in electrotyping, 479-481 in the stove or by sinking, 473, 474 with caoutchouc, 476 with fusible metal, 467, 468 precautions to be taken, with plaster of Paris, 465, 466 with the press, 472 Moulds, gelatine, making, 469, 470 washing for electrotyping, 488, 489 Munro's process for coating lead with Muriate of gold, 573-575 of platinum, 575-577 of tin, 572, 573 of zinc, 577 Muriatic acid, 546, 547 Napier on proportion of gold in gilding on the effect of temperature of the ' plan for making silver solution with Negative pole, 68 Neil or neilled silvering, 346-348 Neilling composition, 346, 347 New Caledonia, carbonated and oxidized Pieces in the bath, disposition of, 445, Plumbagc- Plaster of Paris, bronzines on, 534, moulding with, 465, 466 Plated silver, 265, 266 surfaces ornamenting, 340-348 solution, advantages of preparing, of the Wm. Rogers Manufac- with oxide of silver to the cy- solutions, cyanide, management of, patent, 356 Platinic chloride, 178, 575-577 by contact with zinc, 362 by simple immersion, 357, 358 precautions to be observed in, 360 various formulæ for, 360-364 Platinum anode, 197 chloride of, 575-577 coating stoveware and porcelain deposited color of, 357 gilding, by simple immersion, 182 removing, from copper, 360 solution for copper and its alloys, special difficulties in the deposition Plâtre aluné, 456 Plumbago, commercial, 453, 454 fine, 587 for bronzing, 587 gilded, 587 gilt, 454 586, 587 increasing the conducting power of, in the natural state, 586 moulds which can be metallized removing the impurities from, 454 testing the quality of, 586 where found, 586 by chlorine, sulphurous acid, ni- by mercury salts, 613 by most metallic salts, 613 Poles, the, how designated by signs, imparting electric conductivity by, Pot, galvanizing for sheet-iron, 527 Potin, 558 Resistance board or switch, 109 Protochloride of tin, preparation and Retorts, 602 characteristics of. 572, 573 Prot sulphate of iron, 559, 52) of copper, 578, 579 of goil, 5×0 Reversal of polarity in dynamo-electric Reversing by polarization of the elec- Revue In lustrielle quoted, 100 Rasing after dipping. 33 of bright silver-plated articles, Roseleur, claim of, for nickel solution, Roseleur's- for the recovery of gold from for the recovery of silver, 412, for the utilization of waste, modification of Smee's battery, plan for obtaining effects similar to neilled silvering, 348 disposition of, 328 keeping in order, 333, 334 process for dead gilding by gal- vanoplastic deposits, 448- 450 for metallizing wood, porce- Serin & Co.'s method for electro-de- |