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The photographic news
- Bandzählung
- 29.1885
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- 1885
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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. 1406, August 14, 1885
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The photographic news
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Band 29.1885
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- Register Index III
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528 THE PHOTOGRAPHIC NEWS. LAvaUsT 14, 1885. Ualk in the Studio Uo Uorrespondents 3s. lOd 4s. 4d *,* We cannot undertake to return rejected communications. ONE in Need of Help.—1. The process is not very suitable for the purpose, as very prolonged exposures would be required; but perhaps you will not consider this a serious objection. 2. See the article by Ashman and Offord, which will shortly appear in our paper. Duffer.—1 and 2. Citric acid should be tried first, boginning with equal parts of a saturated solution and water. If there is a tendency to frill, replace the water by a solution of alum. Should the stains not disappear, you may venture on the use of dilute sulphuric acid, gradually increasing the strength, if necessary, to one of acid, and perhaps five or six of water. Remember that when sulphuric acid and water are mixed, heat is produced, and the mixture must not be used until cold. The remark abwut replacing the water (whole or part) by alum solution also applies in the case of the sulphuric acid. You may also try the prepara tion recommended under answer No. 4. 3. It is not correct; y u must have made some mistake, 4. No, perfectly satisfac- tory; but in some cases improvement has resulted by a second treatment with the fixing bath, followed by a thorough washing, and final treatment with the following : — Saturated solution of alum ... 1 pint Nitric acid 1 ounce A. Z.—Probably they arise from traces of grease in the gelatine; this is generally on the surface of the flakes, and is very unequally distributed. C. H. E.—The case is a difficult one, and we have sometimes found it better to go through the whole series of operations again, wash ing thoroughly after each stage. This will, of course, make the negative very dense, but you must either put up with this, or make a lighter negative by copying. CAPT. Montague.—On the contrary, it is a very bad plan, and for this reason it is not in use: If you require further information, we shall be pleased to furnish it. Spencer Nichole.—“Glycerol” is merely another name for glycerine. EsBw Vale.—The general arrangement seems to us to be excellent, and you are certainly well advised in making such good provision for warming the studio. We would, however, suggest bringing the fire-places of dark room and studio a little ne rer to the door. When you consider the proximity of the fire to the table on the one hand, and the backgrounds on the other hand, the reason of our suggeSlion will be obvious. The additional door into the studio should bo at the end of the main pa-sage, and exactly opposite the front door ; and this would be of much value as re lieving the traffic through your laboratry and dark room. Suppose, for example, that you wish to bring a number of heavy and bulky articles in from the street to serve as “ properties,” and consider the advantage of a direct road, rather than one with two bends. As a general thing, this door would doubtless be k ept closed and bolted. The whole could be built for £400 in the n eigbbourhood of London, and should cost lees in your District. Amateur.—You cannot do it afterwards without damaging the gloss. Still, you can always soak them in water, and re-enamel. partly negative ; in the latter it was wholly positive. A por tion of the fog was also removed by the fumes of cyanide. He then showed a positive made with renovated emulsion, also referred to last week; treated with ferrid-cyanide the red colour was destroyed, but an opalescence remained. Mr. Hender son also showed samples of Eastman’s new films, and a trans parent material made by Walter Woodbury, and coated by himself. The following question was then read : " Is it a recognized fact that all go-and return shutters convey an impulse to the camera ? The general opinion was that go-and return shutters produce a jerk more or less according to the construction. facture— or rather the refining—of nitrate of soda. The forms of apparatus constructed by Messrs. Harvey and North in 1881 are employed for the preparation of the sulphite of soda which is used to precipitate the iodine from these liquors, and after wards distilling it. The sulphite of soda is obtained by saturating a solution of soda with sulphurous acid gas. The soda for this purpose is prepared on the spot by furnacing an intimate mixture of nitrate of soda and coal-dust.—Burgoyne's Magazine. Photographic Club.—The subject for discussion on August 19th will be “On Sulphite in the Developer, with Experiments." Saturday out-door meeting at Hampstead Heath; meet at railway station at 2.30. Paraffine Stoppers.—M. Chanteaud, the well-known French pharmacist, long ago introduced the use of pure paraffine over the corks used to close the little tubes which contain the dosi metric granules. These corks being of the finest quality, and well impregnated with paraffine, inwardly and outwardly, the contents of the tubes are practically air-tight, and are made so again when corked after opening. This has the effect of thoroughly preserving the medicament for an indefinite period of time. The active substance being, moreover, covered with a thin layer of lactose, when once the granules are placed in the tubes, neither light, air, nor moisture, can possibly affect them, and the alkaloids and their salts can be thus preserved from decomposition for a number of years. Since then, Mr. Kirster, a German pharmacist, has recommended, in the Bharmaeeutitche Zeitung, the use of paraffine in place of corks or other stoppers, for the hermetic sealing of bottles containing liquids which are prone to ferment or otherwise deteriorate by coming in contaot with the air. This, he says, is particularly applicable to syrups or saccharine juices of all kinds. They are poured, while hot, into perfectly dry bottles, which are filled nearly up to the lip. They are then allowed to stand at rest until cold, during which time all air bubbles will rise to the surface. Finally, a small quantity of melted paraffine is poured over the top, when it forms a firm solid coat on cooling, about the tenth of an inch thick. Such a paraffine stopper is easily removed when the contents of the bottle are required for use, and by collecting the paraffine it can be used again. But the paraffine cork of M. Onanteaud appears preferable, since the same bottle can be opened and closed several times without the trouble of re-melting the paraffine.—Burgoyne's Magazine. Measurement of the Intensity of the Sun’s Rats.—M. Morize, of Rio Janeiro, has applied selenium to the measurement of the solar rays at different hours of the day. It consists of a cylinder composed of discs of copper separated by leaves of mica, and connected electrically at their edges by selenium. It is insulated on a glass support, and is fixed so that its axle is parallel to that of the earth. Under these conditions, the rays of the sun strike it approximately at the same angle throughout the day. It is interposed in a circuit of constant force, along with a galvanometer, the variations of which show those of the intensity of the solar rays.—Cosmos. Uhe Ahotographit News. SUBSCRIPTIONS. Including Postage to any part of the United Kingdom Yearly ... 15s. Od | Half-Yearly ... 7s. 8d. 1 Quarterly ... To the United States, the Continent, and the Colonies: Yearly ... 17s. 4d. I Half-Yearly ... 8s. 8d. ] Quarterly ... To India (Yearly) 19s. 6d. New Method of Filtering.—The filtration of turbid liquids sometimes presents great difficulties and no little annoyance. These liquids, which are difficult of clear filtration, may, I according to Mr. Pape, be treated by a novel method, which I will be found to have the desired effect. No play is intended on I the author s name, but he tells us it should be called the « Pape- method.” In fact, turbid liquids may, in most cases, be readily I and cheaply filtered by beating into pap about half the. quantity of the paper which would usually be required for filtering the same quantity of liquid, and running this pap into the filtering funnels, the stems of which have been previously fitted with small plugs of cotton wool, care being taken that the latter is quite free from fatty matters. Such is the medicated cotton wool supplied for surgical purposes. The funnel is, therefore, closed at its lower end with this pure cotton-wool, over this is placed the more or less fluid or pasty paper pulp, and over this again the ordinary conical filter paper Burgoyne's Magazine. Peruvian Iodine.—According to an article which has re cently appeared in the French periodical, Le Genie Civil, about 3,000 lbs. weight of iodine are produced monthly at the works of Peruana, in the province of Tarapaca (Peru). This iodine is obtained from the mother-liquors which result from the manu- ADVERTISEMENTS IN COLUMN. Not exceeding Five Lines (3G words)... 3s. Od. Each Additional Lino Os. 4d. Repeated insertions, and special positions or style, by contract.
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