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The photographic news
- Bandzählung
- 24.1880
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- 1880
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- Bandzählung
- No. 1138, June 25, 1880
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The photographic news
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Band 24.1880
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- Register Index 631
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Band 24.1880
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JUNE 25, 1880.] THE PHOTOGRAPHIC NEWS. 309 cellent. The opaque is best mixed with an easily soluble brand. In the establishment of MM. Braun and Co., in Dor- nach, a certain brand of Rouen, France, is often employed ; and for the woodburytype reliefs, I used preferably Nel son’s amber gelatine. La Maier, in Munich, and M. Brau- neck, in Mayence, two phototypists of high repute, use almost exclusively Coignet-gelatine. Considering the above facts, we may in general lay down the following principles : —If the gelatine is to be used for those processes where the image—that is, the relief—is to be developed with hot water, especial stress is to be laid on the absorbing quality ; but if it is to be employed for collographic printing, the resisting power should decide ; and, further, of two equally resisting qualities, the less absorbing kind is to be preferred. The matt drying kinds are also better than those drying with a glossy aspect. A further criterion which may yet be mentioned is, that a solution holding ten per cent, ought not to melt below 30° C. But the fear of gelatine containing alum is un founded, as even ordinary kinds are quite free from it. Technologically speaking, we distinguish two kinds of glue: (1) bone, or skin-glue ; (2) cart ilage glue. Accord • ing as the gelatine is prepared from the one or other kind, the richer is it in “glutin ” or “ chondrin ; ” the cartilages containing principally chondrine, the bones, and the skin, glutin. With regard to adhesive qualities, the latter is greatly preferable, and for the reason that the glutinous brands are more serviceable for the making of carbon tissues, and the like, than the chondrinous ones. The latter also sooner gets insoluble. Husnik, the well-known Austrian experimentalist, asserts that the waste of hides and sinews of older animals yield better gelatines for photographic plates than those of younger ones. Dr. Eder, however, holds the opinion that the chondrinous kinds are much better for this purpose, provided they be sufficiently resistant. According to this gentleman, chondrin imparts a greater brilliancy and more contrasts to the prints ; and he further states that one of the first establishments in Germany (Strumper, in Ham burg) has given directions to his manufacturer to employ the (chondrinous) waste of calves’-heads in the making of gelatine. Isinglass, according to Maier, imparts also more brilliancy to the prints. However, there exist at present contradictory opinions on this point. The “Topic” for next week will be “Surveying by Photography,” by Lieut. L. Darwin, R.E., Honorary Secretary of the Photographic Society. Bebiews, The Principles and Practice of Photography Fami liarly Explained. By Jabez Hughes. Twelfth Edi tion, Carefully Revised and Edited by J. Werge. {London: Simpkin Marshall^ and Co., and J. Werge, Berners Street.) With the advent of summer, a new edition of this useful little book reaches us. To many of our readers, Mr. Hughes’ familiar explanation of the art science is already well-known, and to those we may say that in this last im pression they will find chapters on the subject of gelatine plates, and other matters of recent interest. Photo graphers, or intending photographers, who are unac quainted with the little handbook, will find a shilling well spent in its acquisition ; if it does not furnish such full and elaborate information as some of our larger manuals, the explanations given are expressed simply and straightforwardly in a manner that all must understand. Photography: Its Origin, Progress, and Practice. vALecture Delivered by J - Werge. {Same Publishers). Mr. Werge sends us a reprint of a lecture delivered before I the Lewisham and Blackheath Scientific Association. I There are few men more fitted for the task than Mr. Werge, who is known not only as a capable and indefatigable ex perimentalist in the world of -photography, but as one possessing considerable knowledge of the history of his subject. In alluding to the great men connected with the early discoveries of our art, Mr. Werge rightly brings to the front a name that is too often omitted from the honourable roll, that of the Rev. J. B. Reade, who was the first to produce and show a developed photograph, using the term apart from that of Daguerreotype. Mr. Werge traces our art from “ early glimmerings ” of light printing to the latest of our printing processes. By way of illustration, there are prints by the Woodburytype, Collotype, and Dallastype processes, the last example being from a negative of Mr. C. D. Davies, of Blackheath, a well-known amateur, who has cleverly taken an in stantaneous picture of a duck with one of its white feathers in the act of blowing away. La Photographie en ANrERIQUE. Par A’Liebert. {Paris, Hue de Londres, 6.) M. Liebert sends us the third edition of his exhaustive work. It is certainly one of the most complete in the French language, and is profusely illustrated with wood cuts and photographic prints. Not only does the work treat of photographic operations and processes, but it con tains much information on the subject of lighting and general arrangement and organization of the studio. The portion of the book relating to the latter is, indeed, parti cularly well written. HOWTO REMOVE BROWN STAINS, AND REDUCE DENSITY IN GELATINE NEGATIVES. BY A. J. JABMAN. Sometimes it will so happen that a gelatine negative that has been developed with pyrogallic acid becomes very much stained all over of a deep yellow or brown tint, which scarcely can be removed. I have found a means that removes this most effectually, and produces a brilliant clear negative, and at the same time has, as far as my experience has gone, none of the drawbacks that diluted hydrochloric acid have, although chemically it is a compound of chlorine, hydro chloric acid, and sulphate of sodium. I take as follows :— Common table salt ... 1 ounce Common tap-water ... ... ... 8 ounces Place in a small dish, when the salt has all dissolved have ready two drachms by measure of sulphuric acid in an ounce of common tap water. Place the stained negative in the salt solution, and when soaked for a minute, mix the salt solution with half an ounce of the diluted sulphuric acid, and return to the dish, flowing carefully all over the negative ; very quickly the brown tint disappears ; pour the solution on and off a few times, then wash the negative and dry. It will be noticed at the same time that' the density of the negative becomes re duced, also if it is allowed to remain in the solution for a short time. EXHIBITION OF THE PHOTOGRAPHIC SOCIETY. The Exhibition of the Society for 1880 will be held at the Gallery of the Society of Painters in Water Colours, 5a, Pall Mall East, London, S.W. It will be inaugurated by a Con versazione, open to members and their friends, at 8 p.m., on Saturday evening, the 2nd of October. The Exhibition will remain open daily (Sundays excepted), from Monday, the 4th of October, until Saturday, the 13th of November. Admission (from 10 a.m. till dusk), one shilling. It will also be open every Monday and Saturday evening. Admission (from 7 till 10 p.m.), sixpence. Members will be supplied with tickets to admit their friends.
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