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The photographic news
- Bandzählung
- 6.1862
- Erscheinungsdatum
- 1862
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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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- http://digital.slub-dresden.de/id1780948042-18620000
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- Bandzählung
- No. 183, March 7, 1862
- Digitalisat
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Zeitschrift
The photographic news
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Band
Band 6.1862
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- Register Index 619
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Band
Band 6.1862
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- Titel
- The photographic news
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Mauch 7, 1862.] THE PHOTOGRAPHIC NEWS. 119 1862. io him® lie namt an wot hout of buildin’ 3 thoug, Regar it wool han wad eft in tl ■ able 1 that tb lay; W ild be i that th ussed * ided tin' n in t xhibitig I in t nitteef it. Jame furtb he sect’ g of t 1, 1862. I erdam ow bw works re rt. Tb 9 chibi an Ei idicati tor, wi proof 0 ' nation % receive frame 0 . bytl the e re to s0 i a no" noved W last asion • it fac‘5 ireot o' 1 ' rocess, on by,, chlorid, loride 0 remat" lek lin” prepar® Ealfpr pearad" ■ out t n foil 0 * e colot" i certo" lei whe ist, so V manif themselves, the time they require. It seems very desirable, he adds, that a skilful and experienced chemist should endeavour to recognise the molecular actions which sensi tive materials undergo in ordinary photography and in heliochromy. At the last meeting of the Academy M. Paul Desains exhibited some photographs which he considered very suit able for facilitating the study of the fascinating science of optics. These consisted of photographic representations of the figures which the luminous ray depicts when projected on a screen, and in its passage through a crystal of one or of two axes, has undergone double refraction. The curves obtained in this manner, and which are intersections of the surface of undulation, circles or ellipses, give, in fact, a very correct idea of the path of light. The projections were given by. the well constructed apparatus of M. Jules Duboscg, in which either solar light or electric light may be employed. Signor Poll!, of Milan, has made some very remarkable experiments with a new antidote, which, if verified in prac tice, will lead to unexpected results in therapeutics. If putrid blood, or the glanders mucus, or pus, be injected into the femoral vein of a dog, general infection very soon ma nifests itself of a certainty. But if, some days previous to the operation, we administer to the dog some sulphite of soda (150 grains in five days), the animal only experiences symptoms of disturbance during the first day; it is dull, and refuses its food; but soon recovers its appetite and liveli ness. Whatever may be the theory of this phenomenon, the result is so important as to claim the attention of all hygienists, and cannot receive too much publicity. The question of copyright in photographs has lately been tested at Milan, in Italy, where Sig. Duroni, who had pub lished a portrait of King Victor Emmanuel, accused one Tuminello, of Milan, of having issued pirated copies of this portrait, and brought him before the Tribunal of Commerce, claiming damages and the destruction of the counterfeits. But the Tribunal declared its incompetence to interfere. Dike the Tribunal of Paris, it regards “photography as a, purely mechanical process, in which, it is true, the photo grapher may display more or less skill, but without ever having any right to be classed, as an artist, among those who, true professors of the fine arts, exercise mind and imagination, and sometimes genius based on the principles of art. But the photographer neither draws nor paints, he has only learned to work a machine he may have bought, and put in action certain chemical operations necessary to the obtaining a pictorial result; his mechanical labour cannot, therefore, give birth to products which may justly bo ranked among the productions of the human mind.” The plaintiff lost his cause, and was condemned to pay costs. COMPOUND LENSES FOR VIEWS. Sm,—Allow me to offer a few remarks in reference to come statements put forth at the last meeting of the North rondon Photographic Association (sec Photographic News, P88106). A member is there reported as having stated at Mr. Wilson, of Aberdeen, has “ abandoned compound an868 for landscape purposes,” and returned to the use of 8 6 combinations I and again, that he (Mr. W.) “ was giving up " the taking of the other size picture (meaning, I senB,S‘wthose plates 74X4), “ as he found they did not M °wI beg to say that this is no ^ the case, for so far lorn - r. W ilson abandoning compound lenses, I need only mention the fact, that amongst other things, I am just about sending him two more lenses of the same kind ; and as to the pictures not selling, they have never as yet been offered lor sale at all; indeed, the numerous enquiries after them have probably induced Mr. Wilson to expedite his bringing them before the public ; for I learn from him this day., that the triplet views are to be published by Messrs. Marion on the 1st of May, but he is “ anxious to have some stock of them printed before they are announced.” The member whom I have quoted must, therefore, have been misinformed. With regard to some other observations made at the same time, about the angle included in pictures of different forms or shapes. Photographers generally appear to be quite aware of the fact that by measuring the diaeional of any given size picture, they have at once the capabilities of the lens; but since the shape of Mr. Wilson’s pictures occasions the remark, I may as well state that the No. 1 triple achro matic lens (7J-in. equivalent focal length), and used for plates 74 by 4,, covers a plate 7 by 7 also, as can be seen by a picture in my possession. However, Mr. Wilson and others would seem to prefer the oblong form, independent of the convenience attending the use of the same size plate and camera for stereoscopic views. Those interested in the sub ject of the the respective angles included by the single com bination view lens, and the No. 1 triple can readily satisfy themselves by inspecting two prints kindly sent me by Mr. Wilson, taken with both kinds of lenses from the same spot, from which it appears that the picture taken with the triple contains about J more of subject or angle (definition being equal), and Mr. Wilson is led to conclude that nothing short of a 10-in. focus view lens would cover the same size plate for which he now uses the No. 1 triple. In conclusion, permit me to say a word or two about the adaptation of a particular lens, for a particular given pur pose. It is now an acknowledged fact that the triple lens is entirely free from distortion, and on that account is not only the most suitable lens for copying, but especially also for architecture, or indeed wherever a correct and faithful re presentation of the original is required. The good quality, moreover, said to be possessed by the orthographic, that when “ titled” it reproduces straight marginal lines ( other wise known to be a lens reproducing all straight marginal lines pincushion shaped) is truly a fallacy, for a little con sideration will render it obvious, that when thus used, all marginal lines on the lower half of a plate, will be more idistorted (leaning inwards) than when taken with any other form of lens, and that it is only in the upper half of the picture where any amelioration takes place. Apologizing for the intrusion in your space—I remain, Sir, your obedient servant, J. H. DALLATEYEE. 19, Bloomsbury Street, March 5th, 1862. Aqotographir Zlotes anti Queries. The Alkaline DrY Process. Sib,—In conformity with the wish of Mr. Young, I hope you will grant me a short space for a few remarks about the alkaline dry process. I do not think that the markings E. T. mentions are caused by any combination between the soda and gelatine, and I am at a loss to account for his success after washing oft - the soda, in my hands such a proceeding resulted in failure. I believe I am indebted to E. T. for a private communication (from the simi larity of the letter in the News), and he there states that he developes with pyrogallic acid, and consequently it is slower than iron development, which I have always adopted, and is, to my idea, much to be preferred ; apply the gelatine solution hot, say at least 100°, avoid scratched plates, use rapid iron development, and intensify with pyrogallic acid, and I think the finest results will be obtained. But I feel sure that others must have tried it, and I hope they will come forward with their experiences, and not pre judice a process, like a gentleman did a few weeks back, in the News, when he stated (with regard to the caramel Fother gill process) that he did not think that caramel could have any accelerating effect on a Fothergill plate, I have tried it over and over again, and I say that it does, have proved it, and recom mended him to try it and dispel his doubts. I have another treatment for mealiness to recommend, from personal trial of its merits, viz., make your sensitizing paper bath alkaline and tone without the intermediate acetate bath as usual.—I am, sir, yours respectfully, War. Bartholomew. Farcham, Hants, March 1st, 1862.
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