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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. 514, July 10, 1868
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Zeitschrift
The photographic news
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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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336 THE PHOTOGRAPHIC NEWS. [July 10, 1868. present day to use albuminized prints for colouring ; but, to a per son more familiar with ordinary water-colour drawing than photo graphic colouring, plain salted paper will present the least number of difficulties. John Hilley.—There will bo an agent, we believe, for M. Carrier’s paper in this country, which will doubtless be duly announced. We cannot say at present whether any greater permanence is promised by his process. 2. We do not know of any practicable carbon pro cess besides Swan’s. The method proposed by M. Marion woulc be, we believe, an infringement of Mr. Swan’s patent. Mr. Blair has worked with praiseworthy perseverance at carbon printing, but we do not know of any practicable process he has proposed which might be used as a substitute for Swan’s. 3. The patent rests chiefly, we should say, on the use of a distinct tissue which permits printing on one side and -washing away on the other, and on the modes of transfer employed. We do not know of any one who teaches carbon printing. E. Morgan.—You will find the formulae you require in any good manual of photography or in any of our Year-Books. The cause of the discolouration of your toning bath is probably contact with dirty fingers, especially with fingers which have touched hypo; or possibly the use for the toning bath of a dish in which prints have been washed, to which some trace of hypo may cling. Our engage ments do not permit us to answer questions of this kind privately. T. P. (or some similar initials very carelessly written).—The prints enclosed are pretty good, and the negatives are not bad, but a little under-exposed. We cannot give you any idea of what salary you-might obtain or be worth. An Enquirer.—The construction of your studio will doubtless have to be subject to the control, in certain respects, of the local autho rities. Different towns are under different forms of local govern ment, and all public buildings must conform to certain conditions laid down by such government. In your case it is probable the Board of Health will possess such power. As a rule, wooden buildings are not permitted, because of their liability to fire. B. N. P.—The strength of the ethereal solution of wax is not im portant, the chief object being to obtain on the plate an almost imperceptible film of wax, which, being a neutral substance, pre vents chemical action from any dirt on the glass. The use of wax for such a purpose is an old idea, but how old we cannot with cer tainty say. About four years ago it was proposed by Mr. Wende- roth to be applied to the glass to aid in transferring operations. Mr. Henry Cooper at that time called especial attention to its value in giving immunity from the influence of dirt. Its subse quent recommendation for use on dry plates of course was not original. The remarks and the ignorance to which you refer were alike characteristic, but arc not worth comment. Veritas.—The lighting of the figures is pretty good; in Nos. 1 and 3 the negatives have been over-intensified. Tn all. the tone is good of its kind, but is blacker than we like. We cannot give you much information as to the chances of obtaining a situation, such questions being somewhat out of our province. Thomas Stothard.—The deposit of silver on the sides of the bottle holding the printing solution is due to the presence of organic matter, such as albumen, which has a tendency to reduce silver, especially if white light has reached the bottle. Dr. Stainthorpe.—It is important to remember that the only light which is of any real value in illuminating the sitter is that which falls directly upon him from the sky. To ascertain how much of this reaches the model in your studio place yourself in his posi tion and note the amount of the sky which you can see. We fear, from the diagram, that much of the light which enters your studio does not reach the sitter directly. The top-light is notsufliciently in advance of the sitter, but is directly over-head; and the still more important side-light will scarcely reach him at all, being cut off by the projecting portions of wall belonging to the folding doors. If these could be removed, and the side windows extended laterally on the north side, and also taken quite to the eaves, you would gain much additional light of great value in illuminating the figure; or, failing that, if you could extend the north window at E an advantage would be gained. J. C.—Pinholes may proceed from a variety of causes, of which the most common is the excess of iodide of silver present. We can not from any general description of results indicate the precise cause. The only mode in which a defect can be traced home to its cause consists in a series of exhaustive experiments, beginning with the most simple and probable sources of error. Read the chapter devoted to the subject in our Year-Book. Especially try the plan of keeping the bath cool by placing it in cold water, or tying a wet cloth round it. Fourth Volume.—The task of copying coloured drawings on old discoloured parchment is rather a difficult one, and probably several essays will have to be made before succeeding. Use a collo dion containing a full proportion of bromide, expose well in as good a light as possible, and develop with a weak iron solution. C. A. S.—The affinity between gold and chlorine is very slight, and the slightest excess of heat will drive off the chlorine and leave metallic gold. From your description it appears that a portion of the gold is converted into protochloride of gold, which is insoluble in water, and is often decomposed by its throwing down metallic gold. Tako care in evaporating to preserve a low temperature, and before the evaporation is complete be content with a slightly acid solution, and neutralize with carbonate of lime. 2. Mr. McLachlan resides at Manchester. The sample of nitrate of silver he prefers was found on examination to be pure nitrate of silver. 3. You can obtain nitrate of magnesia of your London dealer; or you may make it by neutralizing nitric acid with carbonate of mag nesia. 4. We cannot decipher your question as to citric acid. W. J. A. G.— Matt silver stains are of various kinds, and spring from various causes. The character and form of the stain afford some clue to the cause; but you do not describe the exact character. If they run from the edge of the plate it is probable that they arise from contact between the nitrate of silver and the inner frame of the dark slide, and that is a more common cause than is sus pected. We can only counsel you to read the various articles which have appeared on the subject in our last two or three volumes. Be careful to wash the inner frame very thoroughly; let the plate rest on blotting-paper; use a somewhat weak bath; and avoid the use of a horny, repellent collodion. We shall have something more to say on the subject in an article next week. We prefer 2, 4, or 5 of the collodions named. Silex.—We are obliged by the sample of carbon printing you have forwarded, and we shall examine the matter carefully. So far as we have had time to give to the matter at present, wo find your description quite correct; but it also appears to us that the edge of the white card on which the discoloured portion is mounted has become somewhat yellow, indicating that the same cause has acted on the card which has tarnished the purity of the print. 2. The damaged collodio-chloride print is a charming picture. The cause of the film splitting and leaving the paper is partly duo to the use of unprepared paper, but still more to the use of an unsuitable sample of collodion. It gives a film of the horny contractile kind, which readily splits. A more powdery, adherent sample should be used. The high glaze of this sample at once indicates the horny character of the film. A more powdery sample would give a surface with more of the matt character. We nave met with splitting films, but it is a difficulty wo have removed at once by using a suitable collodion. We shall have pleasure in seeing a perfect print from the same negative. Thanks for the paragraph, which we shall have pleasure in using. J. II. Burke.—Thanks.’ The Defendant.—A report of the matter was in type when your communication reached us. It shall have our attention. The continuation of Lieut. Waterhouse’s Articles on “ Photozinco graphy,” and several other articles in type, are compelled, from the pressure on our space, to stand over. Several Correspondents in our next. Photographs RegistereD. Mr. S. Glen PArNE, Aylesbury, Photographic Group of Dr. Newham's Winslow Band. Photographic Group of Mr. and Mrs. Willis’s Bridal Party. Photographic Group of Mr. and Mrs Willis’s Wedding Party. Photographic Interior of Monks’ Risboro’ Church. Mr. NIND, Birmingham, Photograph of Mr, and Mrs. Joshua Poole and Mr. Poole's Father. Mr. G. Teague, Swansea, Photograph of Prisoners working the Swansea Treadwheel. Mr. II. BERLON, Bradford, Photograph of Bradford Old Dungeon. Mr. D. B. Evans, Newport, Photogoaph of Usk Lighthouse. Mr. II. Robins, Landport, Hants, Photograph of King Theodore’s Horse. Mr. J. I. JEWeLL, Westerham, Three Photographs of Col. George Ward, L >n Ion R. Volunteers Mr. J. Pinder, Waterford, Four Photographs of Rev. J. Johnson. Mr. J. Stuart, Glasgow, Three Photographs of Rev. A. Bruce. Mr. G. W. Unwin, Walkley, Photograph “The Pet Lamb.” Mr. C. Mole, Birmingham, Two Photographs of Murphy, the Lecturer. Mr. A. Garnieb, Guernsey, Twelve Photographs of Victor Hugo. All Communications for the Editor to bo addressed to 15, Gough Square, Fleet Street, London, E.C. *.* All photographs forwarded to the Publisher for registration receive attention at once ; but the pressure on our space sometimes compels us to defer the acknowledgment in this column. It should be borne 1 mind, therefore, that non-acknowledgment at once does not necessarily imply non-receipt or non-registration.
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