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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
- PURL
- http://digital.slub-dresden.de/id1780948042-18620000
- OAI-Identifier
- oai:de:slub-dresden:db:id-1780948042-18620000
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- 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. 193, May 16, 1862
- Digitalisat
- SLUB Dresden
- Strukturtyp
- Ausgabe
- Parlamentsperiode
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- Wahlperiode
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Zeitschrift
The photographic news
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Band
Band 6.1862
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- Ausgabe Ausgabe 73
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- Register Index 619
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Band
Band 6.1862
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- Titel
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234 THE PHOTOGRAPHIC NEWS. [May 16,1862. F. F. TuoNresoS Yours respectfully, 320 grains 4 ounces. 80 grains 4 ounces. 24 grains 4 drachms 8 ounces. this process an old collodion, very porous and rotten and red with free iodide, is far more sensitive than a new sample The usual experience of the wet plates is here reversed The warm water has no other effect on the plate than to thoroughly open all these pores and render the fl® instantly permeable to the developer. My conviction « this is confirmed by the fact that the picture is in the fil and not on the surface when I use old collodion, and th are on the surface when I have tried new samples whid worked very well wet. Those on the former are very vigo rous and bold with a very short exposure, while the latts develops weak and slow. - a A subject which engrosses our apparatus manufacture now is the best changing box for dry plates in the fiell The system of carrying a separate lot of double backs fu the camera, each containing two plates, is very good, b® exceedingly tiresome to one who, like myself, is addicted ® long solitary pedestrian excursions. Some of our New I 8 " houses have been getting up changing boxes for ster®. scopic plates, but they are all clumsy compared with* little box of British make I have used for two years. * measures eight inches long and five inches high and wid The box constitutes the camera, and a changing box, cart ing one dozen plates, fits inside of it; a leather handle y the top secures the whole. The entire concern, with a PS of Ross’s short focus lens, weighs five pounds when fille with prepared plates, and I have repeatedly carried it 1! one hand during a day’s walk of fifteen or twenty mil; scarcely feeling the weight. It has no name of maker on so I have no means of telling who deserves the great ctedt due for its ingenious construction. In my next I w enclose a few samples of the work it does, and will also g" in full my method of preparing dry plates at the rate ° fourteen per hour. I intend starting to-morrow for two weeks’ driving amol: the mountains of New Jersey and Pennsylvania, and P have some experience to relate on my return. Until thd farewell! which, photographically speaking, means, 1) the weather keep clear and well fixed, without fog COPYRIGHT IN PHOTOGRAPHS. A few weeks back wo mentioned the fact of Mr. Mayall hav obtained a verdict in an action he had brought for the recoz" of certain prints from some of his photographs, which prints had lent for the purposes of engraving. These prints ha been erroneously sold, were copied by means of fresh negat 1 being taken from them by the purchaser of the prints si) 5 by Mr. Mayall. Wo likewise pointed out that the result of verdict did not in any way establish the existence of Copn in photographs. A rule nisi having been granted by the C of Exchequer, calling upon the plaintiff to show cause why verdict he had obtained upon one of the counts of his dec । tion should not bo altered, it was at first expected that question .of copyright would come under discussion; but Court afterwards expressly stated that copyright was not ■: point for consideration, and was quite beside the questiona | issue between the parties. As, however, it seems to be erroned» supposed by some persons that a copyright exists in photogr either by the common law or under the Engraving Acts, i3 be useful to point out how the matter stands. If any such Tv is claimable in a photograph after its publication, it can oik by analogy to copyright in books, which the House of W has, upon more than one occasion, decided does not exist ba common law, but only by statute. These cases were argt, the presence of the common law Judges. Upon thelastd sion the Lord Chief Baron Pollock was present, and he exPnti a very decided opinion against the existence of copyrigc the common law. He said, “ I think common law cannot Si new rights, and limit and define them, because in the oP) (I of those who administer the common law such rights.o8 exist according to their notions of what is just, rig 1 *'0 proper. Weighing all the arguments on both sides, and I Do to the authorities up to the present time, the conclusion 1 J arrived at is, that copyright is altogether an artificial rig • naturally and necessarily arising out of the social ru* When ready to develop a lot of plates, I mix in a chemist’s dropping-bottle half an ounce each of the 2nd and 3rd solu tions. This is my dropping silver solution. If the 2nd and 3rd are mixed together and kept in one bottle for any time, citrate of silver will be precipitated, and great waste incurred ; therefore, it is best to mix fresh every day as above. I then pour into a developing glass enough of No. 1 to cover my plate by flowing, and add one drop only of the silver drops. Flow it quickly on and off the warm plate, keeping it in constant motion. As quick as the solution discolors, throw it away and apply a fresh dose. The pic ture should flash out quickly, and care must be taken that the development be stopped before it fogs, as it is apt to do. When all the details are well out, wash off the pyrogallic acid and fix with hyposulphite of sodium. After which the negative can be intensified to any degree by a cold application of pyrogallic and silver. From repeated experiments I learn by experience that for Uackn^ss, and spoils all the delicacy and softness of his resulting prints. In printing and toning albumen paper, however, we are on the ascendant. The old gold and hypo bath is no more heard of; in fact I do not know a single instance where it is used in a first-class gallery, nor do I know a single amateur who adheres to it. That process is among the things of the past. The printing process now most in vogue is to use thin albumenized paper, not heavily salted : sensitize it by floating one minute only, on a seventy-grain solution of nitrate of silver, made quite alkaline with ammonia, i. e., just alkaline enough to keep itself clear' from colour. If floated longer than one minute, the albumen will lose its gloss, and the print sink into the pores of the paper. The silver solution as above will need to be filtered occasionally, and can be strengthened by adding silver when necessary. After first ammoniating it, as long as it keeps clear it will need no more alkali. The toning most used is the ordinary bi-carbonate of soda and chloride of gold bath, to which some salt, 1 grain to the ounce, has been added. We always clear our prints from free nitrate before toning, by washing and then immersing ten minutes in salt water. Fix with fresh hypo, as usual, and wash in an automatic washing trough. Many advertisements in our papers read : “ by the new albumen process." This simply means that our artists use albumenized paper in place of the old plain ammonio- nitrate process. Its usage is compartively new with us. Mr. Anthony tells us he uses in his paper factory several large barrels of fresh eggs per week, and never has a sheet on hand more than two days old. A word about the so called “ hot water accelerator ” for tannin plates. The term “ hot ” water is incorrect, for if the plate is heated above 100° the edges arc very liable to turn red, and the development is seldom equal all over the nega tive. The most certain method of working is to expose the plate the same as for wet collodion, and then put it in a vertical glass bath, containing water at about 90° heat; allow it to remain there until thoroughly soaked, say seven minutes. Take it out and pour on the developer at the usual tempera ture, the plate being yet warm. The developer is kept best in three stock bottles, as follows :—At least I give my own method not knowing how others do. First bottle. Pyrogallic acid ... Acetic acid, No. 8 Filtered rain-water Keep well filtered. Second bottle. Nitrate of silver Filtered rain-water Third bottle. Citric acid ... ... ... : Filtered rain-water
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