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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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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1313, November 2, 1883
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Zeitschrift
The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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November 2, 1883.| THE PHOTOGRAPHIC NEWS. 701 me, I felt much disappointed, for many details which would have been of the greatest interest (to an amateur, at nyrate) were omitted. Perhaps Mr. West would be so kind as to tell us them. Such as—“ How did he place his camera; did it stand on its tripod simply, or was it arranged on boxes or other supports?” “What plates were used?” And, above all, “What instantaneous shutter ? ” If it is not asking him to “ show his hand too much,” 1, for one, would be grateful for the information.—Yours sincerely, An Amateur. THE NEWCASTLE EXHIBITION. Dear Sib,—Kindly allow me, thiough the News, to remind intending contributors to our Exhibition that notices of exhibits should be sent in by the 12th November. Pictures will be received at the Central Exchange Art Gallery up to 9 p.m. on the 20ch November. The Exhibition will be opened on the 23rd inst., and will be closed on the 8th Dec. I shall be glad to supply further particulars, forms, &c., to anyone desiring them.—Yours very truly, J. Pike, lion. Sec. Aroceedings nt Societies. London and Provincial Photographic Association. At a meeting of this Society held on Thursday, the 25th inst., Mr. W. Ackland occupied the chair. Mr. A. J. Brown enquired if any of the members had succeeded in reducing dense negatives by Mr. Henderson’s method ? He could not succeed either with hydrocyanic acid, or cyanide of potassium, and desired information. Mr. Debenham said a gentleman mentioned at the last meeting that he had failed. Mr. A. L. Henderson could not account for failure ; if any one would bring him some negatives, he would reduce them. Mr. Barker showed samples of Coignet’s gold label and special photographic gelatines, said to be free from spots or pitting ; he wished some members would try the samples, and report their results. Mr. Debenham defined the true Coignet spot as distinguished from others. Mr. T. Bolas had not met with a sample of Coignet’s gelatine free from spots ; the most severe test would be coating a clean glass plate with plain gelatine solution ; pits, if present, could be discerned as the gelatine set: the addition of salts, as in emulsion making, would rather tend to prevent their formation. Mr. Henderson differed in this respect; he could cure the gelatine by the addition of bicarbonate of potash solution, exhausting the air, re-charging the vacuum, and exhausting a few times. Mr. Bolas said exhausting dissolved air from an aqueous solu tion of gelatine or other colloid body was often practised by collotypers ; possibly Mr. Henderson might remember an appa ratus he (Mr. Bolas) used in one of his lectures at the Society of Arts, m connection with this subject. There would be less tendency to spots of the kind mentioned by Mr. Debenham, but the physical character of the gelatine would be changed. In point of hardness, Coignet’s might be considered at the top of the gamut, and common glue at the bottom. Watching the forma tion of pits, they would be noticed to rise to a pyramid, then fall in, leaving a hollow, with a wall of gelatine, as setting takes p'ase. Mr. Brown enquired the best means of reducing gelatine to a powder. Mr. Bolas said gelatine could be ground similar to other sub- s'aaces, if a suitable mill be employed. Bailey’s would be found useful in the laboratory, being geared to produce a difference in speed between the muller and the pan. MrF. W. Hart attributed pits to a fungus, and would like to know if carbolic acid had been used as a remedy. He had ex perimented in this dir ection, and was of the opinion that a uizable antiseptic would entirely prevent the evil. Mr. Barker had a bottle of emulsion which has been corked up for five years, and was still perfect; the nitrate of potash salt not being washed out, had preserved it. He found the addition of a small quantity of alcohol or water assisted in reducing gum- arabic and similar substances to a powder. Dr. Steval, a gentleman whose name is well known among the students of Continental photography, gave a brief descrip tion of the state of dry plate photography in Germany. He attributed some of the difficulties of emulsion work to the care lessness in the manufacture of the chemicals used. In one case, 40 per cent, of nitrate existed in a sample of ammonium bro mide. Cold emulsification, according to the formulae published by Mr. Henderson, is worked almost exclusively in Germany. The silver medal awarded at the late exhibition, for plates of German manufacture, were produced by the cold method. With regard to speed, German photographers were anxious for greater speed ; but many of them could scarcely work such extremely rapid plates as was customary there. Anything quicker than fifteen times collodion would be considered in Germany very rapid. Mr. Barker showed a plate exposed one minute to day-light to obtain a reversed action of light; upon developing, the covered portion was reversed also. Mr. Cowan demonstrated the easy manner in which gelatino- chloride transparencies may be produced for the lantern or en largement. The emulsion was the slowest he could make ; exposed through a negative one foot from a gas jet for ten minutes would not suffice to obtain an image, whereas one inch of mag nesium wire, burnt at a distance of eighteen inches, would be sufficient. After such an exposure, the plate was put into a mixture comprising the residues of all the developers used in Mr. Cowan’s recent experiments—that is, all the citrates, with ferrous oxalate. The image developed in five minutes, and fixed in one minute, the length of time for developing depending on the proportion of ferrous oxalate present. Mr. Debenham said at the last meeting Mr. Cowan showed variety of tone by varying the citrates ; Dr. Eder showed the alteration of exposure and using the same developer obtained changed results. That afternoon he exposed one plate sixty seconds, and another thirty seconds, developing in a mixture composed of citrate of magnesia two parts to one part of ferrous oxalate ; and ferrous oxalate two parts, with magnesia citrate one part, respectively. The plate receiving sixty seconds was a warmer tone, and developed quickly; the thirty second plate developed slowly, and was colder in tone. He (Mr. Debenham) considered that variety of tone could be obtained by varying either expo sure or development. . Mr. Brown agreed with Mr. Debenham ; some experiments of his nearly two years ago tended to prove it. A photograph of the St. Leger race was shown by Mr. Crosby The horses were represented going at their highest speed, and absolutely sharp, the features of the jockeys being recognizable in two or three instances. Messrs. H. S. Starnes and E. Twiss were elected members of the Association. Mr. J. Traill Taylor was announced to deliver a lecturette on Thursday, Nov. 8th; the subject will be “ Lens Grinding.” Glasgow Photographic Association. The second general meeting of the Institution was held in the Religious Association Rooms, on Tuesday, the 23rd of October, Councillor Robertson in the chair. The minutes of the last meeting were read and approved of. The Secretary also read letters from Messrs. Parkin and Dickie, acknowledging receipt of their awards, and thanking the donors for the same. Councillor Robertson then proposed that a small committee be appointed to select a photograph to be engraved for the pre sentation print; he named three gentlemen, Messrs. John Parker, Andrew McLear, and Thomas Annan, who were accordingly ap pointed. The question-box was then opened, and the following questions were found :— 1 st. “ Has the winner of the medal for the transparency com petition complied with the rules by sending in a written descrip tion of the method by which they were prepared for the use of the members of the Society, and if so, why has it not been dis tributed among them ? ” Mr. Parker said that he was not aware that that was one of the rules, but that he would be very glad to give a description of s process. 2nd. ” Has any member tried the collodio-chloride printing
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