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The photographic news
- Bandzählung
- 7.1863
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- 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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- Bandzählung
- No. 250, June 19, 1863
- Digitalisat
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Zeitschrift
The photographic news
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Band 7.1863
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- Register Index 619
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300 THE PHOTOGRAPHIC NEWS. [June 19, 1863. 3rd. If the litmus paper be properly prepared, it will show traces of any appreciable acidity, with either nitric or acetic acid; but we always prefer trying a plate to trying litmus paper. The exact amount of change in litmus paper is not a certain guide : trying a plate is.—Ed.] Ulk in tbe Studio. The Royal Society.—We have pleasure in announcing that Mr. William Crookes, whose name is well known to the readers of this journal, was recently elected a member of the Royal Society; an honour the more valuable because of the large number of candidates and the small number of those elected. Plate-Cleaning PREPARATTON.—We have been for some time past using Werge’s Plate-cleaning Solution, received from Mr. Hughes, of Oxford Street. It is the most efficient article we have used for the purpose indicated. The instractions on the label direct that the plate should be washed first and then finished with a little of the solution on a tuft of cotton wool. We have, however, used it without any prior preparation of the plate, whether new or old, old and dried films being removed by it with surprising ease, and a chemically clean surface obtained at once. We can strongly recommend it. We have also tried for the same purpose a preparation in powder, to be used dry. It is entitled “ Photographic Polish,” and is prepared by Sanderson Brothers, of Eccleshall. It is applied with a piece of cotton cloth to the glass, without water or other vehicle. The plate must, of course, be freed from old films, &c., first. This powder then gives a good polish. Double Sulphate Developer.—Messrs. Beckett and Willis, of Scarborough, write :—“ Wo enclose you a few more specimens of prints from negatives developed with the double sulphate of iron process as given in our letter about a fortnight ago, which appeared in your paper. We have received several letters since it was published, complaining that the persons that had tried it could not produce the same results. Two or three others wrote to us to thank us for the information, saying that they could produce beautiful pictures with it without any after strengthening with pyro and silver. This is a proof that those that did not succeed could not have used chemicals in proper condition as we have not the least trouble to produce good results in every case with less than half the exposure required for the old process with the ordinary sulphate of iron. You will be able to judge from the prints the class of negative they have been taken from. As a further proof of what we state we will send you one of the negatives to look at and you will then see the kind of negative it produces. These prints are toned with the same formula) that we gave in our last letter, chloride of lime and gold. Almost any tone can be produced with this bath : we have toned these few prints different colours to show what can bo done with it on the new enamel paper ; it may be as well to say that this paper was bought of Harvey, Reynolds, and Fowler, of Leeds, but we have several samples from other places that are equally as good as this.” [The negative re ceived is very fine indeed, at once soft and brilliant, and the prints delicate, vigorous, and of fine tone.—Ed.] U0 Correspondents. L. L. II.—The orange-flashed glass is coloured with silver and will resist actinic rays well. The brown pot metal may be used in a dull light, but not if full sunshine fall upon it. We do not know of any elastic dressing for woven fabrics, except solution of india-rubber or a varnish of boiled oil. Nitric acid has generally been regarded as injurious in a developer for negatives; but we are not sure that it is with good ground. In some recent experiments we found it gave great brilliancy, without injuring the intensity of the image. Good prints from your negatives are worth exhibiting. Alpha.—The lime bath is most favourable to the production of black tones Use an intense negative, print deep, and tone until a little more than the desired depth of tone is required. By adopting this method you should have no difficulty in obtaining black tones. Calx.—You are scarcely sufficiently clear as to the appearance of the stains of which you complain. Do they consist of dead white reductions of metallic silver? From your description it appears very probable that it arises from some kind of floating matter, or scum, on the surface of the silver solution. We have occasionally known stains arise from the use of a dipper which held a portion of the solution in its curve. To avoid such an annoyance, we prefer to use a dipper with a shoulder, instead of a curve ; or if it have a curve, as many of gutta-percha or ebonite have, we pierce the bottom with one or two holes, so as to prevent it holding any of the solution. We see no reason to suppose that the fault is in your collodion. An Old Amateur.—The stains in your prints are the result of partially im- perfect fixation, arising most probably from the prints sticking together in the hypo bath, which was probably weak or old. Tyneside.—You do not seem quite to understand the description referred to The copying box described takes a plate 12 by 10 ; it is three inches deep from front to back, that is, there are three inches depth of wood in the frame. In the front end the negative is placed, and to the other end the flexible body is attached. When working this flexible body is attached to the lens. 2. The negatives are laid into the rabbet of the frame intended to hold them, and kept in position by a small hasp or turn button, which presses on the edge. A base-board of about three feet long will answer your purpose probably. That is if you use your quarter-plate lens, pro bably of about 6 inches focus, for the enlarging. If the box which holds the negative have a capability of extending to about 9 inches, and the camera to about 18 inches, that will enable you to enlarge two diameters. We do not remember the price of the box to which you refer. 2. If you added 10 grains of citric acid to 5 grains of sulphate of iron in an ounce of water, silver may be added freely without fear of decomposition. We have placed such a solution with silver added in sunlight for five minutes without any decomposition. 3. You obtain very clean pictures by wash ing and redipping. Clean pictures ought to be obtained without that troublej; hut did you obtain any increase of sensitiveness ? T. II. REDIN.—The metallic spots on the paper, to which you refer, are a very serious annoyance ; but we regret that we do not know of any means of avoiding them, nor of any paper which possesses certain freedom from them. Photos.—One of the greatest difficulties in the way of giving exact formula) with chloride of lime, consists in the fact that it is a very uncertain com pound, the amount of chlorine varying in different samples, and indeed continually becoming less with exposure in the same sample. There is no especial quality prepared for toning purposes, nor do we know of any advantage which would be gained if there were. Your prints exhibit a virulent form of mealiness, most probably due to excess of chloride of lime. You should have used hot water in making the solution. In using the gold and carbonate of soda hot, coldness is the result of overtoning, and mealiness the result of its over rapid action. E. L., Chester.—We have never found that the prints toned by the lime bath reddened more in the hypo than those toned by other baths ; but wc have noticed that those toned in the lime bath, which look red when wet, often become very black on drying. Tyro.—It is desirable, if possible, to have light from both sides in the glass room, but is possible, nevertheless, to obtain very good pictures in a studio lighted from one side only. The general design of your room appears good ; you do not state the extent of glass you intend to have, but, judging from your sketch, we should think it desirable to have a little more, and nearly twice the amount of space overhead opaque. K.—The prices of books, and other articles, are generally stated in adver tisements, not in literary notices. The priceof each number of “ Adjutor,” containing five photographs, is fifteen shillings. J. Smith— Lamp-black and whiting, mixed with size or thin glue, in suit able proportion, will give a very good dark distemper background. F. M. C.—Bromide and iodide of lithium are somewhat expensive salts at present. A few years ago we paid a guinea an ounce for some. They can now be purchased at about 8s. or 10s. an ounce. Possibly they may become cheaper if the demand increase. 2. Bromide of cadmium is of somewhat variable constitution, some samples containing more water of crystalliza tion than others, and many samples containing a good deal of water mechanically combined. 3. Bromide of potassium is much more sparingly soluble in alcohol than iodide of the same base. 4. It is always desirable to allow collodion to stand for a day or two after iodizing, before use. G. J.—Your cards look rough and coarse as you state; but it is chiefly from want of rolling. Get a rolling-press : there are several good anil cheap ones in the market. The large ones of Bury, Brothers, are capital. One of the most efficient small ones we have seen is that of Mr. Jabez Hughes ; it gives a surface almost rivalling that of enamel paper. Japheth.—The sentence in the work you quote, stating rapidity of action in lenses to be a matter of chance, is simply nonsense. The primary source of rapidity depends, other things being equal, upon the relation of aperture to focus ; the larger the aperture and the shorter the focus, the more rapid will be the action of the lens. As a general rule, the largest aperture with which single landscape lenses can be worked is one-twelfth of the focal length, and a much better result can be obtained with an aperture half the size. Ordinary portrait lenses are generally made with their full aperture one-fourth or one-fifth of the equivalent focal length. Quick-acting portrait lenses have their full aperture about one-third of the focal length. In the lens used in Skaife’s pistol camera the full aperture is nearly equal to the focal length, and hence its great rapidity. Troubled.—The negative collodion of the maker you name is, we believe, simply iodized. The spots and streaks of which you complain will pro bably disappear on adding a little of a bromide ; say half a grain to each ounce of collodion. R. P.—You had better adhere to the method you have found successful. The prints are very good. S. T.—We cannot undertake commissions to select lenses. Our time is fully occupied with our own absolute duties. An Old Subscriber.—We have not heard that a photographer has been sent out to Chili and Peru for the purpose of taking a series of photographs for the British Government. Several correspondents in our next. Photograpis Registerel During the Wast @@Aeekt. Mr. Samuel Walters, 3, Falkner Crescent, Bootle, near Liverpool, Photograph of the Royal Mail Steam Ship, Scotia. Photograph of the Confederate Steam Ship, Florida, Mr, Charles Millington Drayson, 13, SU George’s Street, Canterbury, Two Photographs of the late Dr. Russell, Canon of Canterbury. Mr. James Halsted Bond, 42, Darlington Street, Wolverhampton, " Portrait.” Mr. John Marchbank, Belgrave Place, Bradford, Photograph of M. W. Thompson, Esq., Mayor of Bradford. *9 The Publisher respectfully requests that all remittances above 3s. may be made by Post-Office Orders, payable to Thomas Piper, at the Chief Ofice, St. Martin's-le- Grand. Sums below 3s. may be remitted in postage stamps.
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