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The photographic news
- Bandzählung
- 12.1868
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- 1868
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 499, March 27, 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 12.1868
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March 27, 1868.] THE PHOTOGRAPHIC NEWS. 155 light of twelve sperm candles when burned in a good Argand- burner at the rate of five cubic feet per hour. I also know, from my own experiments on lamps, that the light given by a good moderator or Carcel lamp does not exceed ten to eleven candles, even when the consumption rises to the high rate of 760 to 800 grains of oil per hour, and the lamp tends to smoke. I cannot, therefore, understand why common coal gas (unless it be very common indeed, and even then the inferiority may to a large extent be compensated for by a larger consumption) can afford much less light than an oil lamp. Your correspondent shows himself to be so well informed on the subject he writes upon, that I shall be glad to see some further observations on the lamps he considers the best to bo employed, and on the comparative effects produced by them and by gas flames. For my own part I will make some trials as soon as my engagements will permit, and communicate the results, if they be of sufficient interest, through the medium of your journal.—Yours obediently, F. W. H. London, March Wth, 1868. PRELIMINARY COATING OF ALBUMEN IN THE WET PROCESS. Mv DEAR Sib,—Mr. Jabez Hughes, in his excellent manual, p. 112, cautions beginners in regard to using again glass for negatives that has once been used ; and few who have tried to use the same plates often will do otherwise than endorse his statement. Professor Towler, in the “ Photographer's Guide,” recommends that a coating of dilute albumen be given to all plates (and, of course, dried) before collodionizing; and in Humphrey's Journal of last year he strongly recommends it, more than once, if I remember rightly. Allow me to state my experience in the matter. A few months ago I had collected about a gross of plates, all old, and nearly all varnished, and many of them had been used several times. I boiled them in a strong solution of common soda, then washed them clean under a tap, dipped them for a short time in a dilute solution of nitric acid, washed them again very carefully, and then, while wet, coated them with a solution of albumen, 1 to 20 of boiled rain water, with a drop or two of ammonia to a pint; dried them, and put them away for use. I have now been using these plates for about six weeks, and certainly have every reason to be satisfied with them. There is no possibility by any ordi nary fair means to get the film off the plate ; it adheres most tenaceously, and stains-streaks and the usual consequence of Using old plates are extremely rare. I am, in short, delighted with the plan, but should like much to hear something about it from others who have tried it and failed. If albumen finds its way into the bath, of course it will soon tell. My plan, before coating with collodion, is always to clean the back of the plate and edges very carefully, and as the collo dion then covers the albumen it can be but very little that is exposed to. the silver solution. At all events, I have not yet been able to see that my bath degenerates any the sooner because of my using those plates. I should be very glad to learn the experience of any of your readers who have tried albuminizing their plates and have given it up. Apologising for this lengthy epistle, I remain,— Yours very truly, Kent. SOME EXPERIENCES WITH BATHS. Dear Sir,—In the early part of last season I had a bath of 40 ounces which was laid aside for throwing down, only it was put in the open air, exposed to sunshine and shower. Another and another were laid aside for the same purpose, until there were six ; but the sixth had bothered mo a good deal at first with white markings, principally proceeding from the two corners next the head of sitter inward. These markings were half way through the film of collodion, and a little raised above the surface ; they gradually wore away, however, and, after being used up, it was, like the other, laid aside and a new one commenced; but No. 7 was, if anything, worse than No. 6 in those markings ; so I thought I would seo what any of my old baths would do for me, and took up my 40-ounce one (the other five contained only 22 ounces of water), which did well for a day. Next day No. 2 was taken up, and did well ; then No. 3, &c., with all the rest. No. 7 I have beside me, and hope it will be all the better for rest, and from having been in contact yith a few collodion films. Having tried the strength of the first bath, it was found to contain only 24 grains to the ounco, so I strengthened it and all the rest to 35 grains with common printing silver, and wrought away with them as before, until Mr Bovey called our attention to sugar in the printing bath, when, not expecting much more out of these old baths, and having resolved to start afresh with new ones next season, I took it into my head to treat the worst of them to J ounce of sugar, and, contrary to my expectations, it did well. Other four were treated to } an ounce each, and they also did well, and my old friend of the 40 ounces got 1J ounces loaf sugar, and it did as well as any of the others, I think even better; and they were all used one after the other as before. And when, lately, our attention was called by Mr. Johnson to permanganate of potash, I thought these baths could not but be full of organic matter, so I took your advice, and got the crystals and put 16 grains into an ounce of water, dissolved them, of course, and put 3 drops into my 40-ounce friend, shook it up, but no pinkish hue ; put other 3, and yet other 3, until there were 12 drops added; let it stand awhile, then filtered; it was pretty clear; but I tried 3 drops more, and no signs of the proper hue ; then 9 drops wore added, and at last the pink went gradually off into the brown; let it stand an hour or two, then filtered, and got a very transparent solution, which the argentometer says con tains 34 grains to the ounce, but I am not so very sure about it. The other five were treated in the same way, and, with one exception, are transparent, and promise well. This one got more permanganate than the rest to bring it to the pink colour, but it positively refused to yield to the treatment, so I was obliged to let it stand a while, and then filter; and this bath, after filter ing two or three times, had a clear pinkish tinge remaining for a few days, but it has gradually changed into a fine light brown, though it has thrown down no deposit as yet. I have not had an opportunity of trying it, or any of the other 22-ounce ones, but have taken a few quarter-plate negatives with No. 1, and it promises to be as good as a new one. It behaved in the same manner as I have seen new baths behave; viz., the first plate bad, the second better, the third pretty good, but a slight deposit on the shadows, which 3 drops of strong nitric acid cleared away. In respect to photography and disease I may say that, like our friend, D. Welch (Photographic News, March 13th, 1868, page 130), I have wrought for four years from seven in the morning till nine, ten, and sometimes twelve at night, doing everything in connection with the requirements of a small business in a somewhat remote country place (with the exception of a little assistance in printing and mounting), and believe he is right when he says “ the great temptation to over-exertion- in summer, and irregularity in taking food, are greater enemies to photographers than their chemicals.”—I am, dear sir, yours truly, W. C. Alexandria, Dumbartonshire, Scotland, March 11th, 1868. [Some cards subsequently produced from a negative obtained with one of the corrected baths are very bright and clean.—Ed.] Ualk in the Studio, Photographing the Eclipse of August next.—The Athenaeum says :—“ Major Tennant is going out to India to observe the total eclipse of August 18, with a special view to photography and polarization, the cost of the expedition having been sanctioned by the Secretary of State for India. Major Tennant will be accompanied by three non-commissioned officers of the Royal Engineers, well exercised in photographic manipulation; so that good pictures of all that takes place during this almost uprccedented eclipse may be anticipated.” Hyposulphite of Soda as Anti-Chlob.—A correspondent of the Chemical News says:—“ There is a largo demand for hyposulphite of soda by paper makers as so-called anti-chlor ; about 200 tons per annum are yearly consumed in photographic operations alone, while a far larger amount is used by paper makers ; hyposulphite of soda is also used by bleachers of calico fabrics. Sulphite of soda is of a more limited use, and somewhat superseded by the hyposulphite. PHOTOGRAPmIC Invention.—Dr. Loewe, whose name is known to the public in connection with several secret processes for printing on silk, enlarging, &c., has a singular announce-
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