The photographic news

• Bandzählung: 35.1891
• Erscheinungsdatum: 1891
• Sprache: Englisch
• Signatur: F 135
• Vorlage: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: SLUB Dresden
• Rechtehinweis: Public Domain Mark 1.0
• URN: urn:nbn:de:bsz:14-db-id1780948042-189100009
• PURL: http://digital.slub-dresden.de/id1780948042-18910000
• OAI: oai:de:slub-dresden:db:id-1780948042-18910000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

No. 1. grains ounces No. 2. solution of potassium cyanide, a 100 10 100 100 10 grains ounces and which, I think, is a slight modification of Dr. Monck- hoven’s method. The following are solutions required :— Mercuric chloride Potassium bromide Water Silver nitrate Water To this last is added PHOTOGRAPHY AT THE WORLD’S FAIR. Our American cousins are exercising their minds as to the rules and regulations which will be framed at Chicago for the government of camera-bearers. Says the Beacon: — “Photographers, through their various organisations, are preparing to press on the executive of the Columbian allowed to cover the plate. The plate must now be watched closely, and, as soon as it is whitened through until all but the highest lights are changed, it must be taken out and immediately washed. When sufficiently washed, it is placed face downwards, as before, in a rather weak solution of ammonia until the half-tones only have blackened through, when it is again placed under the tap for a few seconds just to stop the action of the ammonia going any further. After this has been done, it is finished by placing it in a solution of sodic sulphite about a quarter the strength of a saturated solution, until the high-lights Pretty Miss Armytage Moore is the subject of Piccadilly 8 portrait this week. Owing to the fact that the lady is looking into a mirror placed at her side, there are, to all intents and purposes, two Miss Armytage Moores represented in the picture. As Piccadilly jokingly remarks : “ Of vigorous intellect, Miss Moore might most properly obtain large damages from Mr. Bassano for a portrait which proclaims her beside herself.” It is said that, during his passage from America, Prince George of Greece had a very unpleasant time of it. There were over one hundred and fifty American young ladies on board, and their attentions to the Prince became annoy in g and oppressive. N early all the ladies had cameras for taking instantaneous photographs, and every time that the Prince appeared on deck over one hundred cameras were levelled at him. Latterly, the Prince held his hands to his face when he came on deck, but even this was no protection from the snaps of the instantaneous photograph. During the latter part of the voyage he remained below. Even Royalties do not want to be always on view. permanent intensifier he has ever used, and considers it to supersede all others. Certainly, if a clear and vigorous negative is required, it is, without doubt, a splendid one to use. However, where permanency is required, all mer curic intensifiers should be used with caution, as com pounds in which mercury forms a part are looked upon by most experimenters as unstable substances. I will now go on to describe a method of treating negatives that require strengthening, which I have used very successfully indeed for a long time, and one which is a good advance towards the ideal. This method is not entirely my own; it was, to a great extent, published in one of the photographic papers a long time past, but, as it does not seem to have attracted the attention of many photo graphers, it will no doubt be new to some of you. It is tolerably well-known that, if a negative is first whitened with mercuric chloride, and then blackened with ammonia, the density is considerably greater than if it had been blackened with sodic sulphite. Now, as ammonia and sodic sulphite can be used at the same time, or one after the other upon a plate, without any harm coming to it, I take advantage of the different strengthening power strength in the high-lights as in the case of an over-ex posed negative. The negative is bleached entirely through, including the highest lights. Then, after washing, it is placed in a solution of sodic sulphite until the half-tones only are blackened through, after which it is finally immersed in a rather strong ammonia solution until the blackening is complete. Thus, it will be seen that not only can either the high-lights or the half-tones be strengthened as required, but, by varying the length of time of immersion in either solution, and by varying the amount of bleaching, almost any result can be obtained. I must draw my paper to a close without speaking of the chemical changes which take place in all these oper ations, neither can I speak on the third method of strength ening negatives, viz., the powder process, although much use can be made of this process in the artistic treatment of negatives; but must content myself with the hope that some may have learnt something from what I have already said, or that fresh ideas may present themselves. of the two chemicals in the following manner. Supposing I have a negative which I desire to strengthen more in the half-tones than I do in the high-lights, I proceed as follows. The plate is laid face downwards in a dish, the ends being supported on a couple of pieces of match, so that the face of the plate does not touch the bottom of the dish. The mercuric chloride is then poured in and are blackened through. It is then washed as usual. It will be obvious to all of you that this method gives to the half-tones a greater proportion of strength than it does to the high-lights, especially if the bleaching process has not proceeded too far. This method is equally applicable to a negative which requires a greater proportion of which produces a precipitate. The cyanide must be added gradually little by little and with agitation. After a time the precipitate will redissolve, and the cyanide must be added until only a very little of it is left undis solved. The strength of the cyanide recommended by Captain Abney is 100 grains to the ounce of water. After the plate has been thoroughly freed from the fixing agent, it is bleached in the mercury solution, and, after washing, is placed in the silver solution until it is blackened right through. Captain Abney says this is the best and most Exposition the necessity for a special department, or otherwise a full recognition of photography in the great show. It is no doubt of great importance that every facility should be given, and every inducement held out to make it the greatest and most truly representative of the best results of the art from all over the world, but it is not less important that measures should be taken to prevent the management from trying to make up for its extrava gance in paying absurdly large salaries to itself by taxing not only American citizens who have, by their guarantee, made the Exhibition possible, but also the strangers whom it is trying to allure within its gates, or, at least, those of us and them who happen to be accompanied by their hand-cameras. That our Gallic neighbours did so is no reason why we should follow the bad example, and, if our ‘ liberty ’ is more than a mere name, we will not submit to the imposition. “ It would not, of course, be convenient, and there fore not advisable, to give permission to employ cameras on tripods in such crowded places, but there cannot, and should not, be any objection to the free use of hand or detective cameras.”