Elements of Electro-metallurgy

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E. Palmer, 1848 - Electrometallurgy - 338 pages
 

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Page 301 - ... of the sole working or making of any manner of new manufactures within this Realm, to the true and first inventor and inventors of such manufactures, which others at the time of making such letters patents and grants shall not use, so as also they be not contrary to the law nor mischievous to the State, by raising prices of commodities at home, or hurt of trade, or generally inconvenient...
Page 41 - The poles are merely the surfaces or doors by which the electricity enters into or passes out of the substance suffering decomposition.
Page xviii - The copper plate is also covered with a coating of metallic copper, which is continually being deposited ; and so perfect is the sheet of copper thus formed, that, being stripped off, it has the counterpart of every scratch of the plate on which it is deposited.
Page 26 - ... silver, A, on the top of which is fixed a beam of wood, B, to prevent contact with the silver. A binding screw C is soldered on to the silver plate to connect it with any desired object, by means of the copper wire, e.
Page 118 - Law II. — Every metal is thrown down in a crystalline state, when there is no evolution of gas from the negative plate, or no tendency thereto. "Law III. — Metals are reduced in the reguline state, when the quantity of electricity, in relation to the strength of the solution, is insufficient to cause the production of hydrogen in the negative plate of the decomposition trough, and yet the quantity of electricity very nearly suffices to induce that phenomenon.
Page 299 - enter a room by a door having finger-plates of the most costly device, made by the agency of the electric fluid. The walls of the room may be covered with engravings, printed from plates originally etched by galvanism, and multiplied by the same fluid. The chimney-piece may be covered with ornaments made in a similar manner. At dinner, the plate may have devices given by electrotype engraving; and the salt-spoons gilt by the galvanic fluid.
Page 30 - ... of the strong acids, and that it does not give off poisonous fumes. It usually continues in active operation for six, eight, ten, or more days, when a sufficiency of acid is supplied to it. The zinc frequently demands but one amalgamation; and the time required either for setting it in action, or for maintaining its operation, is comparatively not worth a thought; and, lastly, the expense of working it is reduced to the lowest possible amount, being exactly proportionate to the power obtained.
Page 24 - ... the platinum will, in a few seconds, be thrown down upon the silver as a black metallic powder. The operation is now completed, and the platinized silver ready for...
Page 222 - The beauty of electro-coppered leaves, branches, and similar objects, is surprising. I have a case of these specimens placed on a black ground which no one would take to be productions of art. In the same room with them are a couple of those cases, in which Ward has taught us to grow in this smoky metropolis some of the most interesting botanical specimens. In these cases are contained varieties of fairy-formed adiantums, verdant lycopodiums, brilliant orchideae, rigid cacti, and creeping lygodiums,...
Page 214 - The best solution to be employed is the nitro-muriate of platinum, to which sufficient soda is added to render it neutral. The object to be coated should be smooth, and thoroughly cleansed by potash before the process is commenced. Having proceeded thus far, and the solution of platinum being ready, a fine platinum wire, in connection with the silver of a compound battery, must be placed so as to dip into the solution, but must not be immersed beyond a very short distance. The object to be platinated...

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