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The photographic news
- Bandzählung
- 12.1868
- Erscheinungsdatum
- 1868
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- Englisch
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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. 498, March 20, 1868
- Digitalisat
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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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THE PHOTOGRAPHIC NEWS. [March 20, 1868. out, where we can, remedies for the suffering, rather than to laugh at the sufferers. R. M. S.—The design and proportions of your proposed studio seem excellent. We should use common 21-ounce sheet glass unground. The process of grinding destroys the power of glass to transmit light in an enormous degree (in some cases as much as 60 per cent.), and, except when exposed to direct sunlight, its diffusing power is not required. We believe that a very pale and delicate cobalt blue glass has some advantages; but, on the whole, we prefer the com mon sheet glass, as least liable to change, and, being the cheapest, its occasional renewal, if it change colour, is not a serious matter. M. Salomon, as we have stated in the News, with a glass room of a somewhat similar character to that you propose, has the whole of the skylight stippled to give the effect of ground glass. This can be done at any time in your proposed studio if you find it desir able to subdue the top light permanently. Mr. Blanchard’s plan of using starch obstructs less light than grinding or stippling with white paint. W. Norman.—The second you mention—that is, the London maker—undoubtedly. James Cornwall.—Wo cannot explain the circumstances, but will endeavour to take occasion to enquire. The work is, however, so old and out of date that it would be of comparatively little use to you. There may possibly be another edition prepared at some time; but there has been no new one for many years. Earnest.—Your proposed alteration on the south side of your studio will probably be an improvement. The chief error in your lighting arrangements appears to bo the management of the north side light. Ono imperative condition of good light is to employ the use of one dominant light, and not a scries of distinct lights; the varied patches of light formed by 1, 2, 3, 4 on the north side cannot give satisfactory results. Lot the whole of the side light from 1 to 4 consist of clear glass, using blinds on sliding rods to circumscribe the area of light when necessary. The best lighted pictures of those you enclose are B, F, and G. H. E.—Your question is much too indefinite to enable us to give you definite information. The cheapest way to go to work to build a glass house depends on so many circumstances. Much depends upon whether you intend to use wood, bricks, or iron, in conjunc- tion with glass, or which you will be permitted to use by the Dis trict Surveyor, should you be amenable to such an officer. A simple oblong building of ridge-roof or lean-to form of the size you men tion, 20 feet by 8 feet, may be erected for from £30 to £100, de pending on strength, finish, position, and other circumstances. You will find 8 feet rather too narrow ; 10 or 12 would be better. Decide upon your general requirements, and then consult a builder; and, after deciding upon details, get a contract. Lizzie.—We cannot give Lizzie any very satisfactory information, wo fear. Mr. Day, of 20, Cockspur Street, was, during last month, gazetted as a bankrupt. How the subscribers to the Art Union for the distribution of chromo-lithographs will fare, we cannot tell. Rheumatic.—Your Ross’s triplet will answer well for enlarging. 2. Its focus, so far as we remember, is 8 inches ; in which case, in enlarging a card to 20 by 15, the distance between the lens and focussing screen would be about 56 inches. 3. A “common French lens” is scarcely likely to be suitable for enlargement, unless it chance to be a very good one. 4. Without knowing the focus we cannot state the distance required between the lens and focussing screen; probably between 40 and 50 inches. Tomahawk.—Your flatted backgrounds must not be wetted before placing on a frame ; by a little skill you may stretch the canvas pretty evenly. Attach the whole of one side with tacks first, then stretch gently and attach the other side, and so proceed. .2. “Flatting” consists of oil paint ground with turpentine and the smallest possible proportion of oil which can be employed; it is applied in the same way as oil paint, but requires some manipu latory skill to secure an even surface. Two persons effect it best; one applying the paint, and another following with a “ softener ” to blend the brush-marks. Bromo.—-We have not before met with such spots, but will give the matter our attention, and, if possible, trace the cause. B. Magic.—The result you enclose is very promising. Experience alone will enable you to arrive at the best results in any new application of this kind. Possibly printing the image on glass, and then, when all the processes have been completed, transferring the film to wood, might answer, and prevent the surface of the wood becoming rough. L. S.—In an English inch there are about 25 millimetres. A metre is 39 inches, a centimetre is one-hundredth part of a metre, and a millimetre one-thousandth part. About 22 centimetres make an inch; and, of course, about 30 centimetres make a foot. We state the proportion in round numbers to avoid minute fractions. You will do well to familiarize yourself with the metrical system, which is that most commonly used in scientific statements of measure. H. A.—Permanganate of potash may be used for removing organic matter from printing baths, as well as negative baths. Mr. John son objects to Condy’s fluid for the purpose as being often impure; in our own practice we have met with tolerably pure samples, and should not hesitate to use it when the permanganate in crystals was not readily accessible. 2. The fixing bath mentioned in the article to which you refer is exceedingly weak; weaker than we should recommend. The reason why a weak fixing bath is there thought sufficient is, we presume, that in the other part of the formula the solutions are weak; and the less silver salt in the paper, the weaker’ may be the bath in which the prints are fixed. When a sulphocyanide bath is used for toning, a somewhat weaker fixing bath may be used. 3. The experience of the gentleman who warns you against intensifying with pyro and silver preceded by iodine, and recommends bichloride of mercury as giving a more stable negative, is exceptional, and we cannot advise you to accept his advice. We have not found any deterioration in negatives intensified in the first-mentioned manner. W. J. A. G.—Mr. Claudet did make a lens of topaz; but did not, we believe, get the diamond lens made, as he intended, had he lived. Prints from a negative taken -with the topaz lens will be presented to the members of the Photographic Society. 2. The lens you mention, if it work well, is undoubtedly cheap at the money. You must bear in mind, however, that the whole-plate lenses of French opticians are rarely larger in diameter or longer in focus than the half-plate lenses of English opticians. J. W. H. A.—Oil cloth or kamptulicon is best for the floor of a studio, because they may be easily kept clean and free from dust. Carpet or cocoa-nut matting may be used, but require more care to prevent the occasional annoyance of dust. The colour of the matting would not be too light, unless a strong top light fall upon it. M. Wane.—We. regret that we cannot give you definite information as to the period of receiving contributions at the Leeds Exhi bition. Top-Light.—We'should suppose that the defect to which you refer— namely, the faces being flat and white, and the drapery too dark— was due to slight under-exposure. The white calico diffuses the light throughout the rooms, but prevents direct light reaching the model. D. S. (Aberdeen).—The decision as to the method of enlarging much depends on the results desired, and the appliances and skill you possess. If you wish to enlarge small negatives, up to (say) 12 by 10, then the process upon collodion and transferring is good. If you wish for more extended enlargements, the production of en larged negatives, or the use of the solar camera for producing en largements on paper will be better. In all such matters it is im possible to say that any special method is the best, as each is qualified by circumstances, and each photographer must deter mine for himself. Try the enlargement on collodion, and then transfer; this is simple, and requires but little apparatus beyond what all photographers possess. 2. If you succeed well with the acetate bath, do not change. We described the sulphocyanide bath as giving special results suited to special circumstances, but not as preferable for general use to the acetate bath. We prefer the acetate to the phosphate. 3. We do not think that the small miniatures you mention will ever become a rage, and they could scarcely be of much importance commercially if they wore. We cannot write private letters in answer to photographic queries : our time is too fully engaged. W. H.—A properly finished Daguerreotype does not fade; but it may become obscured by tarnish by exposure to the atmosphere. This tarnish may be removed by cyanide. First wet the plate and see that the water flows freely over it; sometimes alcohol is necessary to secure this; then, when the water flows without appearance of greasincss, apply a 10-grain solution of cyanide, which will quickly remove the tarnish; wash well, finishing with distilled water, and dry off with a spirit lamp. This is an operation best performed by a person familiar with Daguerreotype manipu lation. W. J. L.—We fear that we have no correspondent at Vienna to whom we can address such enquiries, but will see if opportunity serve. R. H. Courtenay.—Thanks. J. L.—The exposure of 90 minutes with a wet plate in landscape photography to which you refer is, of course, absurd; the statement is doubtless an error of the writer, who has a very imperfect know ledge of such matters. 2. All the paragraphs you name arc un acknowledged extracts from our own columns. 3. Probably very speedily. Henry Spink.—We presume that transfer paper can bo obtained of dealers in lithographic materials, such firms as that of Hughes and Kimber, for instance. Your letter in our next. B. B. L.—There are occasionally other injurious sulphur compounds in cards besides hypo. We shall have something to say upon tho subject shortly. Several Correspondents in our next. Several articles in type are again compelled to stand over.
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