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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. 199, June 27, 1862
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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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THE PHOTOGRAPHIC NEWS. 312 Ualk in the Studio. and after the Uo Corxespoudents, has been suc- the thanks of of the tannin to relate to important events some time before reign of Elizabeth. Honey and Tannin.—A correspondent who cessful says:—“ I think Mr. England deserves all dry-plate photographers for his modification PHOTOGRAPHIC Exhibition.—An exposition of works of fine art is about to be opened at Spa, and we notice with pleasure that under the directors recognize photographs as coming distinctly that designation. The Secretary writes to our contemporary, the Bulletin Beige de la Photographie, inviting contributions from photographers, and stating the regulations which will govern the exhibition, one of which is somewhat unusual, namely, that reproductions of engravings, statues, &c., will not be admitted. Mb. Mudd, whose name our readers have known as one of our first landscape photographers, perhaps the first dry plate photographer, has yielded to the pressure in the shape of demands made upon him for portraits, and has resolved to devote a portion of his time to portraiture, as well as land scape. We shall be sorry if the latter is at all sacrificed to the former. Application of PHOTOZINCOGRAPIIY.—It is stated that a proposition is under consideration for sending a photographer to Simancas, in Spain, to copy some of the dispatches in cipher deposited in the royal archives there, and which are supposed process ; any one with ordinary care must succeed.” New Copyright Bill.—This Bill still remains before the Select Committee of the House of Lords. A petition has been presented by Lord Overstone from certain goldsmiths, silver smiths, and porcelain dealers, that their works, comprising art designs, might bo included in the protection of the Bill. Tax Upon Photographers.—A new tax Bill, under con sideration in the United States, imposes an annual tax upon certain trades and professions. Photographers are charged with a tax of two pounds a year. Fulminating Silver.—If you pass a current of coal gas through a neutral solution of nitrate of silver, you obtain a crystalline precipitate, which when dry explodes under the action of heat, or the blow of a hammer, like fulminating silver. Gun Cotton.—Every tissue from vegetable origin, like cotton, linen, &c., can be transformed into gun cotton. To distinguish gun cotton prepared with nitric and sulphuric acids, from the one prepared with nitrate of potash and sulphuric acid, dip them into a mixture of 100 parts ether and 25 parts alcohol, the first will not dissolve, while the latter dissolves entirely. [June 27,186'- PUNJABEE.—Vulcanized india-rubber would exercise an injurious effect on coming in contact with the nitrate bath, on account of the sulphur it con tains. Boiling the india-rubber in a strong solution of potash is said to re move all sulphur from the surface. It is a better plan, however, to cover the vulcanized surface with a thin piece of gutta-percha, about the thick ness of paper, or with vegetable parchment; this will not interfere with the elasticity or perfect pressure of the india-rubber on the water-tight lid. 2. Where acetic acid has been added to a bath it is difficult to eliminate it. You will find some information on the subject in one or two recent com munications in our pages. You may neutralize either with oxide of silver, or with bicarbonate of soda before sunning your bath. We have given from time to time all the information of a practical character which has been published on the panoramic lens. It has not come much into general use, but there is no especial reason beyond its novelty, and involving the necessity of a complete equipment of baths, slides, printing frames, &c., to prevent it. See a recent paper by Mr. Dawson on its practical working. INTERIOR.—A variety of ‘plans have been proposed for preserving the plate from drying during very long exposures. Such as adding some neutral deliquescent salt, like nitrate of magnesia, to the silver bath, covering the plate with some preservative, such as oxymel, honey, glycerine, or glyce rine and honey, laying a sheet of wet blotting paper at the back of the plate, &c. The method we have generally used ourselves consists in using a porous collodion, which does not dry so rapidly as a horny one, and when we have in hot weather observed partial dryness, we have washed the film with a little distilled water, and then added this water to the developer. This in our hands has always succeeded, and given entire immunity from stains. It is sometimes recommended to redip the plate in the nitrate bath under such circumstances, and there are occasions when this can be done with advantage, but if there be the slightest tendency in that direction it causes fog. It is important in long exposures to let the plate rest on a piece of blotting-paper at each corner. Derby.—Benzole or chloroform will remove crystal varnish from a negative. 2. You may probably obtain a bellows body of any of the practical camera makers: the cost we cannot tell you. 3. The front lens of a portrait combi nation, having a focus of 10 inches will, if properly stopped down.pri cover about 7 in. by 5 in. 4. Marine glue is said to be madeofshpsau india-rubber ; but its exact composition is a trade secret, ne areg hear of your success with honey and tannin. Cornish Chough.—You have no reason whatever to be dissatisfiemwiemtja results, they are both very fine photographs of trying subjects, -hes one is especially pretty and satisfactory. Athind W. J. C.—The charge is a foolish and improbable one, inasmuch 28 6 could possibly be gained by abstracting or changing some of the E It is certainly quite possible to remove part of the combination and tute other glasses, inasmuch as all the lenses of a given size are 5td and, we believe, in the common French lenses, are put together* 1 g much selection, large quantities being ground to the same curves, subsequently fitted without very specific attention. It is not.Ppsgo that the respective lenses of such a combination will be marked w j admit of identification. If the lens really be in any way outofordd possibly from the lenses being put in the wrong position, or not F < quite true in their proper position. Your only mode of setting right is to show the absurdity and uselessness of such an exchange" are supposed to have made. . ad CASSAXDRA.—The silver from old hypo baths should be precipitaugdd liver of sulphur, and nitrate of potash may be used as a flux inrto the sulphide to metallic silver. See page 50, vol. v. of thcPnoroo News. The spot on the enclosed picture appears to be caused oy’Jg or splash of some chemical on the print, probably an acid, but Wend tell what. We shall have pleasure in receiving your method of j ting. i gy W. X. G.—Excess of acid in a gold toning bath made by any formu * be neutralized with a little bi-carbonate of soda. . J J. DysoX.—The best varnish we know for coloured glass positives is he co Colouring Varnish, or the Alabastrine Varnish sold by Squire. Thly will always be a little lowered by varnishing ; but maybe easily reago J. F.—The keeping properties of dry plates after exposure and before C e ment is a subject about which some doubt and difference of opiniol. We have heard of tannin plates keeping perfectly, but then we hen of some that have not kept. The use of honey and tannin is so reg s" we have little information of the keeping properties of the plates g• have heard some complaints that they do not keep so well as tanntn ef, We believe the safest process for keeping is the collodio-albumgs, cially if the plates after sensitizing and washing, receive a finayod gallic acid, as suggested some years ago by Major Russell. * * . P under a misapprehension as to the mode of using a portraitmo landscape purposes. The allusions you have seen refer to the rel the back lens entirely, and then reversing the position of the1 ip V If your portrait combination is not arranged properly for usi5 manner, your best plan is just to stop it down and use it as it is ( fF R. G.—The prints are on the whole very good, and the negatives I(be over exposure. The conditions of lighting might have been a lit mapi and a little more brilliancy, perhaps, might have been secured Wngb ment in developing and intensifying. The question of intensizgrg or after development much depends upon the character of th image ; more softness is generally obtained by intensifying befodo bo, more brilliancy by intensifying afterwards. Some operatort sppg there is no reason, when the negative which has been intensifs B to lack vigour after fixing, why it should not be intensified agalndsy application first of a solution of iodine, and then applying pyroatd,, I and if need be continuing this alternately, any amount of intetsh" gained. We shall be glad to see the 12 by 10 specimen covered" a of 1112 inches focus. . J. G. M.—It entirely depends upon the fittings of the combinatsepy the front lens is intended to be used as a single lens, as to what To must take in using it for landscapes. The usual method is to rfzud back lens, and, having unscrewed the hood, turn round the tubev that part into the flange which was screwed into the hood. 1 Phe) ' method, but different plans are used by different makers. m ' to be able to reverse the front lens, turning that side inwards’■ • out, and to be able to place a stop at the proper distance in frol‘ « F. M.—Save all your clippings and waste prints, without fixins;, some convenient opportunity burn them and save the ashes. 0,P then be reduced with a flux, such as borax, nitrate of potash," g usual manner. as G.—In using any substitute for ground glass, in putting up tranzoj always place the prepared side next to the transparency; it will,sce oft'. Of course wax, or starch, or any such preparation will readt-y7 exposed. The method of deadening glass with an acid abouasodb enquire will give a very fine dead surface, but is a little troubipu, needs great care from persons unaccustomed to chemical mGybd To deaden glass in this way the vapours of hydrofluoric acid Epo" The bottom of a leaden or gutta-percha vessel is covered Wieacs, fluor spar, over which sulphuric acid is poured, and gentle HCvbgj which causes the generation of hydrofluoric acid fumes, ablccf glass to be deadened is to be placed. Hydrofluoric acid is v5itse and should be used very carefully. The application of theac gedl, not produce deadness. 2. Photographs for exchange can 5 secretary of the Exchange Club at any time. The exchange® every month. tjollyy, G. G.—The mark you describe is probably caused in the PrePith cee” plate by irregular draining or drying ; but we cannot say' ’ pV Where the unaltered iodide has not been entirely removed, in t be wetted again, and treated with hypo. If there be any era of course very great care will be required. . II. R.—You will find several descriptions of dark tents iov g Perhaps Leake’s tent is the simplest and cheapest, -ou p scription on p. 381, vol. iv., Photographic News. nthe" W. Morgan.—Use the alkaline gold toning bath, and aban" of gold and hypo. Try :— 1 grail Chloride of gold 30 raid j Acetate of soda ••• r dunceg Distilled water ... pMw Mix one or two days before using. Tone in this until tn i h deeper than required, then rinse and fix in a bath o pnof0 ounce in five of water. See article on toning, &c» in 1 News Almanac for this year. Several correspondents in our next.
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