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The photographic news
- Bandzählung
- 27.1883
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- 1883
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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. 1282, March 30, 1883
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Zeitschrift
The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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207 the plate makers), I have taken great delight and pleasure from the practice of the art. I do not think that young men with spare time for such healthful enjoyment are generally aware of the facilities of prosecuting the art so obviously placed within their reach. I constructed a drop shutter from a description by one of your correspondents, and it answers admirably—I cannot do without it. It seems to me that the most brilliant pictures generally are to be got by full aperture with the rectilinear, and using, when possible, the drop shutter. I have the idea that for a moment, in capping and uncapping, a side light gaining admission into the camera (just as the cap comes off and goes on) is detrimental, whereas there is decision about the drop shutter. I have been successful with micrographic pictures to an extent which flatters my vanity, and I hope does justice to the manufacturer of the plates. I try hard to get good transparencies, but cannot attain to the beauty of some 1 have seen, and put though the lantern—the whites as clear as crystal, and the lines as sharp as a knife. I suppose 1 must for this blame my negative, my working, and, last of all, the plates. I was partly successful one evening in photographing a young audience, I was addressing, of about one hundred, in the hall in our village. With assistance I got two oxy-magnesium lights to “ work the oracle.” Exposure, I think, will always be one of the most difficult points in the art for beginners, judging, at least, from my own amateuring experiences. The actinic power of the daylight is so variable that what to the artist may seem quite a similar condition of atmosphere to some given data, he finds, at the cost of two or three plates, is not so considered by the sensitive coating. Some are evidently prone to blame the plate, but when tried by artificial light I find very correct exposure can be given. I believe if the amateur would take a note alwaysof the condition of the light, time of year, barometric or rain band spectroscope readings, temperature, and prevalent weather, be would have chance of formulating workable rules for his or others’ guidance.— Yours, much obliged for the indulgence, R. B. Smith. Aroceebings of PHOTOGRAPHIC Society of GREAT Britain. A meeting was held on Tuesday last, Captain Abney occupying the chair. The Cellerier colour pictures,"which wereshown on a former occasion, were again brought under discussion, and Mr. John Spiller, who had dissected some of them, came to the conclusion that the effects were obtained by a double printing process, hand colouring being resorted to between the printings. It seems probable that a very faint photographic image is first impressed on salted paper, after which the colouring is applied. A sensi tive superstratum, perhaps a gelatine emulsion, being now applied, the fully gradated photographic image is printed, a registering printing frame being used to insure coincidence of the two im pressions. Several other gentlemen who had also examined the picture concurred in the view taken by Mr. Spiller, and, in addition to this, Mr. Spiller’s dissections of the pictures spoke for themselves. Mr. Cowan showed a picture, the interior of his studio, taken with a pinhole stop, and an interesting discussion ensued as to the limits of definition attainable ; Captain Abney pointing out that, were it not for diffraction, this limit would correspond approximately with the diameter of the aperture ; but diffraction may so far affect the result as to double the minimum of defini tion. Mr. Cowan’s photograph certainly possessed a certain pictorial quality not generally met with in a photograph, all objects being equally sharp, whether three feet or thirty feet from the camera Mr. Bolton showed some vacuum filters, in which partial exhaustion was effected by the condensation of steam ; such an I arrangement possessing a possible advantage in the absence of an I air-pump. The Chairman handed round his successive exposure electric shutter, as used by him for his photo-grammetrical investigations regarding the altitude of clouds. Some conversation took place as to the effect of the long-continued action of light on .certain varieties of glass, the general impression being that ordinary sheet glass becomes lighter in colour after having been long exposed ; and Mr. Ackland referred to the rapidity with which dense flint glass, such as is used in making the modern deep- curved lenses, is tarnished by sulphurous vapours. The Chairman next read a notice, having reference to the Calcutta International Exhibition of 1883, 1884 ; but the sub stance of the notice was placed before our readers over a month ago. London and Provincial Photographic Association. At the meeting held on the 22nd inst., Mr. A. L. Henderson occupying the chair, the following questions from the box were discussed:—(1). “For equal rapidity of plates, prepared by means of ammonia and boiling, is it possible to obtain equal fineness of division of the bromide or silver ?(2). “Does an unwashed emulsion ripen when set, and to what extent ? ” Mr. A Cowan said, with respect to the first question, he never obtained fineness of division in ammonia nitrate, but always obtained the blue colour. Mr. Golding often found that of two emulsions prepared in precisely the same manner, one would give a dense, the other a thin, picture. Mr. W. Cobb found a slowly-emulsified emulsion gave a finer division than a rapidly-emulsified one. Mr. Haddon said Mr. Burton’s old method of adding ammonia after boiling gave greater granularity; he used no ammonia, but found boiling gave a finer emulsion. Mr. Golding said, as to the other question, it did ripen. The Chairman thought it advantageous to keep it, as it would not granulate ; but did not think it would increase the speed, and would give a thin image. Mr. Bedford said it was advantageous to keep it; it gave 2 or 3 more on the sensitometer when kept. Mr. Debenham, like Mr. Prestwich, thought hard gelatine would not make a slower plate. Mr. G. D. Plomer was elected a member. Dalk in the Studio. South London Photographic Society.—At the meeting of the Society to be held at the House of the Society of Arts, John Street, Adelphi, on Thursday next, Mr. H. Trueman Wood will read a paper “ On the Methods by which the Vocal Organs have been Photographed.’’ The following, from the question-box, will also be discussed : “ When large pictures are required, is it better to take them direct, or to take small negatives, and then enlarge them ? ” The ELPHINSTOX-VINCENT Dynamo.—On Wednesday a demonstration of the capabilities of this apparatus was given at the printing works of Messrs. Unwin ; and as regards the yield of current it was proved to be fully equal to any machine based either on the Pacinotti, or on the Niardet-systems ; while the compactness, accessibility of parts, and general excellence of design, which characterise the new machine, served to elicit very favourable remarks from several eminent engineers who were present. Balloon Photography.—Captain Morton, the eminent aeronaut, has just built a balloon for the proprietors of the Pictorial World. The first ascent was made on Easter Monday, from Three Bridges. It is intended to make a series of ascents both in the United Kingdom and abroad, when experienced artists will accompany the aeronaut. Arrangements hrve been made for a series of experiments in balloon photography, and by the aid of the latest and most approved apparatus, and the experience of skilled operators, it is hoped to obtain a number of beautiful views of the earth as seen from the car of a balloon. —Daily Chronicle. Mr. Proctor’s Lectures on Astronomy.—The second of this course was delivered on Wednesday evening at St. James’s Hall, the subject being “ The Sun : Ruler, Fire, Light, and Life of the Solar System.” Taking the sun first as an apt emblem of Deity, Mr. Proctor considered its size, mass, might, light, and heat; its structure as revealed by the spectroscope; its tele-
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