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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. 532, November 13, 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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552 THE PHOTOGRAPHIC NEWS. [November 13, 1868. Corresponents T. G,—An Eburneum print is practically a transparency on opaline gelatine. It is obtained by camera printing on wet collodion 2. In printing stereoscopic slides in the camera on wet collodion no transposition in either negative or print is necessary. The operation of camera copying practically turns round each picture on its axis, and effects a similar result to transposition. Of this you can easily satisfy yourself by experiment. The lenses you mention will do very well, we have no doubt. 3. In the case you put there is a choice of two evils: at one end of the room the evening sun will trouble the sitter a little, and at the other it would enter the lens. We should be disposed to decide the question by experiment, trying whether you could more easily keep it by blinds from the sitter or the lens. 4. Hydrochloric acid alone is sufficient to precipitate silver as a chloride from washing waters; but salt alone is not always safe. 5. Wo believe that the period I for protection by registration is expired. C. M. writes:—« I am a chemist and druggist, and having care fully studied the new Pharmacy Act, have not a doubt that you are right in stating that its provisions do not come into operation until after the 31st of December, after which, as the first clause I states, ‘ it shall be unlawful ’ to neglect the precautions afterwards indicated. The uncertainty felt by some seems to have originated in an error made by a London magistrate, who fancied that the provisions of the Act came into immediate operation, and, when the eiTor was pointed out, justified his position by referring to a clause in the Act without a date. As the matter stands, it was at best but an opinion even regarding this clause, which is clearly I governed by the preceding one giving the date. If a decision had I been given on the assumption that the Act was in operation, we should have heard more about it.” The subject is scarcely worth I reiterated discussion, as very few, we imagine, dealing in poisons would fail to obtain the Act, from which they would gain full I information. The question does not appear to us to admit of a I doubt by any person not having a position to maintain. The I 17th Clause, defining some of the conditions under which poisons I may be sold, is clearly, as you suggest, together with all other I clauses, governed by the 15th Clause, which states that « from and I after the 31st day of December, 1868, any person who shall fail to | conform with any regulation as to the keeping or selling poisons I made in pursuance of this Act,” &c., shall be liable to a penalty I of five pounds. This is the only penal clause regarding the sale | of poisons which the Act contains, and is therefore the clause which defines punishment. The Standard points out that Mr. Flower cannot have read the Act very carefully, as he made a mis take in referring to “red precipitate” as a poison included in Schedule A in the Act, whereas it is not mentioned at all. I 2. Hyposulphite of ammonia in crystals has not yet become an article of commerce. Mr. Losh is manufacturing it in solution, but we believe that the difficulties in crystallizing it on a large scale have been found insuperable. Archer Clarke.—The date, as well as the name, is an essential item in the publication line of an engraving. The copyright in en gravings remains in existence for twenty-eight years from the date of first publication, which should be distinctly stated on the print. We shall examine your specimens, preserved by Mr. Robinson’s syrup, with interest. result. Our correspondents need not apologize or feel hesitation in presenting their difficulties; we have pleasure in answering them to the utmost of our power. C. T. U.—To become a member of any of the London societies it is necessary to be proposed at one of the monthly meetings, and balloted for. We shall have pleasure in proposing you. J. E. W.—The removal of prints mounted with starch is not easy, especially when they are in an album which does not admit of soaking ; but tho simplest and neatest plan is to cut pieces of thick blotting-paper rather larger than the size of the print, and, after saturating -with water, lay upon the face of the print. After soak ing in this way, continued for some time, tho prints may be gently removed. J. B. M.—It is a difficult thing to give a precise proportion of silver or silver solution to be added to the printing bath, because differ ent samples of paper, having different proportions of salt, reduce the strength of the bath in different degrees. Observation only can afford safe guidance in this respect. As a rule, the replenish ing bath should be stronger than the bath in use, because silver is removed in greater proportion than either nitrate of soda or sugar, the latter substances being removed in their due proportion to water, and no more. 2. We have not had any experience in copying horizontal tombstones, but should conceive that a lens which gives straight lines -will be necessary. If you could secure : sunlight, in the morning or evening, so as to get incised letters in shadow, we should imagine the best result would be obtained. Thomas Stothard.—In asking for some information on mounting you do not state the nature of the information you require; whether it relates to tho adhesive materials to be employed, or the mode of using them, or to the mounts, margins, &c. The adhe sive materials have been discussed in our pages within the last year or two, and other points in former volumes. If you will state on what points in regard to mounting you desire information we shall have pleasure in assisting you. 2. Sulphate of copper is not a restraining, but a reducing agent; used in the developers, it modi- I fies the action of the iron salt, but its precise operation has not received much attention. 3. Combination printing has been fully I described in our pages, and probably will be again. You -will find a copious article on the subject in our Year-Book for 1864. It is too comprehensive a subject for treatment in this column. I Subscriber from the First.—We do not know of any powder which could be applied to the lower lip to make it come out darker I in the photograph; nor is it probable that if we did, your sitters would willingly adopt its use. On the stage, ladies occasionally use a red salve to colour the lips, which often gives an unnatural I effect, and is said to be injurious to health. One cause of lips coming out light is the practice common amongst sitters, especially I when they are nervous, of moistening the lip just before exposure. This they should be cautioned against. A touch of colour m finishing the picture will generally reduce the excessive effect of । prominence. I W. E.—The cards were delayed a few days, but had been posted I before your letter was received. W. J. A. G.—An experienced dry-plate man may succeed in getting Anxious.—The coarseness of your copy of a card picture, repro- I duced the same size as original, is not due to the kind of lens used, I but to other causes. When you copy an albuminized print you get in your negative not merely an image of the picture, but of every little inequality in its surface, and light being reflected from a thousand such inequalities will give you a coarse, meally, flat, imperfectly-defined picture. To get a good copy from an albuminized print is always difficult, and this diffi culty is increased when you copy the full size. You may, how ever, use several adjuncts to success. Roll the print well, so as to | secure the smoothest possible surface, and take care tha it is illu- I minated with light equally falling upon it from all directions, so I that its inequalities may not give catt shadows. Some approve I of wetting the print and attaching it to the surface of a piece of I plate glass, so as to get as perfect a surface as possible. Your I rectilinear lens will answer better for the purpose of copying than your stereo lens. There is no absolute rule for distance between subject and lens. Judgment must be used in relation to the special circumstances. 2. The white precipitate which you say is de posited is doubtless chloride of silver. Such a result should not take place. What sample are you employing ? Collodio-chloride pictures on opal glass are best toned before fixing; developed prints on iodized collodion after fixing. 3. The application of glycerine to a prepared wet plate as a preservative docs not answer, and will generally produce fog. If glycerine be employed as a preservative it should be prepared as described in our pages by Mr. Blanchard some years ago. In all such preservative processes there is considerable loss of sensitiveness, and some uncertainty of good results in a dull light; but the chances are against success, and, except under necessity, it is not wise to run the risk. The peculiar markings of which you send us an illustration appear like the result of blisters ; but they may have been the result of some defect in the preparation of the plate. The print sent is appa rently one from a subject not very well lighted: slower develop ment and a little more bromide would probably have been useful. If you send a negative wo may possibly help you more effectually. 2. Thanks: we will record your promise. True: tho “ stuff” to which you refer is neither worth reading nor notice. You should, if possible, get to the exhibition in Conduit Street. Wo have no doubt that examples of many of the pictures exhibited may be purchased. II. C.—Thanks; we shall have pleasure in receiving your proposed notes of your landscape experiences. C. H. Free writes to express his approval of a Relief Fund, and urges imitation of the course of “ Gum Gallic Amateur.” Thanks. S. B. Barnard.—Thanks for your interesting letter and admir able cabinets, which arc excellent in photography, as well a interesting in subject. The portrait of “ Oliver Cromwell ’ ’ affords । a singular illustration of the persistence of types, and are full of । interest. Your suggestion for a mixed album for cards and cabi ¬ nets is a good one, and we will try to give it effect in the righ quarters. We quite agree with your view’s on the question of touching, both as to its scope and legitimacy. We shall refer to your letter again. I H. H. H.—Herr Grasshoft’s work on Colouring is only published ih I German: the publisher is Louis Gerschell, Berlin. I Several Correspondents in our next.
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