Furnace, cylindrical, for coloring in German-silver, 208, 257, 258 gilding, 172, 173 for gilding fine wire, 231-234 Fusible alloy, casts of, in galvanoplastic alloys, containing mercury, 468 metal, Darcet's formulæ for, 467 Galvanic batteries, 68-93 couple or elements, 68 two metals forming a, 513, current, 69 decomposition of double salts, 117 oxidizing, effect of imperfect resisting properties of, 524 Galvanizing by immersion in molten zine, 523-581 dross in, 529, 530 drossing in, 529, 530 of iron in the United States and pot for sheet-iron, 527 Galvanoplastic art, development and great importance of, 21, 22 proper baths for, 423 bath, 426-429 baths for silver or gold, 508 copies of daguerreotypes, 451 deposits on patterns without de- j livery (undercut) and which are deposits upon metals with adher- methods for originals in high re- lief with gutta-percha moulds, operation, duration of, 503, 504 with gold or silver, 506, 508 the future of, 512 Gas furnace for immersion gilding, 170 moulding with, 469, 470 moulds, making, 469, 470 deposit, pure yellow correcting, 195 false, of brass, 133 loss of, in acid pickle, 185 perchloride of, treatment of, when preparation of, 188 proportion of, in electro-gilding so- Gore, G.- on cleansing and plating articles on Fearn's process of electro-tin- on gilding iron and steel, antimony, on the electro-deposition of anti- Gore's dead gilding solution, 218 for stopping off varnishes, 339 and Wilde machines, results of comparison of economy of, starting, 98, 99 tension of the current in, 102 work performed by, at differ- M., improvement in the construc- Graphite, 453, 586, 587 Ceylon, 483 Green- gold preparing, 508 on brass, 617 or antique bronze, 533 Grenet battery, 87 constitution and electro-mo- Grove's battery, 85-87 constitution and electro-motive Gum elastic, 570, 571 moulding with, 470-476 Half-dead gilding solution, 218 Hanson's patented process for electro- Heillier's process of tinning, 162, 163 Hess's plan for regulating brassing process for tinning articles of zinc, High relief, Lenoir's process for, 497- speeds with dynamo-electric ma- Hoe's electric connection gripper in machines for electrotyping, 479- 494 Hollow objects, cleaning, 45, 46 Hot baths, electro-gilding in, 199-213 Hydraulic press for electrotyping, 480, 481 Hydrochlorate of zinc, 577 preparation of, 547 1 depositing solutions difficult to electro-deposition of copper upon, gilding and silvering in the United gilding and silvering without pre- sheet, dipping in the galvanizing solutions for deposition, 398-400 wrought and cast, brassing bath zinc, lead, and tin, unsatisfactory Jacoby and Wagner, discovery of the Jacoby's gilding formula, 220 Jewelry, scratch-brushing, 51 Jordan, C. J., experiments on obtain- Keene's cement, 456 Kettles and boiling pans, 599, 600 cast iron, for electro-silvering Kitchen utensils, tinning, 157 |