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The photographic news
- Bandzählung
- 35.1891
- Erscheinungsdatum
- 1891
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- Englisch
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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. 1726, October 9, 1891
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Zeitschrift
The photographic news
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Band 35.1891
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698 THE PHOTOGRAPHIC NEWS. [October 9, 1891. From our Parisian contemporary, The Photo Gazette, we learn that Mons. Jaret, a lens manufacturer, has made an instrument, which he calls a “ Teleo-objectif,” to accomplish the purpose which we have been considering. This is, as its name implies, of telescopic form. It is furnished with a rack-and-pinion for focussing, and it conveniently screws on to the ordinary photographic lens. In addition to the diagram of the instrument, which is given in the publication referred to, there are also shown specimens of what it will do in the shape of collotype reproductions from two negatives of the same subject. One professes to be taken under normal con ditions—that is to say, with an ordinary camera and its unaided lens—while the other pretends to be due to the Teleo-objectif ; but both pictures are said to have been taken from the same point of view. The first is a general view of a public garden, in the centre of which is a statue so distant that in the picture it measures only half an inch in height. In the other picture the statue takes up the entire space, little else being visible. We were at first struck with the excellence of these results, but careful examination soon showed us that the second picture had not been taken from a distant point as stated, but that the lens which produced it must have been within a few yards of the object. The picture itself bears evidence that this is the case; for instance, in the normal photograph the statue is backed by foliage which is as high again as itself. In the enlarged example the top of this foliage comes hardly above the knees of the figure. Our opinion is also corroborated in another way. The statue stands on a square pedestal, with one of its corners towards the camera. In the distant view the top and bottom mouldings of this pedestal are horizontal lines ; but, in the enlarged view, those lines converge to points so near at hand that it is evident that the lens which reproduced them must also have been in close proximity to the statue. It seems a pity that, if examples of this method of working are published, they are not of a genuine nature; but with these particular photographs we need not farther trouble ourselves. Our object has been to point out a means at the disposal of the photo grapher which may be adopted under certain circum stances, and which, at any rate, may form the basis of interesting experiments. London and Provincial Photographic Association.— October 15th, first lantern night; October 22nd, ordinary meeting. Visitors invited. Anschutz Studies.—Messrs. Adams & Co. ask us to draw the attention of our readers to the fact that they have made arrangements whereby they will shortly have on exhibition, at 26, Charing Cross Road, the whole of the interesting collection of photographic studies by Anschutz. These consist of over 1,000 prints, some of which are considered to be the most marvellous examples of instantaneous work yet produced. The series comprises men running, soldiers marching, dog running, horse leaping, bird flying, man jumping, camel running, &c. The exhibition will be free, and open to the public from the 12th to the 17th inst. inclusive. ELECTRIC CURRENTS IN DEVELOPMENT. BY COLONEL J. WATERHOUSE, S.C., ASSISTANT SURVEYOR GENERAL OF INDIA. The annexed record of some rough experiments made in the laboratory of the Photographic Society of Great Britain and elsewhere during my stay in Europe may be of interest. These experiments place the existence of electrical currents during development beyond all doubt, though it still remains to be seen to what action the currents observed are really due, and what part they take in the production of the developed image. They also clearly show that the currents are in some way intimately connected with the action of the developer on the altered silver bromide, and are not merely due to the decomposi tion of the developer. It seems probable, too, that they may in some measure be due to action between the moisten ing fluid and the developer. I hope to be able to go more fully into the question after my return to India. 28th September.—Photographic Society's Laboratory. 1. Edwards’ ferrous oxalate developer. Sky and fore ground subject. Thomas’s landscape films. Current, 1o v. towards the foreground or less exposed end of the film. 2. Same film and subject. Developer: 2 grains pyro with sulphite, 2 grains bromide, 2 minims ammonia to the ounce. The current went up very slowly to about 3. v. towards the sky end of the film. 8. Same film, half exposed and half unexposed, in the same developer gave about half the above current in the direction of the exposed side. 4. Same film, more exposed than before, gave a current about double (2), or 26 v., towards the exposed side. The poles were then reversed, and the current was slightly stronger and still towards the exposed side, though on the other side of 0 on the scale. 5. Another strip of same film as last in fresh ferrous oxalate developer gave a current of about do v. towards the exposed side. 6. Another strip of same film in Edwards’s hydroquinone developer. The current was at first small in the direction of the unexposed side, about r}o v., but after exposure of the film to the air the needle took a strong impetus in the same direction, and showed a reading of about 2r v. On changing poles, the current remained still in the direction of the unexposed side. When the silver plates were dipped in the developer there was only very slight current. 7. Another slip of same film as Nos. 1 and 2—sky and foreground—in same hydroquinone developer. The needle at once showed a reading of 26 v. towards the sky side, and remained steady during the first stage of deve lopment. After exposure to the air and more develop ment the needle went back to about 40 v., and then remained steady. Further exposure to the air took the needle forward again rather beyond its first point, but it went slowly back. When the foreground side was lowered further into the developer the needle went back towards that side. There was a good deal of deposit over the foreground side of the film. 8. Thomas’s extra-rapid film, half exposed and half unexposed, in same developer. The needle remained quiescent at 0 for some time ; but after the film had been exposed to the air, it marked about 20 v. towards the unexposed side ; but afterwards went back, and showed a slight current towards the exposed side. Lowering the exposed side further into the developer sent the needle on in that direction. Lowering the unexposed side reversed
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