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The photographic news
- Bandzählung
- 24.1880
- Erscheinungsdatum
- 1880
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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. 1148, September 3, 1880
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Zeitschrift
The photographic news
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Band 24.1880
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- Register Index 631
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Band
Band 24.1880
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430 THE PHOTOGRAPHIC NEWS. [September 3, 1880. open, and the articles inside have become the delicate and fragile porcelain known as biscuit ware. {To be continued.) The “ Topic ” for next week will be “ On the Advantages of a Note-Book to the Professional Photographer,” by J. Vincent Elsden, B.Sc. (Lond.), F.C.S. THE BRITISH ASSOCIATION. [from our special correspondent.] Sivansea, Wednesday, September 1st, 1880. In the best of weather, the meeting of the British Associ ation has come and gone, leaving in the minds of those who attended it some very pleasant remembrances, but without contributing in any very marked manner to the advancement of knowledge in a special photographic sense. Messrs. Glaisher, Maxwell Lyte, Dillwyn Llewelyn, J. Spiller, A. L. Henderson, J. Millar Thomson, W. Andrews, and H. A. Chapman were present, but although most or all of these gentlemen contributed papers in the Sections, or joined in the discussions, there was not, from first to last, any one communication of a specially photographic character. Two soirees were held in the Pavilion, when electric illumination was resorted to, and on the last of these occa sions Mr. Casella showed some of Crookes’s radiant matter tubes in operation within a darkened room, besides a very efficient and useful instrument known as “ Gimingham's Combination Blowpipe.” Microscopes, spectroscopes, and a variety of optical apparatus were shown by Messrs. Browning, Ladd, and others, besides a new mode of illuminating microscopic objects, described in Section A by Mr. Philip Braham. This consists in using a tiny jet of oxygen directed through gas flame upon lime, so as to get a diminutive lime light, which, by means of the ordinary condenser, is thrown upon the object, and constitutes a very efficient and manageable mode of illumination. The same author showed large crystals of chloride and sulphate of silver slowly formed in strong acid solutions acting over a long period upon metallic silver. Mr. Francis Galton’s lecture on “ Mental Imagery ” was made the medium for the exhibition, on a grand scale, of some very interesting photographic results. In order to get more “characteristic idealizations,” the lecturer had prepared, by the help of a local photographer (Mr. Gulliver), some transparencies obtained by the superposi tion of five or more photographic portraits, and these were thrown upon a large screen by the oxycalcium light. An Italian peasant, a Greek medallion head, portraits of lunatics and criminals (from Dr. Mann’s negatives), and an “idealized Welsh parson,” from five of Mr. Gulliver’s series superposed, were shown, and very good generic por traits, combining the common features of each, were ob tained in this manner. The Swansea meeting has proved of special interest to geologists and metallurgists, as might have been predicted, on the one hand, from the professional leanings of the President, Professor Andrew C. Ramsay, and also from the favourable character of the locality for metallurgical study, the manufacture of steel, iron of all qualities, tin plate, copper, zinc, and lead being here carried out on the largest scale, and all the works were thrown open to us. The only allusion of special photographic interest made by the President in his opening address was the statement of the fact that there was no such thing as pure waler to be met with in nature. Salt beds abound in all geologic rocks, and impart chlorine to all well-waters, so that only by pro cesses of distillation can this element be eliminated. Rain water, in so far as it is ordinarily received upon rocks and drains through them, becomes thereby necessarily con taminated. Dr. J. H. Gilbert, President of the Chemical Section, who delivered his address from the pulpit of the Hunting don Chapel (Section B) on Friday, 27th ult., gave a full account of Dr. Siemens’ recent experiments on the influ ence of the electric light and ordinary daylight upon the growth of plants and formation of chlorophyll, asserting that plants more speedily attain to maturity, with vigorous production of woody structure and brilliant colouring of the flowers, when night was annihilated by the illumina tion of the electric light. The President of Section A (Professor W. G. Adams) made reference to the latest results in spectroscopic science, describing the researches of Messrs. Huggin, Lockyer, Liveing, and Dewar, and finally stated that “Dr. Vogel has pointed out a coincidence of a line of hydrogen with H” (of the solar spectrum). Many side allusions were made to matters photographic, such, for instance, as that by Lieut. G. T. Temple, who stated yesterday, in the Anthropological Section, that the Laplanders, or “ Mountain Lapps,” had to this day a supieme objection to the photographic camera. There are a few other entries in my note-book, but the above represents pretty correctly all that was done in the special direction in which your readers are interested. ROYAL CORNWALL POLY'TECHNIC SOCIETY. The following are the awards in the photographic depart ment : — First Silver Medal.—Mr. II. P. Robinson. Second Silver Medal.—Messrs. Baker, Brownrigg, and Hills and Saunders. First Bronze Medal.—Messrs. Arthur Debenham, Adan) Distin, Hinley, Marsh Bros,, and Thos. Wbaite. Second Bronze M&lal.—Mr. Bridge. HOW TO WORK PAPER SUCCESSFULLY. BY II. A. WEBB.* The paper, after being dried, is fumed for twenty or thirty minutes. It should not be allowed to get too dry before printing; for this will make a great difference in the printing quality of the paper. If it becomes too dry, it will print with less vigour than if in a nice condition for working. This change is quite noticeable in damp, rainy weather, when the paper prints up strong and somewhat red. In that kind of weather, we need it moderately dry. The reason why paper that is kept slightly damp (andl mean by that just sufficiently damp to be pliant and easily worked) prints stronger and richer than when perfectly dry, can be accounted for in this way: when the sensitized paper containing albumenate, chloride, and nitrate of silver is exposed to the action of light, a subchloride is formed and chlorine is liberated ; now, if the paper is slightly damp, the chlorine can more readily unite with a portion of the free nitrate of silver to form chloride of silver, and so a fresh supply will be formed for the light to act upon, and consequently there will be more silver to make up the image ; as the light acts more rapidly in the shadows, it is here where we get the greatest supply of fresh chloride of silver, and necessarily more contrasts, and that is what is needed to obtain vigor and brilliancy. In printing, no rule can be given, as that will have to be governed by the paper, the kind of toning-bath employed, and the extent to which the toning is carried ; this can be learned alone by experience. I use a carbonate of soda toning bath, and carry the toning pretty far, and so need to print quite strong. If the paper prints vigorous, with a clean, and what we might call a metallic, bronze in the strongest shadows, we may feel quite certain that, with equal attention and care in future operations, we shall obtain satisfactory results. When through printing we prepare the acid water! which is made slightly warm in cold weather (just tepid), • Continued from page 413.
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