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The photographic news
- Bandzählung
- 29.1885
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- 1885
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- Bandzählung
- No. 1382, February 27, 1885
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The photographic news
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Band 29.1885
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- Register Index III
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142 THE PHOTOGRAPHIC NEWS. LFEBRUARY 27, 1885. perfect negatives upon plates which had remained four months in the slides. Mr. Burton alluded to the darkening action wooden rollers caused to sensitised paper when left in contact only a few hours, and attributed it to a partial reduction of silver by the fumes of turpentine emanating from the wood. Mr. Cowan exhibited and explained his new lantern slide carrier, which, besides possessing the necessary mechanical means of passing the slides through the lantern, was also automatically arranged to raise a curtain during the period of change, a new picture appearing upon the screen on withdrawing the curtain. The following questions were then considered:—“ What is the best colour to stain microscopic sections with, if it is desired to obtain considerable contrast ? ” “ How many changes of water at 120 s F. are necessary to remove all the hyposulphite from an albumen print ? ” “ Can anyone give a good formula for rapid printing other than Mr. Wellington’s, published in the News ? ” “ What is the longest period ferrous oxalate developer can be kept, and still give satisfactory results ? ” Mr. A. J. Brown said that in staining microscopic sections, they would be found selective, some for one colour, and some for another. For photographic purposes it was better, in many cases, not to stain the sections. Mr. F. W. Hart advocated the employment of an eliminator, and objected to the use of hot water for the removal of hypo sulphite; he never exceeded a temperature of 70° F. in winter. Mr. Burton placed his prints into water nearly boiling, and allowed them to remain until cool. Mr. Barker found that an addition of Rochelle salt to a bromo-chloride emulsion on paper enabled him either to print out, or develop. Mr. Burton said any of the rapid papers could be printed out if previously floated on a silver bath. He found the new deve loping process was 1,000 times more rapid than the old method of silver printing; his experiments were carried out by means of a paraffine flame, the continued heat of which for five hours had destroyed much of the brilliancy of the print. The Chairman thought fumed paper would have given a different result. Hethen spoke of the term “so many times rapid ” as misleading, and recommended standard sensitometric measurements. Mr. Archer Clarke used ferrous oxalate developer continu ously, adding a little fresh developer to start the action when required ; he promised further information at a future meeting. Messrs. A. G. Gravatt, T. S. Sillar, and W. H. Hyslop were elected members of the Association. It was announced that on March 5th Messrs. Morgan and Kidd would give a demonstration on “Paper Negatives, and the Development of Gelatino,-chloride Prints.” Liverpool Amateur Photographic Association. An extra meeting of this Society was held on Thursday, the 19 th inst., in the Lecture Room, Free Library ,Willbrown Street, for the exhibition of lantern slides produced by the members during the year. The proceedings were commenced by the exhibition of about fifty slides of views taken by Mr. J. H. T. Ellerbeck during a tour in Norway. This series of slides excited much enthusiasm amongst the numerous visitors, and one after another the wonderful fiords, mountains, and waterfalls were shown on the screen. The slides were on wet collodion and gelatino-chloride plates. Mr. Ellerbeck expressed the difficulties he had ex perienced in getting satisfactory results on gelatino-bromide plates with soda development, but showed one developed with ferrous oxalate that left nothing to be desired. Mr. J. H. Day showed a series of home views on gelatino- bromide plates, developed with the ferrous oxalate and soda and pyro. The Hon. Secretary followed with eight slides developed with pyro and soda. Mr. War. Rogers showed an interesting series, showing the tones obtainable on gelatine and albuman plates. The ex posures at two feet from the gas light varied from five seconds to five minutes ; the development was by ferrous oxalate, the result in the last instance being a rich brown, with perfectly clear high lights. Mr. Blanchard exhibited slides on bromide plates developed with soda and ferrous-oxalate, both being equally good. Mr. Cornish showed about twenty-four slides all on chloride plates, and Mr. A. W. Beer seventeen or eighteen on chloride plates, and also on gelatino-bromide plates. Amongst these exhibits there were many of exceptional beauty which elicited warm admiration. Mr. Gardner showed eight slides on gelatino-chloride plates which were greatly admired, both subjects and treatment being very perfect. These were followed by a series of Swiss views taken by Mr. Boothroyd, which were also greatly admired, and the meeting broke up, everyone seeming to have thoroughly enjoyed the wide range of travel, from Norway to Switzerland abroad, from Oxford to Leamington to the Isle of Man and North Wales at home. Many picturesque bits in the vicinity of Liverpool were also shown, and the slides, which were on nearly all the plates in the market, as well as on wet collodion, proved that in good hands all were capable of yielding every gradation of light and shade. Soda and p3 ro came well to the front, and before the meeting closed a lady visitor had entered into the spirit of the proceeding so thoroughly that she was heard to exclaim, triumphantly, “ I knew that was soda,’’ as one especially beautiful slide was shown. Cheltenham Photographic Society. The monthly meeting was held on Feb. 12th, Col. Dawson, C.B., in the chair. Mr. Genham read some remarks on the washing soda deve loper ; his formula for which has already been published. In the course of discussion, Col. Dawson stated that he preferred potash, using six grains to each ounce of developer, with a little bromide in the summer. Capt. AYLENER Jones, R.E., exhibited prints of a torpedo explosion, showing the different stages of the effect, taken with the phantom shutter electrically controlled, and opened at intervals of one-fifth of a second. The chromo-photoscope was shown by Mr. Penny. North Staffordshire Amateur Photographic Association. Tne usual fortnightly meeting was held on Wednesday, Feb. 18th, the chair being occupied by Mr. F. J. Emery, Vice-President. In the unavoidable absence of Mr. G. S. Burgess, who had undertaken to give a practical demonstration of the working of the new rapid printing process, The Hon. Secretary (Mr. Allison) demonstrated the method of developing carbon prints, by producing several successful pic tures upon opal. Following Mr. Allison in his explanation of the carbon process, The Chairman gave an interesting description of the Wood- burytype and other photo-mechanical printing processes, photo engraving, &c., undertaking to exhibit specimen blocks, prints, &c., at the next meeting. Votes of thanks to the Chairman and Hon. Secretary having been passed, the meeting terminated. Bradford Amateur Photographic Society. The ordinary monthly meeting was held on Thursday last, at the Law Institute. The minutes of the previous meeting having been read and approved, the President announced that £10 had been promised towards a prize competition amongst the members for the best pictures taken during the year in the following classes): landscape, architectural, instantaneous, composition sub ject, and lantern slide. Mr. Duncan G. Law (the President) afterwards read a very interesting paper on “Photographing in Savoy,” illustrated with over a hundred 7} by 5 prints of the scenery of the Savoy, at various altitudes, with lenses varying from 4 inches to 22 inches focus ; he also showed a French pneumatic shutter by Guerry that had answered well in reproducing cloud effects. After a cordial vote of thanks the proceedings terminated. Hyde Amateur Photographic Society. This Society held its meeting on Wednesday evening, the 18th inst., a goodly number being present. The President (Mr. F. W. Cheetham) gave a demonstration on “ Toning and Fixing of Prints.” The subject was handled in a masterly manner, the lecturer having prints in the various stages ready for manipulating, as the various processes were gone through. A lively discussion took place as to the great , variety of colouring to be obtained.
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