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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
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- Englisch
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- F 135
- Vorlage
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
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- SLUB Dresden
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- urn:nbn:de:bsz:14-db-id1780948042-188300004
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- http://digital.slub-dresden.de/id1780948042-18830000
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- oai:de:slub-dresden:db:id-1780948042-18830000
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- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
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- Parlamentsperiode
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- Bandzählung
- No. 1306, September 14, 1883
- Digitalisat
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Zeitschrift
The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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591 little trouble, no fog, and will keep for a great length of time quite clear:— ) No. 1 Solution. Pyrogallic acid 1 ounce Sulphite of soda 4 ounces Citric acid ... ... ... ••• G0 grains Water 16 ounces No. 2 Solution. Liquor ammonia 1 ounce Bromide of ammonia 64 grains Water 14 ounces In mixing No. 1 Solution, care must be taken that acid and soda are dissolved before adding pyro. For use, add in each case water 8 parts to 1 part of solution, and say for a properly exposed half-plate take 1 ounce of each, and mix immediately before pouring on. If any of your numerous readers will give their opinion on this developer, I shall be pleased to hear it. Kettering. 0. H. Ewen. Aroceediugs Of Societies. shall be introduced to the Chairman and the members. Three gentlemen were proposed for election. Mr. Jarman, who was introduced by Mr. Prestwich, said that he had a scheme to bring before the members, which would enable them to piint albumenized silver paper quickly in dull weather, by means of the electric light. He had made some important improvements in storage batteries and dynamo machines, and quite recently fitted up the lamps for the Direct Photo-Engraving Company, which enable them to make the negative, transfer, and block under three hours, a matter of great convenience in dull weather. For photographic printing, he proposed using an arc lamp with a deposit of zinc or some other suitable metal on the carbons, to obtain the most actinic light. By having a large parabolic reflector some four or five feet in diameter, and ’using a current of high tension (150 volts), and low in quantity (8 or 10 amperes), he would get a light of steel blue colour. He had long considered this matter, and was anxious practical photographers should assist him with their experience. Mr. Wellington showed some negatives and prints from an unwashed emulsion containing a little over one grain of silver to each half-plate. He thought they were rather slow, exposure being two seconds—s‘. Mr. Garrett was appointed Chairman for next meeting. London and Provincial Photographic Association. At the meeting held on Thursday, Gth inst-, Mr. W. E. DEBEN- ham occupied the chair. Mr. Henderson passed round two negatives, cabinet and quarter-nlate, of the same subject, to illustrate the advantages in using a weak developer. The conditions were similar as regards speed, exposure, duration of development, &c., the only difference being in the strength of the developer ; the weaker solution yielding an over-exposed negative. He had no doubt if he had prolonged the action with the weaker developer, more detail could have been obtained, as well as the necessary opacity in the dense portions. The normal developer was composed of pyro gallol 2 grains, potassium bromide 2 grains, strong liquor am monia 2 minims per ounce of water. Mr. CowAN thought the gain was perhaps attributable to the difference in the size of the figures that should make the smaller plate at least one-fourth quicker than the other. He found that using equal proportions of pyro bromide and ammonia, it acted very well; he had some very quick plates of Mawdesley’s, which were so thin under ordinary treatment that he could not get a good result; but using 4 grains of pyro., 4 grains of bromide, and 4 drops of ammonia, he was enabled to get excellent nega tives. Mr. Brown had noticed, when testing plates in company with Mr. Cokb, that some would show signs of developing at least five seconds before others from the same batch ; he should like to know what gain there would be in diluting the developer 50 per cent. Mr. Henderson thought the exposure need only be one-half. The sensitometer might be used to determine it; but it would be better to compare the plates. Referring to Mr. Haddon’s green fog experiments brought forward on the 23rd ultimo, he hid mixed a small quantity of the so-called green fog material with gelatine and coated the plates, which he now handed round ; there could be no question about this being green fog of some sort, but he doubted if this was the green fog we are usually accustomed to see, because the plan he had adopted to remove portions of the fog would not affect the silver, supposing any were present. The Chairman doubted whether the substance used by Sir. Henderson to obtain the clear portions could only act when silver is not present. After some further discussion in which the merits of chlorine and bromine water followed by hypo or cyanide as a means of destroying green fog in gelatine negatives, it was stated that the clear portion in one of the plates shown was produced by a gas. The Chairman reminded the members that Mons. Hutinet would demonstrate his method of making enlargements before them on Thursday, 13 inst. ; he had attended the meeting at the Golden Cross, and he thought when Mons. Hutinet came to their large hall he Mould find more room to work in, and the audience would be better able to judge of the results. It wa t decided that all new members, on their first attendance, Ulk in tpe Studis. Mr. C. James, of Vauxhall, sends us an elegant little camera stand made of straight-grained pine, which, besides being well and neatly finished, has the advantage that it is easily adapted for employment on sloping ground, a feature that may well be noted. Photographic SocrETY or Ireland.—The Hon. Secretary, Mr. Alexander Conan, has issued the following circular:—“ The Photographic Society of Ireland are very desirous of holding an Exhibition early in the coming year ; and with the view of form ing as correct an idea as possible of the number of exhibits which they would be likely to collect, I am desired to ask you if you would co-operate in the movement, and if on the accompanying form you would state the probable amount of space you would require. An early reply would be esteemed a favour by your obedient servant, Alexander Conan, Hon. Sec., Stephen's Green, East, Dublin, 1st September, 1883.” A Detective Photographer.—A curious discovery of a diamond fraud was made by a photographer, recently. A diamond expert was offered a very large stone for £1,600. He applied to it all the tests used in the trade, and was satisfied that it was genuine. After he had purchased it, some circum stances occurred which led him to suspect that he had been cheated, notwithstanding the apparent genuiness of the diamond. He took the stone to a photographer, and asked him to send a ray of sunlight through it with a lens. Then it was discovered that there was an obstruction in the stone. A ray which passed through other diamonds clear and bright was stopped in the suspected stone. A powerful microscope was used upon it, and it was discovered that the obstruction was some cement which joined two small stones together, the two forming the magnificent gem the merchant had bought. The two stones were separated by chemicals, and were worth about £120 each. Tit Bits. The Photographer’s Door-man.—Henry Bunting, photo grapher’s assistant, was charged at Worship Street with being drunk and disorderly and annoying foot passengers.—Police constable 416H stated that on Saturday evening he saw the prisoner follow a respectably-dressed person, seize hold of him, and pull him into the doorway of the establishment of his employer, who was a photographer. He was pulling the person in question into the house in order to make him sit for a photograph, and the gentleman was exclaiming, “ I don’t want my likeness taken.” The witness stated that he had received many complaints from respectable persons of this conduct on the part of the prisoner. When anybody passed the shop who was a likely subject for a photogaph, the prisoner followed and solicited them to go in. When charged at the police-station, the prisoner said he did this by | the order of his master, who had instructed him that whenever a sailor, or a navvy, or such like passed by, he was to “ make on to them.”—The prisoner was discharged.
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