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The photographic news
- Bandzählung
- 29.1885
- Erscheinungsdatum
- 1885
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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. 1389, April 17, 1885
- Digitalisat
- SLUB Dresden
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Zeitschrift
The photographic news
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Band 29.1885
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- Register Index III
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section of the Exchange. In like manner Mr. Beach will ship the slides he gets in, corresponding in number with those 1 send to him, and upon arrival they will be divided into batches, and distributed in turn to each English mem ber of the Exchange, who will keep them a certain time, and take copies if he feel so disposed. This is the general idea, and I shall be glad to have the names of British photographers who will undertake to carry out the arrangement sketched out. We shall thus get modern views, and many of them at a very small out lay.—Yours truly, H. Smith. Proceedings of Sorteties. London and Provincial Photooraphic Association. A MEETING of this Society was held on Thursday, the 9th inst., Mr. A. Cowan in the chair. A series of chloride transparencies from negatives made by the Chairman at the outdoor meeting of the Photographic Club, On Bank Holiday, was shown to illustrate the absolute safety of his new combined camera and changing-box when in the field. The Chairman also exhibited Mr. Matthew Whiting’s new lantern slide carrier. The chief characteristic was the attach ment of two portable chambers, one on either side of the opening, capable of containing a number of slides retained in position by means of a spiral spring. Each time the shutter was actuated one slide was released from the feeder, and so travelled along the platform, and through the lantern. By means of a spring the slide was then thrown out of the square sufficiently to be underlapped by the succeeding slide, and from thence into the chamber provided for its receptacle. The Chairman illustrated the practical utility of the arrangement by rapidly passing about thirty slides from one chamber to the other. The following question was then read:—“ Why does the pre cipitate formed upon the addition of iodic acid to nitrate of silver dissolve in ammonia ? ” A discussion ensued, but no direct evidence was brought forward bearing upon the question. The general opinion was, however, that as the majority of the silver salts are soluble in ammonia, it might fairly be expected that silver iodate was among them. Mr. H. S. Starnes then spoke of certain plates giving green fog when developed with ammonia or carbonate of potash con taining restraining bromide, but not so when the bromide was omitted from the latter ; he used 3 drops of a 250-grain solution of the latter alkali, with 2 grains of pyro, and the exposure was only half that required with the ammonia developer. The Chairman said that Mr. Newton did not advise the use of a restrainer, and his proportion of alkali was much greater— about 12} grains of each carbonate per ounce of developer. Several members said they were enabled to reduce their ex posures materially by employing the carbonate of soda or potash developers. Mr. C. HEINRICK Thinks stated that he had received a com munication from a friend on the Continent, who desired to know how far the splitting up of combination or doublet lenses might be carried to advantage, and which were the most suitable for the purpose. The Chairman remarked that any of the rectilinear forms might be so treated. Mr. Thinks then asked Mr. Debenham what the effect would be if the stop were not placed in the optical centre. From recent observations he believed he obtained better results in some cases by varying the distance of the stop. Mr. Debenham did not consider it right to assume that because the position of the stop had been varied in the cases alluded to, it was not in the centre. There was only one correct place in a properly constructed lens. Mr. Thinks noticed that when using a single lens it was necessary to put the stop nearer than when using one of the doublet form. Mr. J. Barker ■ When only part of a doublet is used the focus is too long, and therefore the lens is slower in action. Mr. A. Mackie's experience was, that the rectilinear form would not work with so large an aperture as the single. In the best lenses the place for the stop was found by practice, and not mathematical calculation. Mr. A. L. Henderson : Are we to understand that the in sertion of a stop lengthens the focus ? Mr. Debenham replied that in a properly-constructed lens the central rays would not be altered in any way. He then illustrated, by means of the black-board, the effect likely to be produced both by varying the position of the stop, and covering up the margin of the lens. Glossop Dale PHOTOGRAPC Society. The members of the above Society had their first “ turn out ” for the season 1885 on Good Friday, and the muster was the largest out-door meeting since the Society was established. The “meet” was at the Society’s rooms at 10 o’clock. The morning was very fine, with nice diffused sunlight, though the distance was somewhat obscured by mist, which, however, soon disappeared, and for a short time the prospect seemed all that could be desired. Unfortunately, this state of things was of brief duration, for about 11.30 an exceedingly dense fog was seen to be approaching, and very shortly the whole neighbourhood was encircled with gloom, entirely frus trating any attempts at photography. After a while, however, the fog gradually disappeared, and advantage was taken to secure a few groups, &c. The remainder of the day was bright, with a slight mist, and some good work was accomplished, most of the plates exposed subsequently turning out very fair negatives. The ordinary monthly meeting was held at the Society’s Room on Tuesday, the 7th inst., the chair being occupied by Mr. J. Merry. The minutes of the last meeting were read and con firmed, and the Secretary then reported communications from the London Stereoscopic Company, Messrs. Fry, and the Wood bury Fund Committee. Mr. Hardman exhitited a patent camera. It was incidentally mentioned that one of the members had received two letters from a firm of solicitors, threatening him with proceedings for indecent behaviour in a churchyard, the alleged offence being that he had “ carried a photographic appa ratus into consecrated ground,” and, horrible to relate, had actually taken a photograph of the exterior of the church ! The announcement was received with roars of laughter. It must be understood that the gentleman in question was not acting (con temptuously or otherwise) in opposition to the expressed wishes of anyone in authority. On the contrary, ho had the full per mission of the vicar’s churchwarden, who was then and there present. Hyde Amateur PHOTOGRAPIIIC Society. This Society had its first ramble of the season on Good Friday, the route being through Bottoms Hall Wood and on to Mellor, through the Willows (Marple), and on to Compstall, where they had tea in the Gardens. On Monday, the Gth inst., a few of the members availed them selves of a trip to Liverpool, and several really good pictures were taken of docks, shipping, and other views. On the 1st inst. the Society held its meeting in the Mechanics Institution, there being a crowded room, Mr. F. W. Cheetham, President, in the chair. After confirming the minutes of the previous meeting, and nominating several new members, the Chairman called upon Mr. John Pollitt to read a paper on “ The Influence of Photography on Popular Taste and the Graphic Arts.” Mr. Cheetham here vacated the chair, and Mr. John H. Brooks was voted to preside. Whilst Mr. Cheetham and Dr. Sidebotham got ready for the lantern entertainment, the secre tary, Mr. John Crowther, exhibited several prints from America, received frcm Mr. J. E. Danmont, of Rochester, N.Y., amongst them being “Niagara Falls iu Winter,” “Harper’s Ferry,” showing three States, Maryland, Western Va., and Virginia, “ By the Quiet River,” “ A Hudson River Steamer in Rapid Motion,” “ View of Steamboat Landing in Albany,” the two latter views being taken from on board a rapidily moving steamer. Mr. Crowther had mounted these views. Mr. Pollitt exhibited many of the old style of photographs which were
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