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The photographic news
- Bandzählung
- 7.1863
- Erscheinungsdatum
- 1863
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- Englisch
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- F 135
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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. 256, July 31, 1863
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Zeitschrift
The photographic news
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Band
Band 7.1863
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- Register Index 619
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Band
Band 7.1863
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July 31,1863.] THE PHOTOGRAPHIC NEWS. 371 Engineer. July 21th, 1863. Aqotographic Zlotes an Queries. to see what effect it would have, but have not had time to try ; Diston, of Leven, Fife, three subject p but shall bo happy to lot you know, if you think it worth camera, which display very considerab pictures produced by the camera, which display very considerable artistic power. The enlargements from card pictures to whole plates, which were produced with scarcely the least appreciable loss of any kind, either in definition, delicacy, gradation, or vigour. Mr. Heath, after very long experiment in the enlargement of negatives, has come to the conclusion that the most perfect result is obtained by obtaining first a good, well-detailed transparency, using iron development, and, from this, a negative, by weak pyrogallic acid development. The perfectness of the results very emphatically recommend the method. Art Photographs.—Wo have received from Mr. Adam knowing. Perhaps some of your numerous readers can enlighten me on this subject.—I am, dear Sir, yours faithfully, Dennis Wright, Captain 109th Foot. Kurrachec, Said, June 9,1863. June 20.—I have since tried the bath, and find it is not the slightest better now than before. [We cannot seo any possible action in ebonite which could render the bath acid; nor, if it had done so, could the same solution have worked properly at once, without any rectifi cation, when placed in another vessel. We have had a silver solution standing in an ebonite bath for upwards of twelve months, without being in any way injured.—Ed.] bonate of lime, shook well, and let it stand for several days. The paper was the thin paper of Messrs. Murray and Heath. Into 35 ozs. of distilled water I filtered 1 [ drachms of the lime solution, and then added 2 drachms of gold. This I used ' twenty-four hours after mixing. 1 cannot tell the strength of my silver bath, as it was one I have had in use some time. The prints were a little over-printed, then well washed, put into the toning bath one at a time, with only just sufficient to cover them, and the result was most satisfactory, and has put an end to all my troubles on this head. My time is so fully occupied professionally at present, or I would send you some proofs to look at, but as soon as I am a little more dis engaged I will do so, that you may see I do not over-rate my success.—I am, dear sir, yours truly, Ebonite Baths. Dear Sir,—Having long been a subscriber to your News, I take the liberty of addressing you regarding a subject which may prove beneficial to others. Seeing ebonite so highly spoken of for baths, I immediately sent home to one of the best houses for a bath. I have had it now in use for two mouths and more, and have always found that after my bath had been in for a couple of days I could never take a good picture. I saw it had all the appearances of acidity, but could not make out how it had got acid. This morning being a particularly nice morning, 1 thought I would take some pictures. I exposed, and did everything as usual, but no negative. I immediately went to my bath and found that the acid state was enough to prevent any picture. I after emptied it out into the stock bottle, and applied a piece of litmus paper to the ebonite, it immediately turned it scarlet: I may say, this ought not to be, 1 should think. To prove there was nothing wrong with the bath itself, I put a little in a small glass bath 1 had, and instantly took everything as usual. Is this the usual Angle of View, &c. SrR,—In the last number of the Photographic News, your correspondent, "Tanno-Glycerine," asks your advice as to the form of Jens best adapted for general purposes, and also for engineering subjects, bridges, &c., where a large angle of view is required, say 60° or 65°, the size of picture wanted being 11 by 9. I ou tell him in reply that you do not know of any lens at present catalogued which will give an angle of 60° or 65° on 11 by 9 plates. Permit me to call your attention to the following extract from the Photographic News, for March 29, 1863, page 261 : “ Mr. Collis exhibited a series of fine views in Wales, taken with Koss’s 10 x 8 triple lens, on 10 X 12 plates. Also some with the lens of 8’4 focus, and some with the lens of 9'4 focus, including an angle of 60° on the base line and 66° on the diagonal. These were very much admired.” My triple lens of 9-4 equivalent focus is therefore the very lens which would answer the requirements of your correspon dent,but I suppose you had for the moment forgotten that such a lens is in existence. In fairness to yourself, to your correspondent, and to me, I must request the favour of this letter being inserted in the next number of the Photographic News.—Faithfully yours, Thomas Koss. 2, Featherstone Buildings, Ilolborn, July 28,1863. [Neither the lens nor the prints referred to camo under our especial attention for measurement or calculation ; their exhi bition at a meeting, and our incidental sight of them, wore duly reported at the time, but had escaped our further recollection. -En.] Uulk in fin Studio. RESIXIZED Collodion.—Dr. Saunders Van Loo, writing to us from Amsterdam, says ;—“ It is more than two years that I have used this collodion, and always with the same success. Since that time, no great improvements have been made in dry plate photography, except ammonia fuming, hot developments, &c. I am sure no simpler method exists than to prepare with my rcsinized collodion, plates which are simply washed in ordinary water. The chlorides present in the wash water do not give any trouble. I use always the here called “ duinvater," or hill water, which is conducted from a distance of four hours to Amsterdam through iron tubes. This water contains limo and iron salts. My plates keep fit for use for a long time ; I have exposed and developed with success plates which were prepared for several months. Therefore it surprises me that resin-collodion is not more in use. Sometimes I read in your valuable journal about trials by some gentleman to get dry collodion by adding resin to Ponting’s, Thomas’, or other good collodion sorts, yet I suppose that a photographer will scarcely succeed in this way for obtaining a suitable dry collodion. En closed I have the honour to send you a print after a negative taken in two minutes, with stopped view lens (opening scarcely half an inch). I expect that the correspondence in photographic journals would not abound in so many narratives about dis appointments in dry-plate work, if resin-collodion in good con dition was more used. [Some time last year, Dr. Van Loo favoured us with a bottle of his collodion for trial. Unfortunately, press of engagements delayed our trial for some months, and we then found that the collodion had lost sensitiveness by age, so that we were unable to do it justice in a trial.—Ed.] The Discovery of Thallium.—Mr. Crookes has just issued a pamphlet detailing the history of his discovery of thallium. With singular disingenuousness the French savans persist in attributing the discovery of the metallic nature of this clement to M. Lamy, and state that Mr. Crookes is indebted to that gentleman for his knowledge that thallium was a metal. We have before alluded to the evidence on the subject, which is most conclusive, and it is unnecessary to repeat it now. M. Lamy states that he first discovered the green lino of thallium in April, 1862, and that he isolated the metal in May, 1862, between the 2nd and 16th. Now the fact stands on uncon trovertible published evidence that Mr. Crookes discovered the line in March, 1861, isolated the clement in September, 1861, and exhibited the metal on the 1st of May, 1862, at the opening of the International Exhibition, upwards of a fortnight before M. Lamy announced his discovery of the metal. Mr. Heath's Photografiis.—Mr. Vernon Heath issued circulars a few days ago, inviting his friends to a private view to a series of portraits and landscapes recently taken for His Koyal Highness the Prince of Wales. The views of Windsor and Frogmore include some of the most charming photographs that we have seen. Amongst the many pleasing portraits of the Prince and Princess, we were most interested in the behaviour of this patent material ? because, if so, the sooner it is generally known the better. I put in boiling soda and water
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