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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. 1404, July 31, 1885
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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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Band
Band 29.1885
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THE PHOTOGRAPHIC NEWS. LJULY 31, 1885. coated had not been washed free of all soluble salts. That during the first very slow drying, at the edge the salts had diffusedin towards the centre, till, as the drying began to become more rapid, it had, so to speak, overtaken the salts, leaving an outer edging of emulsion perfectly free from soluble salts, a strip next it surcharged with them, whilst the rest of the plate contained a medium amount. On this assumption it would be expected that the washing and drying of the plate before exposure would result in a complete rectification of the defect. Mr. Henderson had tried the experiment of washing one or more plates of the batch, which showed the defect with, if we understand him rightly, the following result. The sensitiveness of the centre of the plate was increased nearly to that of the outer edges ; the insensitive strip was made much more sensitive than it had been, but still remained somewhat less sensitive than the rest of the plate. Several members corroborated the deduction that would naturally be drawn from the last fact, namely, that no amount of washing will thoroughly destroy the effect of soluble bro mide allowed to remain in a gelatino -bromide film whilst the latter is dried. This is an interesting fact, and one which it is useful to know. The discussion as to the relative keeping qualities of gelatino-bromide and gelatino-chloride plates was brought up by the exhibition of a transparency on a gelatino- chloride plate, in which there was a portion without image all round the plate, the effect being, in fact, that of a vig netted picture, except that the shading followed the shape of the plate instead of leaving an oval image. The plate shown was only one of a number which had been exposed and developed, and we have had an oppor tunity of seeing these, and of gaining all particulars about them. In the beginning of March of this year a dozen quarter plates and a dozen 12 by 10 plates were purchased from a firm which deals largely in a well-known brand of platino- chloride plates. One of two transparencies was made at the time that the plates were purchased, the results being all that could be desired. About a week ago the remainder of both the large and the small plates was used up. In the case of the small size, only the two plates which had been uppermost in theboxshowed any serious defect. They were spotty, and had a narrow insensitive edging. In the case of the large plates, the defects were much more marked. The upper plates of the box were exceedingly spotty, had a very wide insensitive margin, and, moreover, had large comparatively insensitive patches all over them. Besides this, there spread over the whole of the film, during deve lopment, that peculiar metallic lustre which most must be familiar with in the case of gelatino-bromide plates which have been kept for a very long time in an impure atmo sphere. The defects became less and less marked as plates nearer the bottom of the box were used, the lowest two or three showing nothing objectionable, except the clear rims of insensitive film. The plates had been kept in a chest of drawers in a well ventilated room beside gelatino-bromide plates which had been there long before the chloride plates were purchased, yet showed no deterioration. Large plates, such as 12 by 10, are of course in much less demand than quarter plates, and it is fair to assume that the particular 12 by 10 plates referred to had been kept for a comparatively long time in the warehouse before they were sold. The quarter plates had, however, just commenced to show the effect of time, and it may probably be said that the time during which they had been kept- say (allowing for a short time in the warehouse), about five months—is thelimitof time during which an opened packet of gelatino-chloride plates„can be kept in London. The defects mentioned, beginning from the edges, were evidently due to the action of the atmosphere. It may therefore be assumed that plates very securely wrapped up would keep for a much longer time than five months with out deteriorating. We ought to say that in the particular case to which we refer, the boxes had not even been wrapped up in brown paper after they had been opened, but had simply been placed without covering in a drawer of the chest of drawers. The general impression of the meeting already r eferred to was, that gelatino-chloride plates were more likely to deteriorate through keeping than gelatino-bromide plates, the proportionate amount of gelatine being in each cise the same. It was pointed out, however, that increase in the amount of gelatine is an easy means of improving the keeping qualities of plates coated with gelatino-chloride emulsion. CYCLING AS AN AID TO PHOTOGRAPHY. BY HENRY STURMIEY, (Editor of The ’Cyclist.) The season for out-door work with the camera having now fairly set in, it may not be out of place to say a few words, giving suggestions as to the various ways in which the bicycle and the tricycle may be rendered ready slaves to the photographer’s will, and do him good service in transporting him and his belongings from one spot of beauty to another, with the minimum both of expense, trouble, and time. It matters not whether the photo grapher be amateur or professional, the willing wheel will be equally at the service of either ; and although I doubt not the amateur will be the one to most frequently avail himself of its powers, the hints I am able to append hereto will, I trow, be of equal service to the professional who essays a journey on wheels. The bicycle as a photographer’s friend doesnot strike one at first sight as being a very ready one, but by a little in genuity a clever rider can get along very well with one, though the size of his views is necessarily more limited than if he adopted the three-wheeler as his vehicle. A full kit for taking quarter-plate pictures can be most com fortably carried without much ingenuity or cleverness on the part of the rider ; but a half-plate or 5 by 4 camera, and its necessary slides, &c., is rather more difficult The first difficulty that strikes the cyclist is that of carrying the very needful tripod ; and here the several inventions in telescopic and multifold stands, of which I shall speak anon, will be found to come to his aid most opportunely- If he have neither of these, the only way to carry the stand successfully is to strap it lengthways along the handle-bar. The camera and other paraphernalia had better be distributed over the machine, and he will find that by carrying the camera in its case—by one of the many devices known to bicyclists—attached to the front of the head of the machine, and fastening the receptacle contain ing the dark slides, lens, &c., to the back of the saddle, he will get a satisfactory distribution of weight. The ordinary large-sized multum-in-parvo bag will be found a very useful article for this purpose, and will hold half-a- dozen double dark slides for cameras up to half-plate, as well as focussing cloth, spare lenses, shutter, &c., &c., very well, whilst the entire apparatus, camera included, can easily be contained in it if the cyclist is modest, and restricts his views to quarter-plate size. Of course the choice of vehicle with the cycling photo grapher will in a great measure depend upon circum stances ; he may have a machine already, or may borrow the use of one belonging to a friend, and will be desirous of utilizing the means at his disposal in the best way possible ; whilst on the other hand, I may be addressing those who, being photographers, are desirous of purcba- ing the most suitable machine for the especial purpose of utilising it in connection with their camera. With these varying circumstances of readers before me, I will endeavour, as far as possible in these lines, to frame my remarks so that they shall be of use to all parties, and therefore, before treating upon machines especially
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