Elements of electro-metallurgy, or, The art of working in metals by the galvanic fluid

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Page xxv - Brugnatelli3 mentions that he 'had gilt in a complete manner two large silver medals by bringing them into communication by means of a steel wire with the negative pole of a voltaic pile and keeping them one after the other immersed in ammoniuret of gold, newly made and well saturated'.
Page 300 - Birmingham, merchant, for improvements in preserving and covering certain metals and alloys of metals. Sealed March. 3, 1840. Enrolled in the Enrolment Office, Sept. 1840. The patentee claims the coating of manufactured articles of wrought or cast iron, lead, and copper, and its alloys, with copper or nickel; such coating being effected by galvanic electricity. The next patent was granted to George R. Elkington and Henry Elkington, of Birmingham, for improvements in coating, covering, or plating...
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 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 116 - 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 16 - ... in the arts. Ages to come will perhaps have to thank the inventor, whom we are too apt to forget because he was neither on the council of the Royal Society nor a London Professor, yet still the obligation from the public to Mr. Kemp is the same.
Page 300 - Thomas Spencer, of Liverpool, carver and gilder, and John Wilson, of the same place, lecturer on chemistry, for certain improvements in the process of engraving on metals by means of voltaic electricity.
Page 36 - ... derived from its influence. The accumulation and the deficiency of the magnetic fluid, which determine the place of the poles of this magnet, are probably in fact considerably diffused, but they may generally be imagined, without much error in the result, to centre in two points, one of them nearer to the north pole of the earth, the other to the south pole. In consequence of their attractions and repulsions, a needle whether previously magnetic or not, assumes always, if freely poised, the direction...
Page 175 - ... *exquisite colours will delight the operator, which arise from the decomposition of light, by a layer of different thicknesses of peroxyde. By reflected light every prismatic colour is seen, and by transmitting light a series of prismatic colours, complimentary to the first series, will appear occupying the place of the former series. The best way of viewing these beautiful fairy forms is to place the plate before a window, and incline a sheet of white paper at an angle of 45 over the plate,...
Page 30 - The reason they prefer it for general and especially for heavy manufacturing purposes appears to be, that it does not require the use of porous tubes, nor 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...

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