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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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- Bandzählung
- No. 1317, November 30, 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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THE PHOTOGRAPHIC NEWS. roceedings st The Photographic Society of Great Britain. A meeting of this Society was held on Tuesday evening, Mr. Baden Pritchard, F.O.S., Vice-president, in the chair. M WE. DEBENHAM, after alluding to the inj ury to health likely u arise from working in ruby light, a subject to which Dr. Herschel had recently paid attention, exhibited a lantern fitted on its four sides with four different mediums, all of which possessed certain non-actinic qualities. No. 1 side was fitted with green cathedral glass and two thicknesses of yellow or light orange paper ; No. 2 side was glazed with red glass ; No. 3 was fitted with ruby flashed on orange glass ; and No. 4 side of the lantern had red glass and orange paper. The wick of the lamp was tolerably large, and fed with paraffin oil. A series of experi ments were made by exposing bromide plates behind a negative at eight inches from the different sides of the lantern for a period of twelve minutes. In all cases a distinct image was produced, but the image opposite No. 1 side was the faintest. Hence Mr. Debenham argued that red or ruby light—which was so prejudicial to health—was unnecessary for dark-room work, for the greenish yellow proved to be most advantageous to the photographer. The Chairman, without questioning the results of Mr. Deben ham, said that these would have been more complete if the visual light had also been tested, say by means of the ordinary photo metric screen, which consists of a disc of opaque paper with a transparent spot (produced with oil or paraffin) in the centre. If this paper screen with its transparent centre is put between lights of equal intensity, the transparency in the middle is not seen, but only when they are equal; thus the visual intensity of a light can easily be ascertained. If the visual and photographic results were both in favour of the green glass and yellow papers, then there could be no doubt as to the efficacy of this screen. Mr. Blanchard asked Mr. Debenham if he had tried silver flashed glass in his experiments ; but the latter had not done so. Mr. Bedford called attention to the fact that paper itself stopped a good deal of light, and therefore was of opinion that instead of using two thicknesses of yellow paper, if one, with more stain, so to speak, could be employed, the result would be more advantageous. Mr. Spurge wished to know if the experiments had been con ducted indifferently towards the side or end of the wick ; the former, he thought would be a greater source of light than the latter. Mr. Debenham held that the d.fference was so slight, if any, as to be of no moment. Mr. Cowan was of opinion that the inside surfaces of the mediums (those next the light) might act unequally as reflecting surfaces, and thus influence the results. Mr. C. Ray Woods pointed out that the yellow paper exercised the more important function as a non-actinic screen, as green glass permitted much of the blue rays to pass. He also questioned whether one medium could be used for bromide plates of different manufacture; he had himself recently been engaged in the pre paration of plates sensitive to different regions of the spectrum. Mr. Ashman also maintained that the principal point was the yellow light; he had that day developed a large batch of plates, without fogging, by having recourse simply to an ordinary spirit lamp, in the bowl of which common salt was dissolved to give a yellow flame. Mr. Ackland said that the sooner they could get rid of red or ruby light the better ; it was certainly inj urnous to eyesight. Mr. Valentine Blanchard instanced his own eyesight, as having suffered from red light. Mr. Cowan produced a series of negatives in proof that green fog was the result simply of unwise development, and was not inherent to the emulsion. By developing the first of a series of plates with an ordinary pyro developer, he obtained green fog ; when, however, he used ferrous oxalate, or when he employed but. half as much ammonia as pyro, and no bromide at all, there was no trace of green fog. Mr. Cocking exhibited, on behalf of Mr. II. J. Burton, a double dark slide, especially light, made of one piece of wood, and having thin metal slides ; also a triangle made up of thin bands of iron rivetted, which, while as strong as one of brass, weighed one-third less. Mr. Cowan made known a suggestion of Mr. Crup to employ as “finder” upon the camera, a rough unfinished spectacle or eye-glass. This could be obtained for a few pence, and gave LNOvEMBER 30, 1883. the photographer a capital idea of what a view was likely to be before photographing. Mr. Debenham gave notice that he would, at the next meet ing, call attention to the manner of publishing papers in the Society’s Journal. The Chairman stated that as the fortnightly gatherings could not be considered in the light of the ordinary monthly meetings of the Society, it would be the best plan for Mr. Debenham to address the Council on the subject. The meeting then adjourned. Glasgow Photographic Association. The fourth general meeting was held in the Religious Institution Booms on Thursday, the 22nd November, Councillor Roberi SON in the chair. The minutes of the last meeting were read and approved of. Mr. W. Chambers .was elected as a member. The Chairman then called upon Mr. J. G. Tunny, Edinburgh, to read a paper entitled, “A Few Notes from Maine to California.” Mr. Tunny gave a very interesting account of his eleven months’ tour on the other side of the Atlantic, and described a number of the studios he had visited. He said nearly all the American portraits were printed vignettes, and were remarkably soft, although printed in sunlight; the vignetting mask was covered with tissue paper, and was fully an inch from the printing frame. He also said there were no blinds used in the American studios, small hand-screens and reflectors being used instead ; by this means, parts of the body were either lightened or darkened as occasion required. For instance, when the shadows in the face were too strong, a small reflector about eighteen inches square was used, therefore lightening up the face, and at the same time leaving the ahadows in the dress dark and brilliant. The lecture was illustrated by a large series of views of the Yosemite Valley, taken direct on 24-inch plates ; they were remarkably fine and clear, and very much admired. The Chairman and others made remarks. Mr. Sloan asked what length of exposure was required in America as compared with this country. Mr. Tunny said it was a strange fact that although the air was very much clearer and the light brighter, the exposures were very much the same as in this country ; he could give no explana tion of the fact. Mr. Urie then proposed a vote of thanks, which was heartily accorded. A camera by Mr. George Smith, of the Scioptican Company, was exhibited and explained by the Secretary. Mr. Parker spoke very highly of the camera, and proposed a vote of thanks to Mr. Smith for sending it. The proceedings terminated by a vote of thanks to the Chair man. London and Provincial Photographic Association. At a meeting of this Society, held on Thursday, the 22nd inst, the chair was occupied by Mr. Pollard Graham. Mr. A Cowan, since the last meeting, had tested the « Cooke camera,” and found it would hold fifteen plates easily—eight in the lower compartment, and seven in the upper. He exposed two plates in the studio with a strong flood of light, but not the slightest trace of fog was present, proving the fittings to be pretty safe. If metal sheets or carriers were fitted, similar to those employed in the “ Samuel’s Camera,” or a double carrier capable of holding two plates back to back, the camera would be more useful. In the latter case, the whole fifteen plates might be exposed rapidly, one after the other, turned round and the other fifteen exposed. The present focus was 7 inches, but there was not the least difficulty in making it 12 inches. Mr. F. W. Hart remarked, that when this form of camera was sold, it was supplied with tapes for passing round the plates to prevent friction ; if carriers were employed, the camera would De found inconveniently heavy. Mr. J. J. BRIGINSHaW passed round some very fine trans parencies made on Mr. Cowan’s gelatino-chloride plates, being his first attempts at photo-micrography. The subject was the ventricle of a fly, taken with a J-inch power objective without diaphragm : the focus was 25 inches, and the exposure of negative on a bromide plate, using a paraffin oil lamp and condenser, was 85 seconds. Mr. C. Darker showed some very fine lantern slides of micro scopic objects produced by collodion. In response to the Chairman for details, he stated that the photographed object is enlarged on
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