs of Socetes. HOLBORN Camera. Club. At last Friday’s meeting of the Holborn Camera Club, Mr. T. O. Dear in the chair, Mr. E. Clifton gave a few hints on the method of finishing the negative. He had found that amateurs took a great deal more trouble in developing their negatives than professionals, but in fixing and washing they reduced the careful developing to nil. While the print was in the fixing bath they would look at it every now and again and admire ; the air, acting upon the silver, caused the film to turn a sickly yellow, and the result was flat negatives. Speaking of the final washing, he said a negative not thoroughly washed was very liable to damp, to say nothing of fading and kindred evils. He finished his hints by some remarks on reducing and intensifying. An interesting discussion followed, chiefly on reducing and packing of exposed plates on a tour. North Middlesex Photographic Society. July 13th.—Mr. H. Smith in the chair. This being the opening night of the new session, the meeting partook some what of the nature of a conversazione. Objects of interest were passed round for inspection. The new pattern Thornton- Pickard and the automatic time and instantaneous shutters were shown and thoroughly discussed. Cameras were shown by Mr. Braine and Mr. Gill. An ingenious printing frame to be used in combination printing, or for making lantern slides by con tact from selected portions of a larger negative, was shown by the president. The usual competition of views taken at the Society’s field- days was then held ; Mr. H. Smith received the vote of merit for views taken at Endfield and High Beech, and printed on "Celerotype"paper, Q *