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The photographic news
- Bandzählung
- 6.1862
- Erscheinungsdatum
- 1862
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- Englisch
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- F 135
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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. 188, April 11, 1862
- Digitalisat
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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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April 11, 1862.] THE PHOTOGRAPHIC NEWS. 171 862. * Continued from page 159, ! iodid : i yellow ■d Alco ¬ lu best emark becomo e have amera, deepest o plate of the he two ill sun- oens in vo was rts. 1* y solar ir it by perties r collo vS upon it may without quently f ether- e whole k again > which s to say found » iced by nnot be they have never before made their own collodion, our directions, if implicitly followed, will yield a good result. It seems pro bable that alcolene may have many important uses, and we know of no practical objection to it, which may not be easily over come by the means stated in the last number. We do not, however, recommend it as a substitute for collodion under ordi nary circumstances, but simply as a valuable addition to com mon collodion which is working badly, either from excess of ether, or from the too skinny character of the pyroxyline. We omitted in the former article to state a good quality of alcolene, viz., that although made with very weak acids, the film is en tirely transparent, and free from opalescence.” “ The character of negatives taken with alcolene is remark able softness and delicacy, and they scarcely acquire tho neces- Sry density without a drop or two of silver in tho developer. This is a kind of negative greatly to be preferred to one in which density is too easily obtained. “ A variety of uses for collodion without ether will no doubt occur to our readers. For instance, in hot climates where common collodion actually boils upon the plate, or sets so quickly as to be unmanageable, alcolene will be tho right thing to use. Or where good ether cannot be procured, or if it is dangerous in the transport, alcolene will again be serviceable. We cannot at present recommend it as a complete substitute for collodion, on the faith of a few experiments, because that Would be getting on a great deal to fast, and overlooking some qualities, which may be considered defects, but it does not cer tainly seem to us that the total exclusion of ether from collo dion may, for many purposes, and in many cases, prove to bo a great gain. “ Some of our readers are probably awaro that an excited collodion film, fresh from the nitrate bath, may be preserved for a long time by pouring plain collodion upon it. The second film of collodion does not adhere to the first, and the nitrate of silver imprisoned between the two films cannot lose its moisture, and by becoming concentrated attack the iodide of silver in the first film. Now plain alcolene, thinned with an equal quantity of alcohol, may be used in the same way as a preservative to a wet plate. “ To make Alcolene, proceed thus:— “Take a slop-bason, capable of holding about a pint. Mako it perfectly clean and dry, and put into it, first 4 ounces of oil °f vitriol, s.g. 1'83, and next 8} ounces of nitric acid, s.g. 1 '400. Stir tho acids well together with a glass rod, and while the mixture is still at its highest temperature, put the bason into a pie dish, and pour into the latter as much boiling water as will bo nearly but not quite enough to cause the basou to float, Tho temperature of tho mixed acids will now be about 175°. Put the whole affair up a chimney, up which tho fumes of the acid can escape ; and immediately begin to put in cotton wool which has been previously pulled out into thin flat tufts. The best plan is for an assistant to put in the cotton wool a tuft at a time, while you immerse it in the liquid, and stir it about with a couple of glass rods. The cotton wool should be the best corded and bleached kind, such as is sold by surgical instrument makers, at about three shillings per pound. Put in as much as you can easily manipulate in the liquid, and leave it in five minutes, counting from the time of putting in the last tuft. Thon remove the bason from tho pie dish, drain off tho acids quickly into a waste acid bottle, and upset the pyroxyline into a pail of clean water, in which rouse it about with the glass fods for a few seconds and then change tho water, and repeat this thorough washing" several times. Lastly, leave the Pyroxyline to soak all night in water, and tho following day "ash it well again in several changes of water, and spread it "nt upon a table, or window sill, to dry spontaneously. When dry it will bo ready to be dissolved in the alcohol. “ The success of the operation depends chiefly upon using acids of tho exact strength indicated, for if they are too weak, the cotton will dissolve in the acid mixture, and if too strong it will not dissolve in the alcohol. The pyroxyline is also very short and powdery, and unless much care is taken a great deal of it will be lost in tho washing waters. 'Pho best plan will bo to procure tho acids of the proper strength, and tho same that we always use in making alcolene, from Mr. Baily, of Wolver hampton, who will supply tho right thing. “ When tho pyroxyline is dry, dissolve it by adding to abso lute alcohol, s.g. -805, about as much as the liquid will cover. Shake tho bottle well, and in a few minutes tho whole will dis solve to a rather thick solution. Iodize by adding any of the usual iodides or bromides dissolved in alcohol, s.g. -820, in the usual proportion ; that is, one part of iodizer to three parts of plain alcolene, one ounce of which will contain about four grains of the iodide employed. 'Pho following day it will bo ready for use, and when iodized may probably be preserved for a very long time without deterioration. We have given these minute and familiar directions for making alcolene, chiefly for tho benefit of those readers who live in those places where good ether and good collodion are no a ways to be got, or where the heat of tho climate renders io use o common collodion open to many difficulties and objec- tonsa .Tnis journal will reach many such readers months J ‘y could procure alcolene from England, and even if REMARKS UPON SOME OF THE APPARATUS EMPLOYED IN PHOTOGRAPHY* BY F. K. WINDOW. Camera Stands. The principal qualities requisite in a camera stand for the studio are, steadiness, and an easy action of the mechani cal parts for raising and lowering the table. There are many designs to be had which perfectly fulfil these condi tions. From its nature this piece of apparatus is almost of necessity somewhat clumsy in appearance when made of wood, as is generally the case, because weight is- required to produce the desired firmness, steadiness might be obtained with a lighter section of material by spreading out the base, as is effected with the field tripod stand, but this would be in convenient in the glass-room, as it would take up too much valuable space. All studio camera stands should have, besides the principal vertical movement, two other movements by which the camera may be tilted in either direction; but these last should only be used upon very rare and exceptional occa sions, excepting for the purpose of placing the camera upon a horizontal level when the floor of the studio chances to be inclined in any direction, and renders a correction in this manner necessary. Generally speaking, portraits are taken with a camera not furnished with a swing-back, and there fore the instrument must be placed perfectly level in order to secure a true and undistorted image of the object placed opposite to it. A neglect of this principle is one of the causes of the want of success some people experience as a rule in getting satisfactory and characteristic likenesses of their sitters ; it is also the source of sloping floors, tumble down walls, and ricketty furniture. In short, it produces a distorted and not a true copy of the object. I have been surprised sometimes to see in publications, where one would not have expected to find such advice, directions given to cock the camera up or down and point the lens at a speci fied part of the sitter’s body in order to get all parts in focus. The picture resulting from such a proceeding, how ever, well in focus, will inevitably be a misrepresentation of the subject. If an object cannot be brought entirely into proper focus when the camera is strictly level, it is a sign that the powers of the lens are being too highly taxed, and the proper remedy is either to increase the distance between the lens and the object, or to employ a smaller diaphragm. To facilitate placing the camera perfectly level, it is use ful to have a circular spirit level let into the table of the camera stand, below the general surface, so that the camera may be placed over it without touching. This will be found a very useful addition, and quite worth the extra two or three shillings that it costs. A tray or shelf should be contrived upon each side of tho stand, somewhere below the table, one for the focussing screen, the other for the plate-slide. It will be found very convenient to have regular places in which to deposit them, and where they are ready to hand. The plate-slide has always to be placed somewhere while the focus is being finally adjusted; it must not be laid flat upon table s to set, > to say, on film al way It is an ics pro re that th, and i- The nitrate etween • of the nitrate rhich it I may be / colour ely due lcolene -known ad to it. arance, quality irregu s a film y collo- water iodizer ssolved ill, but e, and ®), tlio 0 film would >ut the ly, and will b remedy ites, 28 i apply e hav nay bo vitlioul
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