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The photographic news
- Bandzählung
- 35.1891
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- 1891
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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. 1702, April 17, 1891
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The photographic news
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312 THE PHOTOGRAPHIC NEWS. [April 17, 1891. Tailfer and his colleagues, had been the factor necessary to secure success. By means of a prism, the lecturer projected on the screen a spectrum of the oxy-hydrogen light, showing the colours in great brilliancy. He pointed out that the ray which is lightest in tone to the eye was yellow, the others following in the order of light—blue, green, orange, red, and deep blue and violet. The rays, when photographed upon an ordinary plate, were more or less reversed, the blues and violets showing brightest. He then interposed coloured screens of various tints, showing how they cut off various rays. A series of monochromatic bands were then thrown on the screen, showing the spectrum photographed on ordinary and colour-sensitive plates with and without coloured screens. The series showed clearly that a very pale yellow screen, necessitating about a triple exposure, gave results in monochrome most nearly approaching the effects of colour as seen by the eye. Copies of paintings, portraits, and views, taken in duplicate on ordinary and isochromatic plates, were then thrown on the screen. The lecturer said that the differ ence in the cases of the portraits and the copies of oil paintings were so marked that he found it necessary to state that no retouching had been done. The views taken on ordinary plates were so good that it seemed nothing better could be wished for, yet, when the duplicate taken on the isochromatic plate was shown, the improvement was strongly visible. Reports on plates and paper submitted for test were then given, and further samples of other dealers were distributed to be similarly dealt with. Sheffield Photographic Society. April 7th.—At the Masonic Hall, Surrey Street, Mr. B. J. Taylor in the chair. It was arranged to have Saturday afternoon excursions, commencing May 9th to Oughtybridge; also that the first monthly excursion should be to York early in June, date to be arranged. Mr. Alleyne Reynolds then gave his lecture, “ A Tour Round Iceland,” which was illustrated by a large number of slides, the negatives and slides being made and taken by the lecturer after having made four trips round that island. Oxford Photographic Society. April 7th. —The president, Mr. E. A. Ryman-Hall, in the chair. Mr. A. F. Kerry, M.A., Exeter College, gave an instructive lecture on “Bromide and Kallitype Paper Printing.” Many chemical experiments were made, showing the changes which take place in developing, &c. Some bromide prints were made, and the subsequent manipulations were carried out. The lec turer then spoke briefly on the Kallitype process. The deve lopment of some prints brought the lecture to an end. Mr. Claude Rippon (Merton College) and Mr. H. H. Isons were elected members. Leicester and Leicestershire Photographic Society. April 8th.—After transaction of routine business, Mr. Porritt read his paper entitled, “ Photography, Past and Present,” with notes on the quality of dry plates and lantern slides, and a few remarks on the object of our excursions. During the course of his remarks, Mr. Porritt reviewed the practice of photography from the earliest date of collotype and wet plate processes, describing en route the modus operandi of each process, which was quite novel to the greater part of the members ; from thence he described the gradual transition through the various wet processes up to the almost perfect condition attained by the present dry plate. Lantern plates were then treated, the lecturer betraying a considerable leaning towards the collodion made slide, some excellent specimens of which were passed round. Some good advice to the members with respect to the management of the forthcoming excursions was then offered. The President (Mr. Pierpoint), in proposing a vote of thanks to Mr. Porritt, traversed at some length some of the points advanced by him with reference to the use of rapid versus slow plates for landscape, Answers to Corresponents. All Communications, except advertisements, intended for publication, should be addressed to the Editor of the Photographic NEWs, 5, Furnival Street, London, E.C. All Advertisements and communications relating to money matters, or to the sale of the paper, should be addressed to the Publishers of the Photographic News, Messrs. Piper & Carter, 5, Furnival Street, London. Questions requiring a reply in this column should be addressed to Mr. John Spiller, F.C.S., 2, St. Mary’s Hoad, Canonbury, N. H. B. (Reading).—Direst-Printing Platinotype Paper, You would do well to consult the practical guide issued a few years ago by the Photographic Society, entitled "Platinotype by Captain Pizzighelli and Baron Hubl," edited by Captain Abney, price two shillings (Harrison and Sons, 59, Pall Mall). Also, look for the report of Tuesday’s proceedings, when Mr. Willis described the cold bath process and other modi fications of the platinotype. S. W. (Nottingham).—Blinds in the Studio. A very good arrangement is to have a set of dark green holland blinds, running on spring rollers fixed at the highest point in the roof, supplemented by blue gauze curtains working horizon tally. Besides these, it is well to have the usual paper screen near the sitter, to diffuse the light and soften the shadows ; and to place the camera beneath a hood, so as to shield off the top-light from the lens. Optician.—Toning Collodion Transparencies. You should find no difficulty by using an excessively dilute solution of chloride of gold. Some prefer platinum, or the mercury and ammonia treatment, for a pure black. Will not the gelatino-chloride lantern plates suit you better, for then, as Mr. Cowan has shown, by merely altering the developer an infinite variety of tints can be obtained ? G. E. M.—Gdatino-Bromide Emulsion. The hand-coating of plates is practically abandoned, so that we can hardly pro mise you a good sale for the emulsion, however excellent the quality. The sensitive paper business is rather more hope ful, but several good sorts have already established them selves in public favour. M. P.—Photography in Colours. A coloured electric spec trum of M. Lippmann was shown at the Parent Society’s meeting on Tuesday, but only pink and green were apparent in the little specimen plate exhibited. Inquirer.—The Canadian Co operative Scheme. We have seen the promising advertisement in our contemporary, which seems to be put forward in good faith, although it partakes somewhat of the character of the personally con ducted scheme shadowed forth in Mr. William Black’s “ Donald Ross of Heimra.” £50 is said to defray the cost of transport, equipment, and all preliminary expenses, and the emigrant photographer has three courses open to him at the end of his first season, one of which is to return to England without losing any of his capital or accumulated profits. Write for the full particulars promised by the middle of the month, and judge accordingly. A. M.—Five Years’ Old Dry Plate. Our friend has shown us the transparency, and kindly given further explanations. He exposed for a portrait in 1886 ; then the plate (X L Edwards’) was laid by, forgotten and undeveloped, until a fortnight ago he exposed again for a photo-microscopic object, and proceeded to develop with hydroquinone, when, to his surprise, a good portrait transparency of the original subject came out, showing no trace or outline of the microscopic object, although the subsequent exposure may have had the effect of converting a latent negative into the reversed image which he obtained on development. Received, the Weekly Scotsman and Kent Coast Times of last week, each of which devotes a full column to the report of photographic matters, the former treating of amateurs’ require ments under the head of “ Photography as a Hobby,” besides reporting lectures delivered in Edinburgh by Mr. F. Dundas Todd and Prof. Hunter. The latter news-sheet describes a famous professional studio on the south coast, in contrast with the operations of the camera fraternity on Ramsgate sands.
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