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The photographic news
- Bandzählung
- 12.1868
- Erscheinungsdatum
- 1868
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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. 488, January 10, 1868
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Zeitschrift
The photographic news
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Band
Band 12.1868
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- Titelblatt Titelblatt I
- Kapitel Preface III
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- Register The Index To Volume XII 619
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Band
Band 12.1868
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January 10, 1868.] THE PHOTOGRAPHIC NEWS. 23 Proceedings of Sucieties. North London Photographic Association. Tub usual Monthly Meeting was hold on the evening of Wed nesday, the 1st inst., in Myddelton Hall, Mr. W. W. King in the chair. The minutes of a former meeting having boon road and confirmed, Mr. E. Dunmore read a paper on Some Art Aspects of Photography (see p. 19). After a vote of thanks, it was resolved, as the meeting was small, to adjourn the discussion on the paper until the February meeting. Currespondence, CARBON PRINTING. Sir,—After my season’s work, which, I am happy to say, puts me out of the position of joining in the dolorous chorus which is being pretty generally sung by the profes sion of late (the more is the pity), I took a week’s holiday to myself for the purpose of seeing what was doing away from home, determined to bag every wrinkle that could be turned to good account in future practice. I have long desired to try my hand at carbon printing, but, I dare say, like many more, was deterred from doing so by the conflicting statements made regarding its practica bility. So, when out for my week, I one day turned my steps towards Newcastle, and called on Mr. Swan, and, sir, if he were a stranger to you, I would tell you of the kind and gentlemanly manner in which I was received ; my only let ters of introduction being a few cartes, the backs telling where I did them, and the other side showing how. He kindly requested me to accompany him to the printing establishment, and there I saw the process gone through with pictures of every size, from cartes up to whole sheets, and in every variety of tone suitable to the subject, from pure black to a warm brown, all equal, so far as I could judge, to what silver prints would be from the same negatives, and as regards uniformity in depth of printing superior. I was so thoroughly satisfied with what I saw that I resolved that my first work on my return homo would be a trial at carbon printing, and the few cartes I enclose will give you an idea of my success. I find the working of it so simple and certain that I would have no hesitation in adopting it for all my work ; and consider that Mr. Swan is justly entitled to substantial remuneration for the skill, painstaking perseverance, and time he must have expended in bringing the process to such perfection. I noticed lately that Dr. Vogel suggested the use of the screw press for transferring —a good idea—but, I think, only suitable for the first transfer. Where quantities were done the screw press would be valuable, as the undeveloped prints could be neatly laid on the caoutchouc-coated paper (an uncut sheet, it the press was large enough), and piled into the press between sheet-brass or printers’ pressing-boards, when one squeeze would do for hundreds of prints. The re transfer requires a much sharper nip to ensure perfect adhesion, and for this a copper-plate or lithographic press is better adapted. John Henderson. Perth, Jan. ^th, 1868. [The prints which Mr. Henderson encloses are excellent. The question of screw pressure versus rolling pressure can only be decided by experience. Mr. Cherrill, who first proposed it, has succeeded very well with the screw press, and Dr. Vogel confirms his view. Our own predilection, theoretically, is in favour of rolling pressure, with which we have succeeded. As yet, however, we have not tried the screw pressure.—Ed.] SUGAR IN THE PRINTING BATH.—INDIA- RUBBER MOUNTING. Dear Sir,—I beg to thank you and Mr. Bovey for the hint as to the use of sugar in the printing bath. I tried it some weeks ago, when you first mentioned the subject, and, as no formula was given, I added one drachm of sugar to each pint of a 40-grain silver bath. I have, within the last few days, obtained prints with perfectly pure whites, on paper which has been excited three weeks. I fancy that the paper is a little more sensitive after this treatment, but of this I cannot speak with certainty, as I have not tried a sample prepared with and without the sugar side by side. I have been trying the india-rubber mounting, but without much success. I made a 20-grain solution in benzole. It took some days to dissolve properly, but appeared all right at last. I then mounted some cards, as I thought with success, and after rolling they looked very nice. To my dis gust, however, when I looked at them some hours after, the heat of a warm room had made most of them curl up from the mount at the corners, and in some, half the prints were off. Is there any remedy for this ?—I am, sir, gratefully yours, Probatum Est. [The tendency in the print to leave the mount is a common result of using too thin a solution of india-rubber. A very attenuated layer is comparatively useless. In using glue or paste it is a maxim to apply the thinnest coating possible. 'A carpenter will tell you that the best joint is made with the smallest quantity of glue, and he will sometimes rub two surfaces together to press out all superfluous glue. But it is to bo observed he uses the smallest quantity possible of glue of the riijht thickness, not glue made as thin as possible. It is possible to make glue and paste too thin to secure adhesion. But the conditions in using india-rubber are altogether different. It does not dry into a hard substance binding the two surfaces to which it adheres. It continues in the form of an elastic gum. a thin layer of which readily yields to a strain which is greater than its own elasticity. It is necessary, therefore, that the layer should be thick enongh to resist any possible tension to which it may bo subjected. A 20-grain solution ought to be strong enough, but it has probably been spread thin.—Ed.] EXPLANATION. Sir,—We shall be obliged if you will kindly allow us space in the News to declare that we have nothing to do with “A. B.,” who in your last advertises cheap printing, and refers to Mr. Seeley, of Ware. We think that surely competition in price has reduced photography as profession too low already ! The effort should rather be to raise both price and qnality. A. and E. SESLEY. The Ferns, Richmond Hill, Jan. Sth, 1868. Ulk in the Studio. The Meeting of the Photographic Society.—At the next mooting of the Society, to bo held on Tuesday evening, in Conduit Street, Mr. J. Spiller, F.C.S., will read a paper, en titled, “ Researches on the Hyposulphites and other Fixing Agents. Part I.” Wo hope that a good attendance will be ■present to hear a paper on such an interesting subject. Gun-Cotton and Nitro-Glycerine.—Professor Doremus, at a recent inquest held in the United States on the bodies of several men killed by a nitro-glycerine explosion, stated that if gun-cotton be immersed in the proto-chloride of iron it turns into common cotton ; the same experiment was tried with nitro glycerine by mixing it with proto-chloride of iron, and it reverted into common glycerine. If gun-cotton or nitro glycerine is not carefully washed to get rid of the acid, a gradual decomposition will ensue, producing gases which, if the vessel bo closed, will explode. Nitro-glycerine carried
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