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The photographic news
- Bandzählung
- 27.1883
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- Bandzählung
- No. 1272, January 19, 1883
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The photographic news
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Band 27.1883
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- Titelblatt Titelblatt I
- Register Index III
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Band 27.1883
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46 THE PHOTOGRAPHIC NEWS. [JANUARY 19, 1883. been used. The moonlight view taken by Mr. Moffat was done with Dallmeyer’s, rectilinear. The Secretary stated he had received a note from Mr. M’Laren, of Larbert, who could not be present, intimating that in his experience the bicarbonate developer was not suitable for Wrat- ten’s plates. He says : “ I followed the instructions with as much care as if the fate of Ireland depended on it ; then knowing that the correct exposure was about twelve seconds, I exposed three pairs of plates. 1 and la for 5 seconds 2 „ 2a „ 8 » 3 ,, 3a ,, 12 » 1, 2, and 3, I developed with the bicarbonate, and the result was in each case more or less a failure. No. 3 was best, but was poor, wanting in crispness. Each gave signs of under-exposure, and I forced them until they began to veil. No. 1 was badly fogged. I then developed la, 2a, and 3a, with my ordinary ammonia and bromide solution—the result was in each case greatly superior to its neighbour. This developer will most probably succeed with plates which will stand a large dose of ammonia. I cannot complain of “ weak half-tones and exagge rated high lights.” If I get a negative of that description it is my own fault, and I remedy it by giving a longer exposure, and using the pyrogallic in moderation. In reply to remarks made and questions asked by members present, Sir. Tamkin said that the negatives taken to test the relative properties of Mr. M'Kean's and Wratten's developers were exposed in a bad light. The experiments were made with every desire to give the former all fairness; and with this end in view Mr. Frank Moffat was asked to develop the one plate, while Mr. Tamkin did the other, so that their peculiar characteristics might be observed side by side. He called attention to the curious fact that, while the fuller exposed plate developed much more rapidly with M'Kean’s than with Wratten's, the reverse was the case when the exposure was reduced. In regard to using an unrestrained developer, he only recommended its use where ordinary means were likely to fail, but thought at such times to use ammonia alone (with pyrogallic) was preferable to using a substitute for bromide, as, when extreme rapidity was desired, the absence of the restrainer allowed you to give the shortest exposuie. Mr. Bashford said that he supposed the diversity of opinion probably arose from the dissimilar qualities of plates by different makers; he had found with the plates he was using, that the simple bicarbonate developer recommended by Mr. M'Kean failed to produce a sufficiently plucky negative; there was a slight veiling of the shadows without a corresponding increase in the high lights to ensure brilliant prints ; but by adding a small quantity of ordinary bromide and ammonia, stock solution (Swan’s formula), this defect was remedied, and the exposure shortened. The image with bicarbonate was on the surface of the film, and was much more transparent prior to fixing—more resembling in translucency a plate developed with sulpho-pyro gallol. He was much struck with the gas and moon-light photographs exhibited by Mr. Tamkin, the former fully proving that with some most sensitive plates the presence] of bromide in the developer is not necessary, thus placing a wonderful power in the hands of the skilful photographer, enabling him to secure negatives under conditions by many deemed impossible. Mr. Nobman Macbeth, R.S.A., in proposing a vote of thanks to Mr. Tamkin, said that he felt indebted to him, to Mr. M'Kean, and others who had taken part in the discussion, and he was glad to see in the photographic press that the subject of developers was still brought into prominence, as he felt that any progress yet to be made was most desirable, and conse quently most likely to be in that direction, and any contributions by thoughtful, painstaking experimenters are valuable as aids to progress. A vote of thanks was passed to Mr. Tamkin. A hearty vote of thanks to the donors of the various presenta tions was accorded, also to Mr. Dougal for having so kindly and fully undertaken the duties of Interim-Secretary recently. The proceedings then terminated with thanks to Mr. Macbeth for presiding. London and Provincial Photographic Association. At a meeting of the above, held at Ihe Mason’s Hall Tavern, on Thursday, the 11th inst., Mr. W. E. Debenmam in the chair, Mr. C. G. Collins, referring to the plate-box shown by Mr. A. Cowan at the last meeting, said he had constructed one somewhat similar for Mr. Bedford for holding large plates albumenized ready for coating with collodion; instead of the plates being separated by narrow strips of cardboard at each end, small pieces were placed under each corner. Mr. W. Barker objected to the use of cardboard as being likely to injure the plates, on account of the various substances used in its preparation ; he gave the preference to chrome yellow paper, and had found no deterioration in plates so kept for two years. Mr. Collins said one maker packed his plates with thin sheets of paper coming not quite to the edges between them, and no deterioration had been found in plates thus packed after two years’ keeping. Mr. A. Cowan suggested that, if cardboard was found objection able, thin strips of celluloid, ebonite, or bone might be used equally well for the purpose. Mr. A. J. Brown was at a loss to understand why plates, when the air was allowed to circulate freely, did not spoil by keeping ; while if they were well wrapped in paper, they deteri orated at the edges. Mr. DEBEXEaN thought it might be caused by air impregnated with gas. He preferred to use boxes. Mr. Collins had recently opened some plates which had been placed some considerable time in saw-dust and lead; the plates were generally perfect in the centre, but the edges were black, the discolouration gradually spreading inwards. Mr. Golding had found yellow mill-board render plates insensitive. Mr. W. H. PnESTWiCI showed some pieces of paper illustrating thefilagrain process of Messrs Brown, Barnes, and Bell. A discussion then ensued. Mr. Barker said the effect could be produced by having a paper or thin cardboard prepared of waterproof paper with a softer sample on one side; when this was wetted, and subjected to pressure, the softer portion yielded more than the other, letting the light of the picture correspond to the depression, as in the specimen under discussion. He showed some paper marked by pressure with various designs, and said that some specimen designs on paper, by a process called filagramme, were on view at the Printers’ Exhibition of 1881, and he suggested that fila- grain might be the same process with a slightly altered name. Mr. Henderson showed a negative of a statue taken with a pinhole stop without a lens by electric light, referred to by him at a previous meeting. The light used was an arc, and was dis tant from the statue 5 feet 9 inches, the distance between the camera and the statue being 5 feet 3 inches ; the exposure was forty-five seconds, and the negative was under-exposed. He also showed a print from a negative taken by a Mr. Taylor (an amateur) out-of-doors without a lens, the exposure for which was five minutes. He (Mr. Henderson) had obtained his best results with a small hole carefully drilled at right angles to the plate by a Southampton optician. Mr. Haddon thought the hole was best made through a piece of charred paper. Mr. Smith said a clear, circular hole could be got by passing an electric spark through a piece of cardboard or paper. Mr. Coles had traced the cause of the spots in the negative shown by him at the last meeting to small specks of iron rust, which had settled on the plate, which, being dissolved by the acid in the solution, had produced perchloride of iron, which had bleached the spots. Halifax Photographic Club. The usual monthly meeting was held on January 9th, the Pre sident, Mr. J. B. Holroyds, in the chair. After the minutes of last meeting had been read— Mr. W. C. Williams was called upon to give the second part of his paper on “Photographic Enlargements, including Views, Portraiture, &c.” The first part of the paper was devoted io the qualifications all should possess who hoped to succeed with en largements, the qualities necessary to a proper negative, and the size and class of negatives best fitted for the purpose in views, the lighting and study of composition, and the esthetic side of the question. In the second part he fully described the best form and arrangement of enlarging camera to obtain an even and subdued light. Ho placed a ground glass one yard from the gas or other light used for illumination ; he took a transfer on carbon tissue, which always has a fine even texture, which, with careful manipulation, prevents stains and other defects; fine cloud and other effects can be introduced and printed in, and such modifications made in the picture as sunlight and moonlight. He showed a beautiful negative, 5 by 4 (enlarged to
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