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The photographic news
- Bandzählung
- 13.1869
- Erscheinungsdatum
- 1869
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- Englisch
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 560, May 28, 1869
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Zeitschrift
The photographic news
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Band 13.1869
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- Register Index To Volume XIII 629
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Band 13.1869
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May 28, 1869.J THE PHOTOGRAPHIC NEWS. 255 Attorney, Amsterdam ; Dr. P. J. Kaiser, Doctor of Philosophy’ Leiden ; L. P. Van Der Boek, Captain on the General Staff, the Hague ; Julius Schaarwachter, Photographer, Nijmegen. 2. That there will bo awarded :— For tho class of Photography—Three gold, twelve silver, and ten bronze medals. For tho class of Nature-printing—Two gold, five silver, and five bronze medals. For the class of Chromo-lithography—Two gold, eight silver, and five bronze medals. Whilst, if the Jury should bo of opinion that any exhibited objects give inducement to it, more medals and certificates of honourable mention can be awarded. Tho Jury is authorised, when in any class fewer objects might be found worthy of a prize than medals have been awarded, to adjudge them in another class. Among tho medals awarded are comprised tho following, offered by private persons for peculiar subjects, as :— A gold medal for the best nature-printing of lycopodiaceae. A silver medal for the best collection of photographs of ob jects of botany from nature. A silver medal for the best collection of photographs of zoological objects from nature; such as different breeds of cattle, horses, dogs, &c. A silver medal for the best photographs of microscopic objects. A silver medal for tho best photographs of marine views from nature. A silver medal for unpublished photo-lithographs of known etchings. Particular attention will be paid, besides, at the adjudgment of prizes, to new inventions, which arc improvements in the different branches of art represented at this Exhibition. 3. That no expenses are to be paid by the exhibitors for tho space required for their objects. 4. That exhibitors who desire to exhibit their objects framed and glazed can address themselves to Mr. I. H. Kiewiet de Jonge, D. 128, Groningen, who will undertake, for a moderate compensation, to lend the frames. 5. That the adjudged medals will be distributed to those interested, or their representatives, on Tuesday, July 13th, 1869, and that the adjudgment will bo published in the Dutch and foreign newspapers. The Committee, although desirous to receive tho demands for admission before tho 15th May, as stipulated by Article 6 of tho programme, has decided, in favour of those who may be prevented doing so, that they may be sent, at tho latest, before the 1st Juno. The time fixed, however, before which the articles must bo sent, remains irrevocably the 1st July. The following paragraph especially concerns English exhibitors : — Mr. A. D. Keulemans, 1, Guildhall Chambers, Basinghall Street, London, E.C., will bo kind enough to collect and expe dite tho objects. English exhibitors, desirous of profiting by this opportunity, will have the goodness to address themselves to Mr. Keulemans for particulars. The announcement is signed by the Committee and Mr. J. D. Schutter, Secretary. INDIA-RUBBER FOR MOUNTING. BY JOHN SPILLER, F.C.S. A few days since, in turning over a parcel of photographs, consisting chiefly of stereoscopic slides, mounted by myself for examination in the binocular instrument at a time when the angle of seven degrees was considered to be necessary for the proper representation in relief of statues, and groups of objects placed at no great distance from the camera, I came upon some illustrations which furnish the most indu bitable evidence of tho failure of india-rubber paste as a mounting material. The pictures, some of which I have already submitted to the inspection of the Editor, arc nearly separated from the cardboard, and the adhesive and elastic qualities of the natural gum have perished by the conversion of the caout chouc into a yellowish-brown resin, which stains both the photograph and mount, and seems almost, as the Editor remarked, to have conduced to fading, instead of protecting the print from the contact and adverse influence of the atmosphere. Believing that the yellow stains upon these prints were due to the formation of the caoutchouc resin described by me in a paper read before the Chemical Society in January, 1865, entitled, " On the Oxidation of India- rubber,” I washed one of the proofs with alcohol, for the purpose of dissolving out the yellow resin, and found it to answer perfectly to the body containing from 27 to 28 per cent, of oxygen, which seems to be formed as the inevitable consequence of the exposure to the oxidizing influence of the air of thin films of india-rubber—a true hydrocarbon— especially when in the softened condition as left by the evaporation of a solvent, such as benzole or coal-tar naphtha. No reliance can, therefore, be placed in the use of india- rubber solution for mounting photographs, for all the proofs in my possession, treated in this way, show a tendency to become loosened from the card, even in those cases where they are not yet actually detached. 1 have by me several prints mounted ten and twelve years ago, and there is no exception to the general rule of change under these circum stances. I have, besides, seen failures from the same cause in the portfolios of my friends, who were induced, like myself, to avail themselves of the facilities offered by this otherwise very convenient mounting agent, when its use was first proposed. It is but right that photographers should be placed in possession of these facts, for it is not long since a pro posal was made to employ a coating of india-rubber for stopping the pores of paper prior to the application of albumen in the preparation of a material for use in printing. There is, besides, a suggestion to employ a film of india-rubber for the protection of negatives previous to varnishing. For myself, I am content to adhere to the use of a mixture of glue and gum arabic for all mounting purposes, as recommended in an earlier communication to your pages. With this communication I enclose a copy of my chemical publication containing the analyses. May 10th, 1869. MANIPULATIONS IN PHOTO-CHEMISTRY. BY JAMES MARTI.* The next manipulation needed after that of weighing will most probably be pulverization, or the art of reducing sub stances to powder. The instruments required are mortars and pestles. These are made of various sizes and substances, according to their intended uses. Those for pounding hard substances which do not act chemically upon metals are made of iron, bell metal, or brass, and are in the shape of an inverted bell ; others are made of marble and agate, but, at present, are seldom used, as they are acted upon by acids, and liable to be broken if used for pounding; those made of wedgwood ware arc the most generally useful, and, in deed, absolutely necessary in photo-chemistry. It is best to have more than one size; No. 3 and No. 6 will be found very convenient sizes. Pulverization is effected partly by percussion and partly by grinding. The substance to be powdered is put into tho mortar and struck or bruised with the pestle, and the pulver ization finished by grinding with a circular motion ; but the motion of the pestle ought to vary with the nature of the substance to be powdered : those which are hardened by the stroke of the pestle require to be reduced to powder by * Continued from p. 221.
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