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The photographic news
- Bandzählung
- 6.1862
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- 1862
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 181, February 21, 1862
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Zeitschrift
The photographic news
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Band 6.1862
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- Register Index 619
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Band 6.1862
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[Feb. 21, 1862. thing required. We have not had time to try Mr. Ward’s formula. Will Mr. Hislop do so? Some of our correspondents have sent us samples of collodion for the purpose, which we hope shortly to try.—Ed.] • Ahotographir Tlotes an Queries. Photographic Exchange Club. Bear Sib,—If we consider that the object of the Exchange Club is not only the collection of a stock of pictures, but should be accompanied by an acquisition of knowledge with respect to the working qualities of different processes, and lenses, &c., we must see that the latter part of the object is not lost sight of, for precious, indeed, is such information that most of our pictures convey. I think, if we were to adopt the use of such labels as those enclosed, we should, in the long run, be not the less satisfied:— TO BE REVERSED. Subject ... The Old House at Home Process Fothergill Lens Ross’s 44 in. focus Stop ... | in. Time 2 minutes Light Bright, without sun. • NOT TO BE REVERSED. Subject Vale Crucis Abbey N. Wales Process Collodio albumen Lens Aplanatic 4} in focus Stop & in. Time 7 min. Light Wet, without sun. Their use would obviate another evil attending the writing on the back of prints ; we should not have the words—right, left, staring us in the face when we put it in the stereoscope, such being the case with some that I have mounted, the words being as distinct on the face of the picture as on the back. I have got a greater number of these labels printed than I shall probably ever want, and if any fellow-member would like to use them, and does not find it convenient to get them printed, by enclosing six stamps to me he may receive 100 by return of post. Higher Hurst, Ashton-on-Lyne. John Hollingworth. A Modified Fothergill Process. Sir,—As I have seen articles frequently in your Journal on new dry processes and modifications of others, which I suppose may all have their advantages, perhaps you will allow me to say a few words on a method of preparing dry plates, which is a little different to any I have seen described in your paper, and would much like some of your readers to try it. Being principally engaged in the operating room, but having occasionally done out-door work, and often with dry plates, the method I have adopted in preparing them for about three years past is simple. They are very sensitive, and give good results, and will, I anticipate, have good keeping qualities ; but I have never tried them more than a few days. I first ascertain that my chemicals are in good working order, with fresh plates and pyrogallic development, sensitize a plate as usual, put it into a flat dish containing 40 ounces of water, (this is for a plate 12X10), let it remain until the water flows freely over the surface; take it out, drain for about a minute, then pour over it the following solution, which must be kept on from one to two minutes. Albumen 1 ounce Water 4 or 5 ounces, Glacial acetic acid, 20 drops to each ounce of the above, and to be well shaken in a bottle. This must be free from suspending particles; I prefer it being filtered, or a stock can be put away to settle, as it will keep any length of time; at all events, I have used it six months old. The plate may now be washed, a great amount of washing not being required, as they can bo fully developed without being washed at all, and thereby not being so apt to stain, but still I prefer them being washed. I have tried ammonia in the albumen, but never even liked the idea of putting it to a sensitive plate; I have also tried citric acid, but prefer the acetic.—Yours, &c., T. H—. Durham, Feb. 12, 1862. P.S.—The albumen will not keep if less acid than I stated is added. UO Corxespondents. The First Exhibition of the South London Photogra phic Society.—Specific arrangements for holding a supple mental Exhibition of Photographs at the Crystal Palace have now been made by the Committee of the South London Photographic Society. We hope to be able to publish the conditions in our next. P. C. Riversdale.—Your suggestion has repeatedly been anticipated in various ways, but without practical success. The mere formation of iodide of silver in the film is not sufficient, excess of nitrate is also desirable. M. Poitevin proposed, about two years ago, to add nitrate of silver, about 5 grains to the ounce of collodion. This was to be immersed in, or coated with, a solution of iodide of potassium. The film of iodide of silver in this state is insensitive to light. To excite the plate for use, a solution of nitrate of silver was to be poured over it. In the various processes suggested during the last year or two by II. Bellini, Captain Dixon, and A. Gaudin, nitrate I of silver was added to the iodized collodion. C. O. E.—If you had acted on our suggestion you would have escaped the difficulty. India-rubber is very tardily soluble in benzole, especially in some samples. We recommended dissolving the india-rubber in chloro-1 form, and, if necessary, diluting with benzole. We can now only recoin*I mend you to follow that course. Bi-sulphide of carbon is a ready solvent, I but is not a pleasant smelling article to use. Enquirer.—The lenses quoted in the catalogue you mention are of French manufacture, and we have no doubt but that at the price referred to will be good of its kind. Those of the best English makers are, however, generally much superior in defining power and rapidity, and to those who can afford them, are worth the difference in price. The method of preci pitating silver from a nitrate solution with copper may be used if you prefer it; but the use of a chloride is simpler. C. F. Booker.—The cracking of the collodion film and of varnish film was very fully discussed at a meeting of the Photographic Society a little more than twelve months ago. You will find the matter fully treated at page! 391 and 397 of our fourth volume. A variety of causes were suggested, but a common opinion prevailed that it resulted from traces of the fixing salt remaining in the film Mr. Booker’s difficulty consists in the collodion film cracking under the varnish. Can any of our readers suggest further information as to the cause or remedy. CHIRURGICUS.- The Kinnear camera is one of the most portable and efficient for landscape work we know. If well made it may be very light without being actually fragile, and will answer perfectly for dry plates. The means of obtaining the same advantage by inclining the lens, as are obtained by a swing back, require, of course, very great care and judgment in use. Enquirer, No. 2.—The silver obtained by washing prints prior to toning them, should be precipitated in the form of a chloride by the addition of common salt. The chloride thus thrown down should be well washed and dried. It may then be reduced to the metallic state by placing in a cru cible with double its weight of a mixture of the carbonates of potash and soda, and submitting to a bright heat. . . | Economy.—If there be any silver in your waste developing solutions, it will gradually be reduced into metallic silver, which will be found in a gr powder at the bottom of the bottle. A Novice.—If your folding landscape camera have a sliding body it wil answer for portraits as well; if not, the simplest plan will be to buy an other for portraits and keep the one you have for its own purpose. F. G. L.—See articles on “ Iron Development and Brilliant Prints ” in last volume, also in Photographic News Almanac. A strong iron developer will give more detail, a weak one more contrast. Anastarchus.—We should prefer to line the cistern with thin gutta percha, as described in the series of articles " Amateur Mechanic,” in our second volume. J. W.—The flame of a candle protected by a yellow shade is not likely to be injurious to an excited collodion plate. 2. We should consider the lens of the English maker you name incomparably better than the French one for card portraits. 3. With a soft negative the Rive paper will give you the best prints ; with a very vigorous negative the Saxe. T. G. B.—Sunshine is necessary to the efficient use of the solar camera- Without direct sunshine the condenser is useless. Emily.—The best mode of avoiding stained fingers in photography is to use great care. India-rubber gloves or finger-stalls may be used ; but you re member the old adage about a'cat in gloves ” You may use horn pincer 3 I in lifting sheets of paper from the silver bath ; and some of the numerou8 plate-holders for developing; and by the aid of these, and careful manipl lation, you may avoid “ getting your hands into such a state.” Tom.—Good Scotch or Russian glue may be used for mounting photograph 3 I with advantage ; and will occasion the least tendency to cockling. G. G.—We prefer hyposulphite of soda to cyanide, for fixing negatives. Frank FARLEIGH.—We do not think any especial advantage is obtained in using a bath of greater strength than 40 grains to the ounce, for negatives- . The stronger the bath, the greater the proportion of acid necessary to make . it work without stains or fog. C. F. L.—Wash the inner frames of your dark slides frequently, and take I care to drain the plates well upon a piece of blotting paper. Any accumu- lation of silver in the slide is apt to cause stains. X. Y. Z.—All intensifying processes require that the primary image should have an especial character suited to the method to be adopted. Wherever the negative is intensified after fixation, it is desirable that plenty of de tail and softness should characterize the image in the first place. Whers intensity is gained rather by a change of colour than by piling on addi tional silver, the greatest delicacy will be secured. It is for this reason that many operators prefer the use of bichloride of mercury and iodide 0 potassium. Several correspondents in our next. All Letters, Works for Review, and other Communications for the Editor, should be addressed to the Office, 32, PATERXOSTE Row, London. EXH' Wb 1 conte to he comil for il can F in thi sirabl That some paren an ad the of timati society an inc As Palace Under an ext Would hold a he an the bi We ments Palac and e immei will b of the as to diatel runnil appar conne exhib made sales '’ill i It i of M their and < Possi the a thel emp to e> for । und crea who the requ the । A pate a vei life-s large phot
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