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The photographic news
- Bandzählung
- 27.1883
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- 1883
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- Hochschule für Grafik und Buchkunst Leipzig
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Zeitschrift
The photographic news
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Band
Band 27.1883
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- Titelblatt Titelblatt I
- Register Index III
- Ausgabe No. 1270, January 5, 1883 1
- Ausgabe No. 1271, January 12, 1883 17
- Ausgabe No. 1272, January 19, 1883 33
- Ausgabe No. 1273, January 26, 1883 49
- Ausgabe No. 1274, February 2, 1883 65
- Ausgabe No. 1275, February 9, 1883 81
- Ausgabe No. 1276, February 16, 1883 97
- Ausgabe No. 1277, February 23, 1883 113
- Ausgabe No. 1278, March 2, 1883 129
- Ausgabe No. 1279, March 9, 1883 145
- Ausgabe No. 1280, March 16, 1883 161
- Ausgabe No. 1281, March 22, 1883 177
- Ausgabe No. 1282, March 30, 1883 193
- Ausgabe No. 1283, April 6, 1883 209
- Ausgabe No. 1284, April 13, 1883 225
- Ausgabe No. 1285, April 20, 1883 241
- Ausgabe No. 1286, April 27, 1883 257
- Ausgabe No. 1287, May 4, 1883 273
- Ausgabe No. 1288, May 11, 1883 289
- Ausgabe No. 1289, May 18, 1883 305
- Ausgabe No. 1290, May 25, 1883 321
- Ausgabe No. 1291, June 1, 1883 337
- Ausgabe No. 1292, June 8, 1883 353
- Ausgabe No. 1293, June 15, 1883 369
- Ausgabe No. 1294, June 22, 1883 385
- Ausgabe No. 1295, June 29, 1883 401
- Ausgabe No. 1296, July 6, 1883 417
- Ausgabe No. 1297, July 13, 1883 433
- Ausgabe No. 1298, July 20, 1883 449
- Ausgabe No. 1299, July 27, 1883 465
- Ausgabe No. 1300, August 3, 1883 481
- Ausgabe No. 1301, August 10, 1883 497
- Ausgabe No. 1302, August 17, 1883 513
- Ausgabe No. 1303, August 24, 1883 529
- Ausgabe No. 1304, August 31, 1883 545
- Ausgabe No. 1305, September 7, 1883 561
- Ausgabe No. 1306, September 14, 1883 577
- Ausgabe No. 1307, September 21, 1883 593
- Ausgabe No. 1308, September 28, 1883 609
- Ausgabe No. 1309, October 5, 1883 625
- Ausgabe No. 1310, October 12, 1883 641
- Ausgabe No. 1311, October 19, 1883 657
- Ausgabe No. 1312, October 26, 1883 673
- Ausgabe No. 1313, November 2, 1883 689
- Ausgabe No. 1314, November 9, 1883 705
- Ausgabe No. 1315, November 16, 1883 721
- Ausgabe No. 1316, November 23, 1883 737
- Ausgabe No. 1317, November 30, 1883 753
- Ausgabe No. 1318, December 7, 1883 769
- Ausgabe No. 1319, December 14, 1883 785
- Ausgabe No. 1320, December 21, 1883 801
- Ausgabe No. 1321, December 28, 1883 817
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September 21, 1883. ] THE PHOTOGRAPHIC NEWS. 605 opinion of the judges, spoilt in the mounting, being too gaudy. Mr. Lyddell Sawyer sends two pleasing out-door studies, “The Rivals” being the best. Mr. G. T. Whaite sends several frames of his well-known studies, which are well worthy of attention. Amateur Photography.—Some very interesting pictures of life and scenery in the wilds of Labrador and Hungary by J. B. Holmes have taken the first bronze medal; the manipulation is very good, considering the difficulties under which they must have been taken. Mr. J. G. Horsey sends several examples of his work, some of large size; but they are a little too black and cold, and in many instances the subject is down too low in the plate, which makes the hills appear dwarfed. We are sure that Mr. Horsey can do better work, and hope that he will profit by these remarks. Mr. T. M. Brownrigg sends a goodly number of ex amples of his work (which are soft and delicate) of Italian and English scenery. Mr. C. V. Shadbolt sends some very careful work. Mr. A. G. Tagliaferro contributes some instantaneous examples, which are very good. Mr. W. R. Ridgway sends one frame of views in North Wales, which are fairly good. Mr. C. A. Eernely, of Reigate, appears to be not so well represented as we have seen him in past years. Mr. C. Brightman again sends some of his careful work ; to frame No. 872 a first bronze medal has been awarded. Mr. P. H. Emerson sends a selection of views which are fairly good. The Rev. A. Malan has been awarded a second bronze medal for some instantaneous pictures of express trains, which are very good. This class of picture has one great feature, and that is, it gives no idea of motion. Photographic Appliances.—Mr. Geo. Hare, of London, comes off with first silver medal for his new patent camera, which appears perfect in every way, with great range of focus, and every conceivable action, as swing- back and swing-front, leaving nothing to be desired. Mr. G. W. Tweedy sends an instantaneous shutter, similar to Mr. J. P Jackson’s instantaneous shutter, only this one has four openings instead of two passing one another. Messrs. J. F. Shew and Co., of London, send a shutter also similar to that of Mr. S. P. Jackson, with a regulating screw to regulate exposure of camera; their other exhibits are of ordinary make, possessing no special feature. Messrs. W. H. Oakley are rather strongly repre sented in regard to lantern appliances; their model of portable lantern screen is a capital arrangement, and the judges recommend it to the special attention of lanternists. They also send a very portable and ingenious reading lamp, which seems very perfect. They send specimens of their interchangeable, mixed, or blow-through jet, which is extremely well made, the notable feature about it being, that it is fitted with a double regulation cock, whereby, when the gases are once adjusted, a screw plug can be turned, which shuts off all the gas, and then can be turned on instantly without any re-adjustment, which is a very novel feature. A second bronze medal has been awarded to this cock. They have also some good substantial camera stands. Mr. Cheney has several exhibits, viz , changing bag for dry plates, tripod stand, and lantern screen elevator: the latter does not seem very substantial, and appears far too complicated to come into general use. THE BRITISH ASSOCIATION. PaOKESSOR Cayley, in speaking from the presidential chair on Wednesday, referred to the rise and progress of pure science—of those labours in which the human intellect deve- lopes great truths, without drawing upon facts Larned from experience and observation. Those who doubt that mathematical inductions are in tuitive, and not the result of generalisations derived from experience, are thus addressed by the Cambridge Professor: “We can each of us appreciate the truth of a proposi tion in regard to numbers; and we cannot but see that a truth in regard to numbers is something different in kind from an experimental truth generalized from experience. Compare, for instance, the proposition that the sun, having already arisen so many times, will rise to-morrow, and the next day, and the day after that, and so on ; and the pro position that even and odd numbers succeed each other alternately ad infinitum, the latter, at least, seems to have the characters of universality and necessity. Or, again, suppose a proposition observed to hold good for a long series of numbers, 1,000 numbers, 2,000 numbers, as the case may be, this is not only no proof, but it is absolutely no evidence, that the proposition is a true proposition hold ing good for all numbers whatever ; there are in the theory of numbers very remarkable instances of propositions ob served to hold good for very long series of numbers, and which are nevertheless untrue.” Of late years the address from the Chair has been the main feature, and the most interesting characteristic, of the meetings of the British Association, as the communicated papers are—as a result of the existing competition among scientific men for early publication—ordinarily either un important or stale. To pause in the race of gathering together material facts, and to view the past and present of scientific research, is in structive and profitable ; especially when a man like Pro fessor Cayley leads our thoughts into those channels where his mind has been especially active. Professor Cayley says : — "I think it may be at once conceded that the truths of geometry are truths precisely because they relate to and ex press the properties of what Mill calls ‘purely imaginary objects' 1 That these objects do not exist in Mill’s sense, that they do not exist in nature, may also be granted ; that they are ‘noteven possible,’ if this means not possible in an existing nature, may also be granted. That we cannot ‘ conceive ’ them depends on the meaning which we attach to the word conceive. I would myself say that the purely imaginary objects are the only realities, the urras ovra, in regard to which the corresponding physical objects are as the shadows in the cave ; and it is only by means of them that we are able to deny the existence of a corresponding physical object. If there is no conception of straightness, then it is meaningless to deny the existence of a perfectly straight line.” In the confession of mathematical faith which immedi ately precedes this remark, the Professor boldly avows his genuine kinship to the philosopher who would allow no man unversed in geometry to enter into his school. It is, however, when the President proceeds to develop his views on those notions of imaginary magnitude and imaginary space which, as he tells us, underlie and pervade the whole of modern analysis and geometry, that we reach the most interesting and suggestive portion of his address. The conception of a negative magnitude becomes, with a little reflection, intelligible enough. It is used, as the Professor incidentally remarks, in a very refined manner in book keeping by double entry ; and from a negative magnitude to the conception of an imaginary magnitude the transition is not really very difficult. Its interpretation is another matter; that belongs to a region to which common ex perience furnishes no clue, which is penetrable by analysis alone, and which is therefore not inappropriately termed imaginary or transcendental. A similar but not identical process leads to the conception of imaginary space—of space, that is, of more dimensions than those of which experience furnishes the evidence. A pure line, length without breadth, is the type of space of oue dimension, a plane superficies of space of two dimensions, and an ordinary solid of space of three dimensions. As we certainly cau think of or imagine space of less than three dimeusions, though experience gives us no direct evidence of its existence, why should we not also imagine space of more than three dimensions, and if of
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