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The photographic news
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- 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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Band 27.1883
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November 16, 1883.] THE PHOTOGRAPHIC NEWS. 733 so doing, had taken out some of the names which Colonel Wortley would perhaps have liked to hear mentioned ; he had not pre tended to give more than a mere outline of the progress of the art, but nothing would give him more pleasure than to have a discussion on the paper. The Chairman said that as it was usual on the present occasion to close the meeting earlier than usual, to enable the members to walk round and examine the pictures before the Exhibition closed, it would be necessary to adjourn the discussion of the paper to a future occasion. He also said that the first business attheirnext ordinary meeting would be adjourned discussion of Mr. Spurge’s paper read at their meeting in June. The meeting was then adjourned to Tuesday, 11th December. London and Provincial Photographic Association At the meeting of this Society, held on Thursday, the 8th inst, Mr. W. E. DEBENHAN in the chair, Mr. J. Traill Taylor delivered a lecturette on Photographic Lenses. He commenced his lecture by speaking of the functions of lenses, and then proceeded to describe the method and rules by which the curves are computed in order to give a lens of definite focus irrespective of its form. Optical glass and its defects were spoken of, and examples of defective lenses sub mitted for inspection. Several tools for grinding lenses of various curvatures were exhibited, together with a large collection of glass discs in various stages of progress, from the first rough grinding to the highly polished surface obtained from the factory of Messrs. Boss and Co. The details of polishing and edging were described, and a complete series of the various grades of emery employed in the several stages in the career of a lens was handed round for examination. By diagrams on the black board the lecturer illustrated the forms of the various kinds of lenses, and explained their special influence on rays. In this way were shown the meaning and effect of positive and negative spherical aberration. Chromatic aberration was explained in like manner, and a ray was projected first through a single lens, and then through one that had been achromatized, showing in what manner the latter effected the recomposition of the decomposed ray. Speaking of the optical centre of a lens, he said it was not from that centre, as hitherto popularly supposed, that the focus of a lens or a combination of lenses had to be measured, but from another point, near to it, known as the Gauss point, a know ledge of which exercised the greatest possible influence on the construction of lenses. Mr. Taylor then drew a di gram showing in what manner the two Gausspoints of a bi-convex lens were ascertained, and exhibited a sheet on which was drawn every form of lens with their optical centres and Gauss points indicated. The subject of distortion was then treated of, and its nature, cause, and method of prevention entered into. By means of a diagram he showed the evolution of a perfect non-distorting lens of the “rapid” class from a primitive double convex crown glass lens. The influence of density of glass, together with that of thickness, was explained and illustrated by diagrams. The construction and peculiarities of a portrait combination, and the influence of the back lens, with its excess of negative aberration, were described. He showed by what means a very rapid por trait lens (a No. 3 carte) was made to include an angle of 130° by means of pivots at the optical centre, the plates being shot across its axis during the rotation of the lens, in the manner of the pantascopic camera. The lecturer concluded by requesting careful examination of the valuable exhibits on the table kindly lent by Messrs. Ross and Co. for the occasion. In reply to questions, Mr. Taylor said that experienced workmen could detect strife ; that the time occupied in vitrifying a pot of optical glass would be four or five days ; and that it would take about three weeks to make a cabinet lens from moulding to the final polishing. In reply to Mr. Henderson he said, examining one of the pair of lenses some time ago, he found it very yellow; subsequently it was ascertained that this particular lens had been employed for some time in a solar camera. Removing discoloured balsam was an easy operation if conducted with care. After removing the lens from its cell, it should be lowered into a water bath just hot enough to be comfortably borne by the hands. A few minutes’ immersion suffices, when the lenses may be separated by sliding the upper one gently off; these are next cleaned either with old collodion, ether, or benzole, using papier Joseph as a rubber ; fresh balsam is dropped on one lens, and the other is pressed on it, thus repelling the excess and air as well. Mr. E. Twiss was of the opinion that oils and varnishes became bleached in sunlight, not darkened. Mr. F. York said Canada balsam possessed the property of darkening in exposure to light, not bleaching ; the flint in opera glasses soon became discoloured. In reply to a member, the Chairman pointed out that dis colouration was of two kinds, one which may be said to be super ficial, and the other in which the colour goes through. The former can generally be removed by friction with putty powder, the latter not so. A hearty vote of thanks was accorded to Mr. Taylor for his interesting lecture. The next lecture will be delivered by Mr. A. L. Henderson, on “ Ceramic Enamels.” Glasgow Photographic AssocIATTON. The third general meeting of this Association was held in the Religious Institution Rooms on Thursday, the 8th inst., Councillor Robertson in the chair. The minutes were read and approved. Mr. Parker proposed that Mr. Norman Macbeth, R.S.A., be elected an honorary member of the Association; this was seconded by Mr. McLear, and unanimously agreed to. At the request of the Chairman, Mr. Parker described the process by which he made the transparencies which gained the prize in the recent competition. He said : “There is really nothing in the process I used that is not familiar, I should think, to every member of the Society. Such as it is, however, is as follows:—1st. As to taking the impressions, these are all done in the camera, as my negatives are all large, so that I cannot print the transparency by superposition. I h ,ve to reduce in all cases. The method of reduction is nothing new, and has been described a thousand and one times in the photographic journals. I use daylight; but artificial light might, of course, be used. 2nd. I use the ordinary wet plate and silver bath. The bath decidedly acid, thecollodion old, or at least with any iodine, so as to secure clean, clear shadows ; rapidity, of course, is quite a secondary matter. 3rd. I develop with the ordinary iron and acetic acid, but to this I add two or three drops of Carey Lea’s collo-restrainer, some of which I made eight or ten years ago, and which I have still. This is really the only thing to note in the whole process. 4 th. Fix with cyanide of potassium. 5th. Tone in the ordinary acetate of gold bath as used for paper prints, but with a little addition to the proportion of gold. Of one thing I was specially careful, to use uo negative with dense deposits on the lights, as on foliage, &c., which always produces a snowy effect, which, I think, is to be carefully avoided, whether in transparencies or paper prints. ” A number of coloured photographs were exhibited by Mr. Rowan, as agent in Glasgow for a French firm who patented the process in Britain this spring. They were much admired and the Chairman thanked Mr. Rowan for his kindness in show ing them. A number of magic lantern slides, lent for the occasion by Messrs. York and Son, illustrating towns and places of interest on the Mediterranean, were then shown on the screen, and were explained by the Secretary reading a descriptive paper, which accompanied them. A vote of thanks was heartily accorded to the Messrs. York for their readiness in complying with the request for specimens of their work, and also to Mr. Swan, who exhibited the slides, and to the Secretary. The meeting, which was composed of members and friends, was very large, and was brought to a close by a vote of thanks to the Chairman. Edinburgh Photographic Society. The twenty-fourth annual meeting of the Society was held in 5, St. Andrew Square, on Wednesday evening, 7th November, Mr. William Neilson occupying the chair. The Secretary read the minutes of last annual and ordinary meetings, which were approved, and the following were un animously elected ordinary members of the SocietyMessrs. Erskine Steele, W. A. Hyslop, R. A. Proctor, Alex. Lawrie, Edmund Jarman, Wm. J. C. Barry, David Harvie, Andrew Hunter, and Miss Ellen Hennell. The Secretary submitted the following report for the year ending October 1883. The Council, in presenting twenty-fourth annual report, have pleasure in congratulating the members on the continued prosperity of the Society. It is with much regret the Council have received intimation that through the serious indisposition of our esteemed President,
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