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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
- Digitalisat
- SLUB Dresden
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- Public Domain Mark 1.0
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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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- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
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- Seite 1-72 fehlen in der Vorlage. Vorlagebedingter Textverlust.
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- Parlamentsperiode
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- Wahlperiode
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- Bandzählung
- No. 200, Juny 4, 1862
- Digitalisat
- SLUB Dresden
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- Ausgabe
- Parlamentsperiode
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- Wahlperiode
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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
Band 6.1862
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JUIy 4,1862.] THE PHOTOGRAPHIC NEWS. 362. .319 e wen been sount alising lg. If result- er, the matter, follow I add- exces mposi itrated 1 char 1 until ad tit f hare 1 with >d to a epared er, re nds, is in the liquid, tailine rynes i erust d into as the > cool, h cot; n and heated c acid, ing * ate of ves at of its lerable ne (as nposi- a pro- ating until a the Thes sater ins of xcom- i em- nany n in ing eight eadilf r tr) pred rtrat accob’ of th' is th' tartar and treat The ing • Iti terest. of its potash salts, which is the one most usually employed in I preparing, it will be of immediate as well as of future in- terest. Citrate of potash is formed by neutralising citric acid I ith carbonate of potash. Upon allowing the solution ' to evaporate spontaneously, the salt separates in the form w transparent colourless needles, united in stellate groups, the salt thus formed is tribasic, containing three equivalents । of base to one of acid (citric acid being in this respect analogous to phosphoric acid, already described). The crystals have an alkaline taste, and are very deliquescent, I dissolving readily in water. Citrate of potash is insoluble alcohol. The monobasic citrate of potash (containing one part of acid to one part of base), is formed by exactly neutralising one part of the acid with carbonate of potash, M then adding another part of the acid. Upon allowing ( rec solution to evaporate at a gentle heat, the salt is depo- t sited in large transparent prisms, permanent in the air t And having an agreeable sour taste. They contain four I sguivalents of water of crystallization which are entirely I Eiven off at the boiling point of water, leaving a gummy I iguid, which on cooling solidifies completely into a ra- diated mass of needle-shaped crystals of the anhydrous I lt, which are decomposed at 150°C. The salt dissolves lightly in boiling alcohol and crystallizes therefrom on "oling. Pormiate of Potash.—Now that formic acid and its salts •re likely to be employed in photography, it is of some im- Portance to the experimentalist to be enabled to know what Srethe characteristics of these bodies. The neutral formiate 8 formed by neutralizing the acid with pure carbonate of Potash, and evaporating. It crystallizes in white transpa- "ent cubes, which are anhydrous. They taste bitter and Rustic at first, and afterwards saline and cooling. They “eliquesce in the air. An acid salt is also known, but it is fvenmore deliquescent than the neutral salt. It is prepared I by dissolving the latter in concentrated formic acid and •'reporating. It is of no particular Interest. may especially mention “ Castle Acre, Norfolk,” a fine old ruin, with overhead an angry-looking sky, giving a peculiarly picturesque effect to the photograph. “ At Woolmer, Hants,” is another very fine picture; as is also the “ Wagoners’ Walls, Hants.” A photograph of the “ Begonia Rex ” is a good picture, and an effective example of a photo graphic difficulty overcome. Mr. Gladwell sends specimens of a series of very large photographs, by continental artists, amongst whom are Alinari, Cuccioni, and others. The majority of these are magnificent photographs, and many of them of subjects new to the country, and are well worthy of careful examina tion. Wo before omitted to notice, as by far the best card por traits in this Exhibition, three small frames sent by Mr. Hawke, whoso pigtures we have before noticed in these pages. Round, vigorous, and singularly brilliant, these qualities are obtained without ahy sacrifice of delicacy or softness. The tone is rich and warm, and the pictures are in every way satisfactory. Mr. Skaife sends a neat glass case, containing a pistol camera, and a selection of the very charming little photo graphic gems, which he styles chromo-crystals, as well as some very respectable enlargements on paper, about quarter size, produced from the miniature glass positives yielded by his waistcoat-pocket camera. The only contribution in apparatus which has come under our notice is one of the excellent rolling presses of Bury Brothers, of Manchester. Several other interesting contributions have, we under stand, been promised, but have not, as yet, from some cause, made their appearance. Amongst those promised specimens, were a series of Mr. Breese’s exquisite stereoscopic transpa rencies ; we shall hope to see them in the Exhibition shortly. The South London Society’s first Exhibition is, as a whole, decidedly a success, with but very few drawbacks: the chief of these is, perhaps, the catalogue, which is scarcely so perfect or correct as might be desired, possibly, from being managed by a committee, instead of one responsible officer, in such matters the old adage relating to too many cooks often proving true. As a whole, however, we congratulate the society on the successful issue of the undertaking. SOUTH LONDON PHOTOGRAPHIC EXHIBITION. Ws proceed briefly to conclude our notice of the pictures sxhibited at the Crystal Palace, by the South London Pho- graphic Society, which, we believe, continue to excite a 478 share of attention amongst visitors. The specimens of floured photographs are not numerous, the committee, as "e understand, having rather repressed, than encouraged, tontributions of that kind, as not of a strictly photographic SAracter. There are a few very fine coloured pictures, however, 8to which we may especially refer, is a portrait of a Spanish a by Macandrew, painted by M. Lafollie. This is an tirable specimen of oil painting upon the photograph ; "'colour is quiet and mellow, low in tone, but still rich dad vigorous. The olive tint of the Spanish complexion is Ufliate and transparent. Altogether, the head is thoroughly "I painted. Mr. Wall exhibits the only solar-camera pic- . re contributed; this is a life-size head of a lady painted । oil, a plain print from the original quarter-plate negative Eaced beside it, shows how admirably the likeness is pre- tnved. The painting is brilliant, but not crude or glaring, 0 flesh being rich and transparent. It is one of the best coloured solar-camera pictures we have seen. There are me other coloured pictures not needing especial notice. . NIr. Warner contributes some prints from enlarged nega- t,68, some of which arc very good indeed, and well worth in, attention of photographers generally, who are interested of enlarging their negatives by a method within the reach theverzsone. Here are exhibited, side by side, prints from ti° n ginal negatives, and prints from the enlarged nega- A aiording full facilities for comparison. arrivangst some wet collodion specimens, which it seems order" ate, and hence were not placed in their regular- All tar some very fine landscapes by A. K. Macdonald. 168 are very good, and some very fine indeed. We NEW INSTANTANEOUS SHUTTER. BY A. MANN, M.A. So many contrivances have of late been brought before the public for regulating and reducing the time of exposure of the prepared plate in the camera, that, were it not for the great importance now attached to instantaneous photography, some apology might be deemed necessary for again calling attention to this subject. The difference between the so- called instantaneous pictures and those produced by a much longer exposure, both in commercial value and artistic merit, is now inducing the majority of photographers to turn their attention eagerly to this branch of the art, and the question so often asked is, not whether it be worth while to aim at instantaneous results, but how can they best be obtained. For this purpose, in addition to very sensitive chemical pre parations, it is important to have a lens capable of being used with a large aperture, so as to admit a considerable amount of light into the camera in a very limited time. 'The quick-acting lenses, however, now manufactured by the first English opticians, seem admirably adapted to supply the wants of the photographer in this respect; but it occurred to the writer, some time since, that none of the arrangements used for affording the exposure rendered sufficiently available the advantages which these lenses possess. The most com mon method of giving what is termed an instantaneous ex posure is, by removing a plate, or some opaque substance, from before the lens by lifting it up or drawing it to one side, and replacing it as quickly as possible. A little con-
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