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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
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- Englisch
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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. 1314, November 9, 1883
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Zeitschrift
The photographic news
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Band
Band 27.1883
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- Titelblatt Titelblatt I
- Register Index III
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Band
Band 27.1883
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- Titel
- The photographic news
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Mr. B. J. Edwards showed a pocket telescopic camera stand, made of bamboo, and weighing only 1 pound, 4 feet 9 inches in height, and sufficiently rigid to hold a weight of 120 lbs. Mr. II. Trueman Wood showed some lantern transparencies toned with nitrate of uranium, and an adapter for fitting extra dark slides to the camera. Messrs. Shew & Co. exhibited their “Model” camera, the principal features of which were some improvements in the double swing ; also a rigid bellows extending-body front which could be fixed to any camera, a dark slide, and a camera stand. After votes of thanks to the several exhibitors, the meeting terminated. London and Provincial PHOTOGRAPHIC Association. At a meeting of this Society, held on Thursday, the Istinst., Mr. 1 J. J. Smith occupied the chair. Mr. A. J. Brown, referring to paper dark slides, desired to know if any present had made such a slide ; and, if so, would ' they relate their experience as to its durability. Mr. E. J. Golding made a dozen slides about a year ago, which 1 had been in constant use since then, and were perfect in every way. A discussion arose on the easiest way to clean off old gelatine negatives, and the most suitable method to render them fit for re-coating. For the removal of gelatine films Mr. Haddon gave preference to a bath of dilute chromic acid, followed by copious washing. Mr. Ashman agreed that either gelatine or collodion would yield to this treatment. Many years ago it was a common practice 1 to steep plates in a mixture of bichromate of potash and dilute sulphuric acid before polishing for the wet process. Owing to the poisonous nature of this mixture when in contact with cuts, its use was discontinued; persons susceptable to its influence having any abrasions or cuts on their hands would get them badly ulcerated. If old negatives were put into a hot solution of common potash, the films would readily leave the glass plate ; rinsing the plate in water, passing it through dilute nitric acid 1 to 20, and again rinsing, would leave the plate in excellent condition for polishing. Mr. Brown had tried using a strong alkali followed by nitric acid 1 to 8; he found it very destructive to the tissues of the hands. Mr. W. E. DEBENTAAr preferred hydrochloric acid to nitric acid ; the skin would not be affected by it. Mr. Golding used sulphuric acid 1 to 12, and found it answered admirably. Mr. J- J- Adams desired to know which form of instantaneous shutter was considered the best. Mr. Debenham : For what purpose—seascape or landscape work ? A drop-shutter accelerated by a spring to expose in Pth of a second would be a useful shutter. Mr. Brown : Shutters fitted with an adjustment for regulat ing speed were seldom reliable; a shutter of French origin, shown at the exhibition last year, was found, when timed against a watch, not to differ, whether set at Yoth or th of a second. Mr. Golding showed an example of reducing by perchloride of iron as suggested by a member a fortnight previously. Gelatino-chloride transparencies of red colour were treated ; after four minutes’ immersion in the solution, the colour changed from red to a bluish-purple, and the image was considerably re duced ; the plate had not been fixed afterwards. Mr. Debenham thought if perchloride of iron dissolved any of the silver image, the blackening action upon exposure to light could be accounted for. Mr. Golding had not noticed any change of colour since the experiment was performed. Mr. A. L. Henderson brought some plates coated with Mr. Haddon’s green fog mixture, to clear in the presence of the meeting, by means of cyanide of potassium. A plate moistened, and placed, film downward, over the cyanide solution, became clear in four minutes. Mr. Brown considered the experiment was no proof of re ducing density in a negative ; he should repeat the experiments on a dense negative. Mr. Henderson, referring to the subject of pinholes brought orward on the 18th ultimo, showed a plate of the same emul- sion divided into two parts ; one part was exposed in the camera e usual time, the other part was exposed to daylight. The camera plate was riddled with clear spots, and the other with opaque spots; ho believed the addition of barium nitrate to the emulsion would prevent their formation, and considered sulphate of silver the cause. Mr. BEown thought the reason why the spots were clear in one plate and opaque in the other might be due to a reversed action of light. Mr. Henderson denied that such was the case ; he believed the so-called reversed action of light theory to be a fallacy. Mr. S. Bapty was elected a member of the Association. Mr. W. E. Debenham was announced to occupy the chair on the next occasion. Dundee and East of Scotland PHOTOGRAPHIC Association. The second regular meeting for the winter session was held in Lamb’s Hotel, on Thursday, 1st November; there was a very large attendance. The revised edition of the rules was passed with a few slight alterations. Mr. D. Ireland, Jun., was elected Honorary Secretary in place of Mr. Chas. Johnson, who resigned the office some time ago. There were several prints sent in for the competitition on “ Sky,” and it was agreed to let the council adjudicate on these. Six new members were proposed for admission. Mr. Goodall (of Goodall and Steven, Glasgow), assisted by Mr. McGhie, then proceeded to give a practical demonstration of his method of enlarging an argentic paper and opal (see page 711). Mr. McGhie showed some novelties in photographic apparatus ; amongst others, Cowan’s box for packing dry plates, Pumphrey’s filmograph, and a novel instantaneous shutter. He also handed round some specimens of a new photo-engraving process by Annan, of Glasgow. A vote of thanks to Messrs. Goodall and McGhie brought a very interesting meeting to a close. Walk in the Studis. Photographic Society of Great Britain.—The first ordinary meeting of this Society for the ensuing session will take place on Tuesday next, November 13th, at eight p.m., in the Exhibition Gallery, 5a, Pall Mall East, when the medals awarded will be presented. A paper will be read by Mr. Jabez Hughes, entitled, • Thirty Years of Photographic Progress; how it has been Secured and how it may be Maintained ; ” and other business transacted. Lantern Evenings at the Exhibition.—On Monday evening last the Gallery was again crowded to witness these now de servedly popular displays, some hundred and fifty slides being shown, comprising transparencies by Messrs. J. Dixon, Arthur Hill, W. Cobb, Acworth, Pell, Fincham, and W. England. Gelatino-Bromide Paper.—Messrs. Goodall and Steven wish us to correct a statement made in the last report of the Liver pool Society. They manufacture gelatino-bromide paper only, and not collodio-bromide paper. Society of Arts.—Arrangements have been made for the following papers and lectures during the coming session:— December 12 th.—Thomas Fletcher,' F.C.S., “Coal Gas as a Labour-saving Agent in Mechanical Trades.” December 19th. W. H. Preece, F.R.S., “The Progress of Electric Lighting.” C. R. Alder Wright, F.R.S., D.Sc., “Cupro-Ammonium Solution and its Use in Waterproofing Paper and Vegetable Tissues.” Dr. Percy F. Frankland, “ The Upper Thames as a Source of Water Supply.” A course of Cantor Lectures will be on “ Recent Improvements in Photo-Mechanical Printing Methods,” by Thomas Bolas, F.C.S. Lecture I.—New Developments of the Woodburytype Process (Monday, January 28th). Lecture II.— Type Blocks from Line Drawings and Half Tone Subjects (Mon day, February 4th.). Lecture III.— Intaglio Plates. Collotypes. Photo-Mechanical Methods, as applied to the Decoration of Pottery. Miscellaneous Processes (Monday, February 11th). Another course will be on “ The Alloys used for Coinage,” by Professor W. Chandler Roberts, F.R.S., Chemist of the Royal Mint. Mr. J. Norman Lockyer, F.R.S., F.R.A.S., will also deliver Cantor Lectures on “ Some New Optical Instruments and Arrangements.” The Times on Shutters and Finders.—We extract from a comprehensive article on photographic apparatus :—“ In leaving the subject of shutters, it may bo remarked that, as. a skilful workman will produce good results with clumsy and inefficient tools, so a clever manipulator may, by a dexterous use of the focussing cloth, almost do away with the need for a shutter at
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