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The photographic news
- Bandzählung
- 7.1863
- Erscheinungsdatum
- 1863
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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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- http://digital.slub-dresden.de/id1780948042-18630000
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- oai:de:slub-dresden:db:id-1780948042-18630000
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- Bandzählung
- No. 276, December 18, 1863
- Digitalisat
- SLUB Dresden
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Zeitschrift
The photographic news
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Band
Band 7.1863
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- Register Index 619
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Band
Band 7.1863
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of citric acid in 1 onnce water. Mr. Jennings uses a 10-grain solution of pyro (without either silver or retarding acid),until the details are well out. Here, then, is avast difference ; 10 grains of pyro without acid, against Ij grains with acid, there cannot be a doubt which is the most powerful developer, and this of course is (in the result produced), tantamount to an increase of sensitiveness in the plate. The requirements requisite for short exposures with tannin plates seem to be a neutral bath ; bromo iodized collodion ; as weak a solution of tannin as will give sufficient intensity with the sample of collodion used, and a powerful developer. Mirfield, December 12. • COLONEL STUART WORTLEY’S STUDIO. In answer to several inquiries, we have been courteously fur nished by Col. Stuart Wortley with a ground plan and elevation of his recently erected glass-room, and we add a few particulars of its construction. On reference to the subjoined ground plan, it may be seen that the total length of the room is thirty-six feet, the portion really constituting the studio, the only part lighted, is twelve feet wide by thirteen feet long. The unlighted portion, in which the camera stands, is twenty-three feet long by eight feet wide, and the extreme end is divided off to form the dark room. The part marked 0 has a tier of shelves for various pur- poses: On reference to the sketch of the elevation it will be seen that the studio portion is 12 feet high at the ridge. One side of the studio is all glass, consisting of corrugated glass from the ground to 7 feet high, and from thence to the roof clear white glass. . The sloping front light (7) is clear white glass. The opposite side of the studio is opaque, reflected light only being obtained on that side. The roof (4) is also opaque. The only portions having glass are one side of the square or studio portion, and the front sloping portion of the roof (7). With the exception of the glazed parts we have named, the room is chiefly constructed of inch board ing, covered at the roof with asphalte felt. The unillum inated portion is 7 feet high to the eaves and from thence to the ridge about two feet more. The window marked 2 is of orange glass for the dark room. The other small window is to admit a little light when necessary to the unilluminated portion of the room. Each pane in the studio has a distinct set of two blinds, one white and the other black, and the blinds of each pane may each be worked quite independent of the other, so as to secure entire control of the light. The room is well built throughout and carefully finished in every part, making an excellent smoking room when not used as an amateur studio. The total cost of the erection was £113. Col. Stuart Wortley informs us that he will have pleasure in furnishing further particulars to any gentleman who may require them ; either through the Photographic News, or, in answer to letters addressed to him direct, at the Carlton Club, Pall Mall. ALPHONSE DE BREBISSON'S TREATISE ON INSTANTANEOUS DRY COLLODION. BY M. ERNEST SAINT EDSIE. The great desideratum in photography is a collodion that will dry upon the plate, by means of which we can operate anywhere and at any moment, its sensibility diminishing only with time, although the collodion exists upon the plate only in the dry state. This question possesses sufficient importance to tempt operators to undertake difficult re searches in order to obtain its satisfactory solution. Hitherto we have only succeeded in preserving iodide of silver dry, by removing every trace of free nitrate of silver from the saline films deposited on the plate; but the film of iodide that remains is so parchmentized and horny, that it is almost impervious to light and to the developing agents, consequently its sensibility is entirely exhausted. M. Belloc, in one of his treatises, states that dry collodion with tannin is superior to any other hitherto proposed. M. Brebisson devotes a special study to this important question, and we extract from his treatise the principal conclusions at which he has arrived. Photographers have so busied themselves with the sensi tive substances offered by chemistry, that it is almost im possible to present a preparation of any sensitive collodion the efficacy of which shall be due to new products. The discovery of an instantaneous collodion, particularly in the dry state, has always vividly excited the interest of operators; to what substances have they not had recourse to excite this sensibility ? Iodide of ammonium, iodide of arsenic, chloro form, aldehyde, the bromides . . . have all been tried. The greater or lesser rapidity in the sensibility depends, we think, upon a concordance, more or less perfect, in the com position of the different baths employed. Instantaneity is, then, a resulting, and not the result, of simple action. The process described by M. de Brebisson, in his treatise, rests upon the same bases as that of Major Russell, improved by Mr. England. The author has merely modified the pre parations, the object of which is to preserve the collodion, dried upon the plate, in its original sensibility ; and he says that he has arrived at so short an exposure, that it may be regarded as truly instantaneous. The author shares our own views when he states that he has not sought to employ new substances, but only to bring the old ones into the most favourable conditions. This new method will not, therefore, augment the photographic phar- macopa, already too bulky. We will now proceed to examine this new method in its various phases. Composition of the Collodion.—It is above all things ne cessary to have a very sensitive collodion, that works well, as the phrase goes. It may be employed according to various formulas; for every collodion suitable for the wet process, will be equally so with tannin or pyrogallic acid. Only, the sensibility will be different, according to the proportions of iodine and bromine. M. de Brebisson prefers the following collodion, on account of its sensibility, as well as for its constancy and easy preservation :— Sulphuric ether at 60° 300 parts Alcohol at 40° 75 „ Pyroxyline ... 4 ’ To 100 parts of this collodion, become limpid by long standing, add 15 to 20 parts of the following sensitizing solution :— Alcohol at 40° ... lOOparts Iodide of cadmium ... ••• 10 „ Bromide of cadmium 2 »
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