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The photographic news
- Bandzählung
- 6.1862
- Erscheinungsdatum
- 1862
- Sprache
- Englisch
- Signatur
- F 135
- Vorlage
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
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- urn:nbn:de:bsz:14-db-id1780948042-186200003
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- http://digital.slub-dresden.de/id1780948042-18620000
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- oai:de:slub-dresden:db:id-1780948042-18620000
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- Seite 1-72 fehlen in der Vorlage. Vorlagebedingter Textverlust.
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- Bandzählung
- No. 200, Juny 4, 1862
- Digitalisat
- SLUB Dresden
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- Parlamentsperiode
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Zeitschrift
The photographic news
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Band
Band 6.1862
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- Ausgabe Ausgabe 73
- Ausgabe Ausgabe 85
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- Register Index 619
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Band
Band 6.1862
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- Titel
- The photographic news
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JULY 4,1862.] THE PHOTOGRAPHIC NEWS. 321 itted i" covered up C to B, three times as remark >n lens r unire 1862. entirely uncovered by this method during all the time the single shutter is moving from C to E and back, and will be covered up during the time occupied by its descent from ", _ " — much light being again admitted in that time as with the single shutter. In this way three times as much light will be admitted into the camera during one-half of the time of exposure, and during the other half the lens remains entirely uncovered, while, with the ordinary shutter, the amount of the lens uncovered during that period varies between the half and the whole surface. Combining these two, and taking into account the dose proximity of the new shutter to the lens, the respective through the other half of th lens, so that by the time the single shutter will have uncovered one-half of the lens, the other will have uncovered the whole of it, and have admitted thrice as much light in that time. The lens will now remain by tightening the cord, to make them pass onwards, or by allowing them to return to their former position by a retro grade motion. When extreme rapidity is desired, the plates are first drawn into the proper position by tightening the cord, and are, at the proper time, let loose by twisting a small trigger with the finger, when they flash across the lens, and give the requisite amount of exposure. With this arrangement and sufficient sensitive preparation, especially with the dry process, the use of a stand might be dispensed with, and if a view meter were fixed on the top of the camera, the operator, as soon as a chance presented itself, might take aim and pull the trigger. Some of the peculiarities of this form of shutter: these are, that it may be applied to cover any number of lenses—is per fectly under control—and affords a convenient mode of un covering the lenses for ordinary work in the studio; it can be used without any danger of shaking the camera, which is not the case when any rigid body has to be taken hold of for raising the shutter; when used for instantaneous work, it will admit about double the amount of light into the camera that the ordinary form will at the same time, or give an equal exposure in about half the time; or, in other words, produce equal results in that time on preparations about half as sensitive as those required by the ordinary form. By producing a well illuminated image during nearly all the time of exposure, it will assist in counteracting the tendency to feebleness, characteristic of instantaneous negatives. In conclusion, it may not be out of place to mention that the instrument in its varied forms, is patented; but that its manufacture has been undertaken by Mr. Dallmeyer, who is now supplying the public with it, and if it be found to meet the wants for which it is intended, the writer will not consi der his labours thrown away. THE URANIUM TONING BATH. We have received the following from Mr. S. Fisher Corlies, of Philadelphia:— “ I have been so much pleased with the use of chloride of uranium in addition to the alkaline toning bath that I send you my formula: “ Make up the toning bath in the usual way, and after allowing it to stand for half an hour, add one drachm of solution of chloride of uranium (one grain to drachm) for every grain of chloride of gold in the bath, and proceed to tone. The prints are softer and of a beautiful colour, and will not change scarcely any in the hypo bath. I have not seen any formula given for its use, and as it is quite popular among operators hero, it certainly deserves being generally known.” The reports we have received thus far on the use of nitrate of uranium are quite conflicting ; we do not consider it fully settled that it is advantageous; we commend the subject to experimenters. Prove all; hold fast that which is good. Our correspondent is a very high authority, and we do not think he can be deceived; therefore we are inclined to be of the opinion that the chloride of uranium is a good thing to put in the toning bath. We hope it will be tested. Many people think that the virtues of the use of this or that chemical in photographic processes, may be accurately de termined in advance of trial, on already established principles. But they are in error. Photographic reactions are very subtle; the causes and conditions are too nice for out- awkward scrutiny. Thus many questions discussed for years are still undecided, as, for example, the changes of the salts of silver under the action of light, the changes of collodion, etc. Who could tell in advance that iodide of potassium will make plain collodion thin, and iodide of nickel make it thick as jelly. The toning process is es pecially a knotty subject. Our science is truly lagging far behind our facts. Our progress in good degree is empirical. Yet what science .we have we should use; a rush-light is ages.t’ rf whid, tially, “ provid ich ott s are 9 and t sously " the ic cent’ sward t‘ ; way d‘ a fist" nation" teslida e towd"‘ t the b vumber5 edeno evidedl! case,! rest ‘s Jimpel ^7 ly7 and " eed tap’t vt nd, na tr tadv" d bae G6a tyo , e lur250 2 tbe2)‘ amounts of light admitted in the two cases during the exposure will be found to be about as two to one. When a small central stop is used, it would be advan tageous to have the arrangement placed in a central position also; but instantaneous pictures, however, arc now being generally taken with nearly, or altogether, the full aperture of the lens. When the objects are situated at nearly equal distances from the lens this is easily effected by the ordi- nary portrait combination; but fine views are now being taken by Dallmayer’s new triplet lenses, with the full aper- ture, where the definition is perfect, even from the extreme distance to within a few yards of the lens. Before constructing this shutter, the writer had recourse to a contrivance placed inside the camera, immediately in front of the dark slide, which, by pulling a cord caused a longitudinal aperture to descend in front of the prepared Plate, and permitted the maximum power of the lens to act pon the various parts of it in succession for a very short time. There are disadvantages, however, attending the use of this contrivance, which render, it available for instanta- neous pictures only, and but for a certain class even of them. "Oppose, for instance, that this slit be an inch in depth and Ike plate four inches, then each portion of the plate will be Uncovered only one-fourth of the whole time of exposure; And if a large moving object has to be photographed, so as to fill up a considerable portion of the picture, some of the Parts will continue to move after others have been impressed, Vhich must lead to distortions and indistinctness of the image. In such a case it will be seen that, by the shutter Aready described the same amount of exposure may be &iven in one-third the time, since all the parts of the image 4n: formed simultaneously. The only circumstance in which "is is suitable is for an instantaneous sunlight view, com- Esing a number of small or distant objects, and where a “nge in their relative position is of no importance. me most' important application, however, of quick pho- pfaphy is to subjects which are not necessarily in motion, at very apt to move, and where the exposure need not be Mtogether what is understood by the term instantaneous, “ may last from one to two or three seconds. For this Prpose the writer believes the new shutter will be found Wy well adapted, as it is concealed from view and entirely “der the control of the operator, thus enabling him, by a gentle touch to uncover all the lenses simultaneously (if he more than one) at the proper moment, and devoting all m attention to the sitter, to cut off the light the instant any mo on is perceptible, as a slight deficiency in the exposure to a. certain extent, be compensated for in the deve- bnS; The shutter may be placed either inside the camera, tiohnt the lenses, or outside, in front of them, in which posi- plea ' 18 proyided with folding hood, which projects, at of the h considerably in front, and acts as a shade. One part expos °> admits of being so used as to give an excess of Pe to the foreground, whenever that is desirable, the consxPosure may be effected in several ways, according to a string pinee of the operator. One is by gently pulling glide in ih uncovers the lenses, by causing the plates to opposite directions, and the light may be shut off,
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