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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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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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MARCH 9, 1883.J THE PHOTOGRAPHIC NEWS. 155 WITH ■■■MM GLASS “SOAKED” WITH SILVER FOR USE THE GELATINE PROCESS. BY CAPT. W. DE W. ABNEY.* Some short time ago Mr. Bolton kindly gave me a specimen of some soaked-silver glass which had been furnished him by a well-known gentleman in the photographic world. I am led to believe it is prepared by painting white glass with a silver com pound, and then firing it. After the first firing it has a lemon yellow colour ; but after three or four it takes the tint of the glass I show. Its appearance by transmitted light is very similar to that shown by stained orange—a glass which behaved somewhat peculiarly with gelatine plates. By reflected light the glass is very remarkable. It presents the appearance of green fog as seen on a gelatine plate, being iridescent and green. As was remarked to me by Mr. Bolton, until he had seen this flashed glass he was an opponent of the theory that I had propounded, that green fog is due to a reduced silver compound. I dare not enter into a discussion of green fog on this occasion, as I have already had my say about it. It is quite sufficient to know, at all events, some causes of its appearance in order to avoid it, and this I hold to be the true scientific method of discovery. Now as to its suitability for the developing-room. A piece of the glass was placed before the slit of the spectro scope, the lower half of which was screened, and a photograph with a gelatine plate taken. It was impossible to get the sun as a source of illumination, except on one occasion; hence the electric light was used. The first photograph I show was taken with quartz lenses to the collimator and camera, and a Rowland diffraction grating used for getting dispersion of the spectrum. By this means all the ultra-violet, even that which could not pass through glass, was impressed. It will be seen by the photograph that the rays just beyond the limit of the violet passed through the glass, and rays still more refrangible were stopped. It may be said that rays from wave-length 3900 to wave-length 3400 passed through one thickness of flashed silver, giving a very fair image. The next photograph, Fig. I., shows the action of the whole spectrum when transmitted through the flashed glass, and is compared with the action of the spectrum when the unshaded light is used. The spectrum was formed by two flint glass prisms. It will thus be seen that light is transmitted at both G. LERL and Sons, for “ Improvements in their patent extensible frames for photography.”—Dated 19th July, 1882. Patent Granted in Germany. 21,580. P. RoUAIx, of Paris, for “An apparatus for obtaining photographs without a camera obscura.”—Dated 17th August, 1882. Class 57. .. Patent Granted in America. 272,173. WILLIAM Thomas, of New York, N.Y., for “ A photo graphic camera.”—Application filed 10th November, 1882. No model. bL ends of the spectrum, which has an action of a gelatine plate. | With an ordinary collodio-bromide emulsion plate, the only deleterious light is that in the ultra-violet; at the least re frangible end the light has no effect. It may be interesting to show the absorption that takes place in ordinary sheet glass. Fig. III. shows the absorption, using a grating, since glass prisms would be inadmissable ; the spectrum being taken by quartz lenses which, Dr. W. H. Miller and Professor Stokes showed, transmitted all the ultra-violet rays. I think it may be well to remind my hearers that there is no advantage in using quartz lenses for the light they have to deal J with. The solar spectrum ends almost at the same point as where absorption by glass in the ultra-violet commences, even at the highest elevations. This cutting-off of the spectrum is apparently not due to our atmosphere, but to something outside it. Another photograph shows the effect of two thicknesses of the soaked-silver glass (dotted curve, Fig. I.), by which it will be seen that almost all the ultra-violet light is cut off, and also rather more of the green towards the red. The next photograph I show is a com parison between the thickness of this glass and g-inch thickness of a weak solution of bichromate of potash • Read before the Photographic Society of Great Britain. (Fig, II.). This last photograph was taken on a collodio-bromide plate of green bromide which 1 use for the infra-red region. It will be seen that with the bichromate the violet band is entirely absent. 1 find that the low rays are nearly as readily transmitted through the flashed glass as through the bichromate ; there is a slight absorption, but not much. I was led to examine whether the non-reflection of certain rays in the ultra-violet by silver had any correspondence with the light transmitted through this compound of silver. Fig. V. shows where silver fails to reflect, and it will be seen that it differs entirely in locality from the place of transmission through the glass. The deduction to be drawn from this is, that soaked-silver glass is unsafe to use even for collodion, if only one thickness is used ; that, in order to render it safe for gelatine plates, ruby | glass should be combined with it, to more entirely cut off the yellow and green. I exhibit a transparency printed on a gelatine plate, with an exposure of three seconds by daylight coming through this glass. The question arises, Is this the only medium i which behaves in this manner, viz., in letting the ultra-violet rays through ? It is not: through a thin solution of aurine the same phenomenon is observed; but if the solution be strong, or
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