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The photographic news
- Bandzählung
- 24.1880
- Erscheinungsdatum
- 1880
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- Englisch
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1146, August 20, 1880
- Digitalisat
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Zeitschrift
The photographic news
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Band 24.1880
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- Register Index 631
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Band
Band 24.1880
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408 THE PHOTOGRAPHIC NEWS. August 20, 1880 transforming a collodion print, developed and fixed, into chloride of silver, by means of perchloride of iron, then, after having washed it, placing it under strong pressure in contact with a plate of zinc. The silver will be found brought back to the metallic state, and a black image formed upon the surface of the zinc. The author thinks that in this fact lies a germ which in its application may be of considerable importance. Referring to the means of obtaining reversed negatives by methods recently suggested by Mr. Bolas and Mr. Brooks, M. PERROT called attention to Poitevin’s process published in 1859. M. Poitevin coated his plate with iodised collodion ; it was then sensitised, exposed for an instant to the light, and submitted to the iodine bath; he next exposed it in the camera, and after wards developed. He thus obtained a direct positive. It must be added that this method is only the application to collodion or gelatine of M. Bayard’s paper process, contemporary with Daguerre’s discovery. M. Bascher described his process of preparing gelatine bromide (see page 405.) M. DAVANNE showed a series of very fine prints, and remarked upon them. They were obtained from gelatino- bromide of silver plates, and taken by M. Jouet. The exposure of the plates varied from one to five seconds ; one second when the large diaphragm of a rapid rectilinear lens of 0-20m. focal length was used ; five seconds with the smallest diaphragm of a rectilinear lens of 0-30m. focal length ; showing that the same preparation may be used with equal success for landscapes, buildings, and instantaneous subjects. The developer was made in the proportion of four parts of oxalate of potash to one part of oxalate of iron, both used in almost saturated solutions. The plates were allowed to remain three minutes in the deve loper, and afterwards fixed in hyposulphite of soda, 20 per cent, solution, to which, at the moment of using, 5 per cent, of powdered alum was added. M. Janssen read a communication on the inversion of the photographic image by the prolongation of the luminous action. M. Joly made some remarks on the emulsification of bromide and iodide of silver, and exhibited some remarkable pictures. M. ANDRA made several observations on the preparation of gelatine plates. After some remarks by MM. Jonte, Clouzard, Martin, and Renard, the proceedings terminated. Ualk in the Studin. The British Association.—-The fiftieth annual meeting of this Association will commence at Swansea on the 25th instant. The president-elect is Mr. Andrew Crombie Ramsay, LL.D., F.R.S., V.P.G.S., Director-General of the Geological Survey of the United Kingdom and of the Museum of Practical Geology. The first general meeting will be held on the day named at 8 p.m., when Professor G. J. Allman will resign the chair, and the presi dent-elect will assume the presidency and deliver the inaugural address. On the 26th there will be a soiree, on the 27th a dis course by Professor W. Boyd Dawkins on “ Primeval Man,” on the 30th Mr. Francis Galton, M.A., will lecture on “Mental Imagery,” and on the afternoon of the 1st prox. the concluding meeting will be held. On the evening of the 28th (Saturday) Mr. Henry Seebohm, F.Z.S., will deliver a lecture to the operative classes on “ The North-East Passage.” There will be various excursions during the meeting to places of interest in the neighbourhood of Swansea. The sections will be as follows:— Mathematical and physical science (president, Professor W. Gry Us Adams) ; chemical science (Mr. Joseph Henry Gilbert, Ph.D., F.R.S. ; geology (Dr. H. Clifton Sorby); biology (Mr. A. C. L. Gunther, M.A.) ; geography (Lieut.-General Sir John Henry Lefroy, C.B.); economic science and statistics (Mr. Geo. Woodyatt Hastings, M.P.) ; and mechanical science (Mr. James Abernethy, V.P. Inst. C.E., F.R.S.E.). Fire by the Sun’s Rays.— Flames were discovered yester day afternoon in the centre of a drawing room in Norton Road, Cliftonville, and an investigation of the cause revealed the fact that a table had been set on fire in consequence of the cover becoming ignited by the sun’s rays, which had been concen trated through the medium of a decanter of water. Fortunately, the discovery was made before the fire had communicated itself to any other article of furniture in the room.—Daily Tcleyraph. Goxxesgondents. AU Communications connected with Advertisements and business to be addressed to Messrs. Piper and Carter, “Photographic Ne^vs ,, Ojfice, 5, Castle Street, Holborn, E.C. Advertisers are request'd to make all Cheques payable to Messrs. Piper and Carter, anderossed « Union Bank, Photographic News Account.” W. L.—You have doubtless received your picture by this time. W. N. and Sons.—Our Publishers will register for you on receipt of a copy of the photograph and the sum of eighteenpence. The law relating to copyright can be purchased from Eyre and Spottiswoode, Queen’s printers; the price, we believe, is four- pence. We thank you for letter. A Puzzled One.—The print of the panel or promenade measures 71 by 31 inches; we have found it popular in nearly all the principal studios we have visited lately. It is hardly worth while going into the question of priority in such a matter; it is scarcely important enough, and anyone seeking to make his claim good in a court of law would be beset with difficulties in numerable. If you have no direct sunlight you can work very well without blinds ; to get strong effects you must place the sitter tolerably near the glass, or allow clear light to shine upon him ; otherwise it is unnecessary. A. B. C.—We have no doubt it is the recent hot weather that has troubled you, either heating the solution or the film ; a little ice or a cooler locality would no doubt sot matters straight. A. Wrighton.—It was a stupid slip of the pen. Knight Errant.—Make them up in small parcels, and you will have no difficulty with the customs. Caddy tin or thick tinfoil. J. B.—It is without exception the most complete hand-book we have in this country. A Poor Photo.—The delay in the appearance of your letter was due to an anxiety on our part to add your description of shutter. Unfortunately, the sketch was a little rough, and we could not make our drawing clear enough. We should be glad if you would leave it as you mention, and thank you for the offer. You do not say the size of picture you desire; a maker would no doubt permit you to try an instrument before purchasing, and that would surely be your best plan of selection. They may bo dried in twenty-four hours, but the films often take longer; gelatine runs at about 90°, and any heat under this may be used; get as much ventilation as you can. Our advice is, do not add bichromate. C. Z. .F—The second paper you name is advertised in our columns nearly every week. The first has been out of the market some time. Crichton.—We do not think so. T. Bright.—1. To neutralise the acid in the chloride of gold. 2. The London Stereoscopic Company and the Van der Weyde studio, both of which arc in Regent Street. South Devon.—You did not, in all probability, wash sufficiently after fixing; this is indespensable. But when there is a deposit, this should not, witn care, cause stains. A. B. —We are sorry to say that the defect you complain of is ono inherent to the process ; all mercury-intensified negatives change in a measure with the action of light. At the same time, the examples you mention are very marked. We hope soon to publish a more improved method still of intensifying with silver. J. E.—We think the cause you mention is hardly likely to spoil the bath, although doubtless the solution might bo affected by the metal. Try coating with normal collodion, either using this asa varnish, or by dipping. Experiment.—The method, as you describe it, appears to possess many advantages; we shall be pleased to hear of your further experiments. , I Silver.—In our last Year-Book you will find instructions for working with collodio-chloride of silver. Beginn br.—Send us your prints ; we shall be very pleased to give you what assistance Iios in our power. S. G.—In our next; too late for this issue. A. B.—Thanks ; we quite agree with you. W. S. R.—You should not iiave attempted to take your picture in such bright sunshine; if well intensified, you might still get a pretty picture. W. W.—They must be quite dry before burnishing ; scratchings may be due to particles of dust. Pencil.—Wo are not sure, but if you try Newman, of Soho Square, he will doubtless tell you the best kind of brush to use. Harry B.—The specimens sent are too imperfect for us to decide where the fault lies. J. B.— With a transparency of your portrait, you can certainly get a very pretty picture for your magic lantern. Daw.—State what kind of portraiture you mean, whether large or small. ... A Constant Reader.—In our next; wo regret that your letter dd not come in time.
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