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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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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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JANUARY 19, 1883.] THE PHOTOGRAPHIC NEWS. 45 absorption-bands are so considerable that they can be per ceived.’ ’ This doubt, however, does not affect the rule supposed but merely its experimental verification. The supposition,’ then, is permissible that, in the same way as with liquids, added media also affect the position of absorption-bands in the case of gases, and that in this case, as in the other, displacements of certain bands occur, while the position of others remains unaltered. When, therefore, in sun-spots, certain iron lines suffer a dis - placement, and others in the same place do not, the cause is not motion, but the admixture of a foreign, strongly dispersive gas, which acts on the displaced lines, and not on the others. It follows from this, further, that curvatures of absorption lines of the sun-spots need not by any means be always explained as due to motion of the absorbing gases in the direction of the line of observation, but only where all lines of a matter partici pate in the curvature. , 1 hat bright lines of a luminous gas, also, in like circumstances, ‘by admixture of another non-luminous vapour, or one giving a continuous spectrum,” may suffer a displacement, Kundt has already shown. Uorrespondente. PHOTOGRAPHERS’ BENEVOLENT ASSOCIATION. Dear Sir,—May I ask the favour of insertion of this letter in your next issue. Our annual meeting will be held at 181, Aldersgate Street, on the 24th inst., chair to be taken at 8 p.m. by W. S. Bird, Esq. The past year has seen some progress in the Association, and to ensure per fect success I earnestly ask the assistance of all in carrying out the objects of the Association, which are “ to assist members, their wives and children, when in distress through sickness, death, or want of employment, by means of im mediate grants of money, to grant annual pensions to aged members, and to aid the unemployed in obtaining situa tions.” All members that can do so are earnestly requested to attend, and non-members are most cordially invited to the meeting.—Yours truly, H. Harland, Sec. Aroceedings 0f Societies. Edinburgh Photographic Society. The third ordinary meeting of the current session was held in 5, St. Andrew Square, on the evening of Wednesday, 10th January, Mr. Norman Macbeth, R.S.A, in the chair. The minutes of the December meeting having been signed, Mr. R. Smith Brown was elected an ordinary member. The Secretary intimated the receipt of a letter from Mrs. Dobbie, acknowledging receipt of extract-minute of sympathy and condolence, also the following presentations to the Society :— 1. “ Madeira Spectroscopic”—a very handsome volume— illustrating most laborious and painstaking investigations, by Professor Piazzi Smyth. 2. The “Year-Book of Photography,” and the “British Journal Photographic Almanac,” by their respective Editors. 3. A fine carbon print, tastefully mounted, being a photo graphic group of the members of the Society attending the annual excursion at Dirleton, by Mr. M’Ghie, of Glasgow. 4. A number of Messrs. Cussons’ Pocket Almanacs, for distribution. Mr.S; TAMKIx read a paper on “ Dry Plates and their Develop ment (see page 38). it was illustrated by a number of nega tives and prints, and advocated, under certain conditions, the use of alkaline pyrogallic development without restraining bromide, thus supporting Mr. M'Kean’s contention that the latter is not necessary, but. tending to show that the addition of bicarbonate to the ammonia was needless. Mr. McKean, on being, called on to reply to Mr. Tamkin, and thus continue the discussion deferred from last month, said :— “I regret that Mr. Tamkin has not given us a practical demonstration of his method of using my developer alongside his own, as there would thus have been a better opportunity of judging of the merits or demerits of either. I am somewhat surprised that so simple a formula should have failed in the hands of such an expert as Mr. Tamkin, though, on close in spection, I think he has succeeded better than he imagines; for on examining the negatives furnished to illustrate the paper just read, those restrained by bromide are more brilliant than those developed by bicarbonate of soda as a restrainer ; in other words, the lights are more dense, and the shadows consequently more clear. Now this is the very point at which I claim to have made an improvement. No one will deny the danger of over doing the high lights when using bromide as a restrainer, unless the quantity of pyro be very nicely adjusted. Watch the progress of the two developers while instituting a comparison; the high lights of the negative developed with the use of bromide seem to penetrate the whole thickness of the film before justice is done to the detail in the shadows—this, at least, has been my experience—but with the bicarbonate developer density and detail come together, consequently a softer and more harmonious picture is the result. Unless for copying line engravings, or anything requiring great density and clear shadows, I do not think it probable I shall ever again have recourse to bromide in the developer. Speaking of the ‘ feeling of uncertainty which naturally takes hold of one before applying the developer,’ Mr. Tamkin says no uncertainty need exist; and in this I agree with him when, as in his case, commerccial plates are purchased by the gross direct from the maker, though amateurs and others who procure them by the dozen will agree with me, that there is too often cause for reflection both before and after development. Mr. Tamkin finds two grains of pyro instead of three sufficient to develop his plates. I use a three-grain solution, but in practice I develop'two plates with the same : had he used a three- grain solution as advised, I believe his opinion of the bicarbonate would have been more favourable, and he would at the same time have saved the price of the pyro, by discarding the bromide. As to keeping notes of the various exposures and other details to guide in the development, I find one or two drops of the bi carbonate and ammonia in the pyro solution will tell more in a second than could be written down in a minute, and this just at the moment when the information is most needed, and servicable. " Mr. Turnbull said he had not had a sufficient experience to express a weighty opinion on the bicarbonate developer, but with the plates he had used, he had found that though they were not subjected to a prolonged action of the developer, yet green fog was prominently manifested; but with the ordinary developer restrained with bromide, these plates were quite free from that defect. * Mr. Avion remarked that since Mr. M’Kean published his formula he had been using it constantly, and found that it reduced his exposures about one-third, which is a very decided advantage, the negatives containing more half-tone than by the use of bromide, particularly if the exposure is slightly under It however requires stronger pyrogallic to obtain sufficient vigour. In answer to Mr. M Kean’s query as to how Mr. Tamkin would remember the exposures given on a busy day if the developmen t was deferred, the latter replied that it was his practice to time all exposures to suit one mode of developing; but when (as occasionally will happen) this rule has to be departed from, and the plates put aside for a time, he had a very simple way of refreshing his memory if necessary. The plates, when taken out of the slides, are placed one above another, with a piece of paper between, in one of the ordinary pasteboard boxes, a size larger than they are sent out in ; if all the exposures have been according to rule, no notes are required, but if an exception has been made, a small reference to it is made in pencil upon the paper lying upon the plate, even one sign sometimes being quite sufficient to remind one of all the circumstances necessary to remember. Mr. Tamkin was asked a number of questions in reference to the pictures taken by gas-light, which elicited, among other, the following information. The interior where he is seen sitting was exposed in all about forty minutes; he sat thirty-one minutes, and then left his seat, removing the white objects, and allowing the exposure to proceed for a short time. In the fully- exposed interiors the same ’plan was adopted; about three- quarters of an hour’s exposure was given, the supper table was then cleared, and other prominent white articles removed or ob scured, and the exposure continued for other three-quarters of an hour. There were here three gas-burners lighted, and a total exposure of thirty minutes, according to Mr. Tamkin’s calcula tion, would have been sufficient had an unrestrained developer
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