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The photographic news
- Bandzählung
- 6.1862
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- 1862
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 187, April 4, 1862
- Digitalisat
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Zeitschrift
The photographic news
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Band 6.1862
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- Register Index 619
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Band 6.1862
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[APRIL 4,1862. 168 THE PHOTOGRAPHIC NEWS. Ualk in the Studio. the ammonia. As soon as the precipitate ceases to be dissolved, stop See Mr. Hannaford’s paper on the subject at the South London Society on p. 183 of our fifth volume. , E. F.—We cannot give you definite information on the commercial value 0 stereo negatives. It entirely depends on the interest of the subject, ana the excellence of the quality. We can only repeat our former advice; write to the various publishing houses, and send specimens. If they do not answer you, it is simply an indication that your subjects are not in demand. The fixing of diaphragms into compound lenses is the work of an optician ; your own ingenuity may supply them for a temporary purpose. A.—There is no secret in getting an even background, except careful and skilful manipulation. We can only conjecture which part of your manipu lation is at fault from the specimen enclosed ; but it seems probable that after washing away the iron, you applied pyro and silver at once to the plate, which not flowing evenly and taking kindly at once to the surface, deposited the silver in patches upon those parts it was first in perfect con tact with. To avoid this, apply the pyro solution at first without silver, and pour it on and off once or twice, until it flows evenly ; then return to the developing cup, and add a little silver; mix thoroughly, and apply again, when the deposit will be even and regular. With the exception of the uneven background, the photographic qualities of your specimen are very good. A little more grace might have been secured in the pose ; the head is too much thrown back. Juvenile.—There are many contrivances for rapid washing; but we have not seen any which it would have been wise to patent. We cannot, of course, say '.whether your plan is worth patenting, as we are in entire ignorance of its character. Not one photographic patent in ten pays its PROPOSED Office for the International Sale of Pho tographs.—Wo have received from M. Edmond Potonie, of 6, Alderstrasse, Berlin, the prospectus of a projected office for the international sale of photographs. The object is to faci litate the distribution throughout the Continent of the best works of the best artists, and it is proposed to publish a universal catalogue of all photographs which are intended for the means of international sale. Depots will be established in large cities. Photographers interested in the matter are re quested to communicate with the gentleman above-named. The late Prince Consort.—We have received from Mr. Wood, of Edinburgh, a lithographic portrait of His Royal Highness, the late Prince Consort, which, to photographers, possesses great interest as a rare illustration of the perfection with which the characteristics of a photograph may be repro duced in an artist’s drawing on a lithographic stone. The portrait before us is from Rejlander’s photograph of the Prince already noticed in these pages, and renders in an admirable manner all the photographic minuti with some superadded qualities within the power of the draughtsman, but not always under the control of the photographer. The portrait is very striking as a likeness, and very perfect as a specimen of litho graphic art. Messrs. Schenk and Macfarlane, of Edinburgh, are tlie photographers ; and Mr. Wood, of the same city, the pub lisher. We understand that the same gentleman is about to publish an enlarged lithograph of Rejlander’s “ John the Baptist.” The Power of Photography.—Photozincography is cer tainly a stupendous word, but its stupendousness is well suited to the art of which it is the verbal exponent. If pho tography works wonders, photozincography, in the matter of multiplying ancient manuscripts, works nothing short of mi racles. If the bards of old Greece were astonished at the daring inventions of the men of their day, how would they marvel were they but conscious, as they lie peradventure beside their nectar, rs &uvp@v aKifnitrTduv, of the audacity of our age, which, not content with making the steam its bond-servant and the lightning its messenger, borrows the very rays of the orb “ that, with surpassing glory crowned,” looked from its “ solo dominion like tho God ” of the new born world, to produce us d discretion the long-forgotten re cords of ancient men and ancient times! Tho men of our day are bolder than Prometheus: he filched but a reedful of fire for mortals (vapkotApetov 31 enp@uau irvpbs ttyhy KKoiralav'), they press into their service the blessed sun itself. And he makes an unexceptionable servant. He is always up in tho morning at the right time; he is always accurate ; he is never weary; he never gossips; he is never imperti nent ; and though he may bo said to drink a good deal, his beverage is principally water. Ho occasionally looks sulky, too, and sometimes appears to be absent, but it is only in appearance ; he is always at his post, but nebulous enemies surround him and impede his action.—The Critic. Ul Uorrespoudents. J. E. B.— Many of the lenses by the maker you name are very good. Use your aceto-nitrate bath a little more acid; wash carefully to remove all free silver ; add a little more citric acid to your developer, and develop more slowly. The use of a very powdery collodion, especially if over iodized, will sometimes cause the whole of the image to be dissolved. Painting any portion of your glass with white lead will keep out a great deal of light. If you wish merely to keep eyes out of the room, there is a method of treating the glass with Epsom salts, which will effect this without stopping out much light. Your positives are pretty good ; but some of the negatives would have been better for longer exposure. Avoid white back grounds for portraiture. Some formula; for varnishes have recently been published in the News. Those who have used that recently given by Mr. Fitch speak very highly of it. You can doubtless buy the white varnish at an oil shop. We apprehend that albumenized paper may be sent rolled and open at the ends, by book post. We cannot say with any certainty where you can get it certainly of good quality. We have recently seen fine samples, both from Sandford, Marion, and Bourquin. Your dry plate negative would apparently have been better for longer exposure or slower development. You need not apologize for troubling us. We shall always have pleasure in helping you to the best of our ability, so far as it is possible to do so in this column. G. A.—Mr. Hannaford’s or Mr. Bartholomew’s modification of the Fothergill process consists in adding nitrate of silver to the albumen solution con taining ammonia. The object is, primarily, to gain a more even coating of albumenite of silver; and secondly, to increase tho sensitiveness. The proportions recommended are : the white of an egg, three ounces of water, and 12 minims of strong ammonia. To this, nitrate of silver is added, drop by drop : a precipitate is first caused, which is then redissolved by expenses. How do you assure yonrself that the hypo is quite gone ? No. 35.—We should not recommend the addition of a third lens to a double combination for the purpose of shortening the focus. To have such al addition made by a first rate optician would be more costly than the result would probably be worth ; and if done at random, or by an incompetent person, would be useless. We do not know who did this work for Mr. Archer ; and from what we have heard of the results, we should not think it any particular gain to learn. Non Success.—A creamy film in the bath depends on several causes : the character and quantity of the pyroxyline, the strength of the silver bath and the quantity of iodides, &c. One of the likely means to secure it and obtain more intensity at the same time, is the addition of a little more pyroxyline to the collodion. A low temperature will sometimes keep thi film of iodide, of silver thin and blue. One in Trouble.—If the use of kaolin, citric acid, or a chloride fail to clear your silver bath, the best plan will be to precipitate the silver in this and make a new one. Col. Alb.—It is not desirable to dilute the albumen solution so largely^ you propose. 2. Authorities differ as to the drying of collodio-albumet plates, in their first stage, in daylight. Mr. Wardley, an excellent autho- rity, says emphatically that it injures the brilliancy of the negative. Where there is doubt on the subject follow the safest course. S. B.—The solution of gallic acid for final application to Fothergill dry plates may be used in a dipping bath. It maybe kept if closely corked ands little camphor added ; but we should prefer to use it fresh. Careful mani pulation is the only mode of preventing markings from the irregular flow of the albumen. Or if the whole of the free silver have been previously removed, such marks will not be so likely to occur. Gold.—To precipitate the gold in your old toning baths add protosulphate of iron. This will throw down the gold in a dark powder. A. B.—The proximate cause of the cracks in your varnish is probably damp' Imperfect washing after fixing, or the use of a bad varnish would aid the result. 2. About an ounce of acetate of soda to a pint of water; immerse the prints about ten minutes. Focus.—Your letter has been mislaid. If you will write again we will answe by post to save delay. A Novice.—There are several excellent instruction books published. On of the most recent and best is that by Mr. C. Jabez Hughes. Comm 01 earthenware dishes will do for printing solutions, but take care to kee? each always to its own purpose. J. II. Redin.—Mr. Fitch gives the recipe at the close of his paper. It i simply "white hard varnish” purchased at an oil shop, and diluted witl methylated spirit to a proper consistency. Excelsior.—The faults in your prints arise from the negatives as much a from the printing. No. 1 is from a poor under-exposed negative. No- 7 the negative is better but thin, and the positive is overprinted and ove‘ toned. The quicker paper is dried after sensitizing the better, but it shoul" not be done in even a subdued white light. It will not be injured by e” citing at night and printing and toning next day. 2. The smaller tb circle an arc of which your Latimer Clark camera travels, the greater th apparent amount of relief in the combined images, but at the same tin, the smaller more toy-like and unnatural the effect. The greater the circ and the less convergence, the better and truer the effect. Of course t adjustment must be made with some reference to the position of the P‘ tures on the plate. . F. G. — Other things being equal, it is possible to take equally good picture on either wet or dry collodion plates. There is no necessity for dry pla pictures to be either coarse, spotty, or hard. Proper exposure and carel development, especially the latter, are the most important points. 5 | Wm. Gillett.—You will find an article on the construction of glass roo" on p. 73 of our third volume. , A. Tyro.—Your prints were imperfectly fixed. Either the hypo was ta weak or the prints did not remain in long enough. The first action Whte takes place on putting the prints in hypo is the formation of hyposulPlds. of silver, which is next dissolved by the excess of hyposulphite of Sna If the solution is not strong enough, or the prints are not left in > g . enough, the hyposulphite of silver is not dissolved, and becomes dELied posed in the course of washing, producing the dirty, brown, specs | effects your prints show. a 60 J. H.—A portrait combination with lenses of 12 inches diameter, a ? inches focus, by a first class maker, would cost from £80 to £100, orred sibly much more, so far as we can conjecture. The length of room req I would entirely depend on the size of the figures you require to prodtthd Gravity.—The use of a specific gravity bottle is to ascertain the stren"il the fluids, by their relation in weight to a similar bulk of water, .-oinmo find the principles and mode of use explained on p. 248 of our third V° Several correspondents in our next.
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