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The photographic news
- Bandzählung
- 24.1880
- Erscheinungsdatum
- 1880
- Sprache
- Englisch
- Signatur
- F 135
- Vorlage
- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1126, April 2, 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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168 THE PHOTOGRAPHIC NEWS. [APRIL 2, 1880. I think the story may well be classed with those other ridiculous ones which you may have seen about the por traits of persons impressed on glass by a flash of lighting. I once saw a rusty piece of glass which a deluded or a dis honest showman was trying to palm oft upon his audience as produced in this manner.—Yours truly, Thomas GAFFIELD. PREPARATION OF DRY PLATES. Sir,—I have looked in vain in my News and Year- Book for a sketch of a drying cupboard. I wish to make my own dry plates up to fifteen by twelve ; would you or some of your readers give me a slight insight how to make one? I think there are more than myself who would be thankful for it.—Yours, &c., Pyro. Ualk III theStndio. PHOTOGRAPIIC Society of Great Britain.—The next meeting of this Society will take place on Tuesday, April 6th, at the Gallery, 5, Pall Mall East, when a paper “ On the Optics involved in the Construction of the Magic Lantern ; and on a New Lantern-Lens or Objective,” will be read by Mr. J. H. Dallmeyer, F.R.A.S. Photographic Action.—Heath v. Jones.—In this case the defendant was called upon to show cause, under a judgment summons obtained against him at the instance of Mr. Vernon Heath, a photographer of Piccadilly, why he should not pay the plaintiff the sum of £5 odd for work and labour done, as stated in the particulars before the Court. The merits of the case having been gone into on the former hearing of the case, Mr. Heath said that the judgment summons was served personally on the defendant. In reply to the learned Judge as to the defendant’s means, Mr. Heath said that the defendant resided in good style at Bolton Street, Mayfair, and was proprietor or part proprietor of race-horses, and a member of the Army and Navy Club, and was in a position to pay the debt. The plaintiff said he did not know the defendant’s Christian name ; he only knew him as Captain Jones, and as there was no other Jones living at Bolton Street, he had no doubt the defendant was properly served. Upon hearing this evidence, his Honour gave judgment in favour of the plaintiff for the full amount claimed, with costs, and ordered a warrant for the defendant’s commitment to prison for twelve days, unless debt and costs were paid. The warrant to be suspended a fortnight. G0 Goxresgondens. George SILARPE:—Yes, you may use them wot, but there is no advantage gained. 2. The Platinotype Company will supply you. Write to them. J. East.—We do not, as a rule, give such opinions, hut we have made an exception in your case. The wall-paper you send certainly does contain arsenic. Take a clean test-tube and put in it a slip of your paper with some hydrochloric acid; boil, and then pour the acid into another tube and put in some pure copper turnings. You will find a black deposit upon the copper after warming again ; this is evidence of the presence of arsenic. But you must be quite sure that your copper is pure. You can now test other samples for yourself. J. J.—It is not so easy to dissolve india-rubber in benzole. Get some masticated rubber—that, is rubber whose fibre has been thoroughly broken up—and try again. Ordinary rubber will only swell like gelatine in cold water, but will not dissolve. Warming will facilitate the solution, but be very careful, for benzole is highly inflammable. Micro.—It is a collotype print—that is, an impression printed off from a colloid film such as gelatine. Photo-typie—ov, at any rate, photo-type—is a misnomer ; the typographic press' has certainly not been used in its production. See our " At Home” this week. Silver Printer.—Smell is not a criterion of its quality; there is, no doubt, a large quantity of questionable albumenised paper in the market; and much of if, in all probability, comes from abroad; but smell, we repeat, is not, from a chemical point of view, a sign of inferiority. L. L.—We can only refer you to our advertising columns. We have correspondents in Berlin, but we could not trouble them about the qualifications of an assistant, unless he especially referred to some well-known names. Germans are very apt retouchers, but because ho is a German, it does not follow that he knows his business. Glass.—We only know one studio built with blue-tinted glass, and that is at Vienna. Ground glass is more generally used than before. Messrs. W. and D. Downey are building a ground glass studio. Blanchard secures the same softness of illumination by employing screens of papier mineral, which can be had of Marion and other dealers. Tyro.—Certainly not, if you register at Stationers’ Hall; fee one shilling. Lal.—No, not in London. There will bo an annual exhibition as usual at Pall Mall this Autumn ; but the date has not yet been fixed. J. Morgan.—If you like to send it to us, we will do what we can. Mount.—You can easily find out whether it is starch or not. Make a solution of iodine, by adding a few crystals of this material to an aqueous solution of iodide of potassium. I f there is the slightest trace of starch present, the iodine solution will turn it blue. Strerhon.—Nut-gall solution and sulphate of iron will certainly make writing ink, but probably not so good as you could buy at a stationer’s. Calendar.—Wash the linen in warm distilled water to remove any dressing; when dry, the fabric is stretched and mangled, to render it smooth, and albumenized with a mixture of— Chloride of ammonia 2 grains Water ... ... 250 c.c. White of two eggs. The silver bath should be rather strong, about seventy grains to the ounce of water. The fabric is floated for five or six minutes, and when dry is easily manipulated in the printing-frame. It must be rather over-printed, as it loses much in toning, and it should be toned and fixed as soon as possible ; the whites of the picture are not fully restored till the print has been fixed. The operations of sensitizing, printing, toning, and fixing should be all carried out in one day. W. Norman.—Write to Messrs. John Berger Spence and Co., 31, Lombard Street; they will give you all the information you want on the subject of Spence’s metal. Biblax.—Any good sample of gelatine, such as Nelson’s, will do. Gelatine will swell very much in an atmosphere impregnated with moisture, or you may immerse in cold, water, when it will also swell without dissolving ; you may immerse for several hours. Probably you will find a five percent, bichromate solution answer your purpose. Debutant.—We will enquire, and doubtless shall be able to get you the information by next week. A Young Hand.—We should think tho spots were due to the paper itself, unless, when sensitized and wet, you allow dust to settle. Try another fresh clean sample on tho same bath; if they still appear, it is tho paper, most likely, in fault. R. Gordon.—Of course, if you reduce your water, that is equi valent to making your solution stronger. Add a little more oxalate, and you will, no doubt, improve matters. We shall publish, in an early number, a paper on the subject by Dr. Eder, which will give you much information on this point. Puzzled.—The intensifier you employ has answered in our hands, but, unfortunately, commercial dry plates are differently prepared by different makers. As you employ Wratten’s plates, ‘you might do well to follow the advice Mr. Tulley gives in the News for the 2nd January ; it is practical and effective. Thos. Gaffield.—Thank you for your communication. W. H. P.—Liquor ammonia diluted will do very well, and you may soak in the solution as you suggest; take care, however, that your wash-leather is free from French chalk, &c. Glass that has been used over and over again certainly requires more severe treatment, but if the old film leaves readily, ammonia, a little stronger than usual, will do.. Captain Tukton.—The film you send is certainly gelatine, and not collodion. Other answers next week. Amateur.—A wax or oil coating of some kind should be applied first of all, and then there is no difficulty about getting your picture properly developed. Any solution of wax will do—turpen tine, ether, or benzole. You could easily scrub the film off again if unsuccessful, if you don’t varnish it. W. Barrington.—We can find no fault with the formula you send, and it ought to be successful. Plates polished with talc should answer the purpose. Try more wax, and when you get film to peal, reduce it again. A. B. J.—Hydrated oxide of potassium or caustic potash is probably what is meant, and the manufacturer of this, you will find in any handbook on arts and manufactures. At present there seems little prospect of doing away with ammonia in alkaline development. _ W.— Thank you for your com munication, but wo think spectroscopic science has advanced more than you imagine of late.
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