proportion given above, well shaken, and then run into bars. The new alloy, to which the name of sideraphite, or changeless iron, has been given, is said to have the appearance of silver or platinum, and not to be dearer than ordinary white metal. It will resist the action of sulphuric acid, is not attacked by the organic acids, and very slightly so by the inorganic acids. § 194. Alloy for Horology.-The following alloy, suited for the sockets of pivots of watches, was invented by Mr. Bennett. It consists of gold 31 parts, silver 19, copper 39, and palladium 11. He states that this alloy melts at a lower temperature than gold, and is harder than hammered iron. It has a reddish-brown colour, is as fine-grained as steel, and works as easily as brass, but its friction is much slighter than on ordinary pivots. Its most valuable property is that the oil it absorbs is not decomposed, but remains pure, in a fluid state. It has still greater advantages over sockets of fine stone, as it is not apt to break, is susceptible of a high polish, and is less costly than hard stone. For other miscellaneous alloys see also p. 338. Air, 16 Air-drying stove, 143 Alcohol, 308 Alfenide, 235 Algiers metal, 261 Alkaline earthy metals, 7, 37 by compression, 73 conductivity of, 46, 49 effects of impurities, 67, 71, 72 for calico printing rollers, 368, 370 heat by combination, 72 meaning of, 80 uniformity of, 67 Alumina, 52, 58 Aluminates, 58 Aluminium, 7, 36, brass, 220-222 bronze, 212, 220-222 silicates, 59 Amalgam, bismuth, 282 cadmium, 283 copper, 283 for tin, 281 Amalgam, for tinning, 282 magnesium, 287 potassium, 288 sodium, 288 Amalgamated copper plates, 283 Amalgams, 2, 24, 280 for silvering glass globes, 371 chloride, 54 Amperes, 220 Anatomical preparations, alloy for, 273 Anderson, 78, 113 Annealing, 141 Antifriction, 230 Antimony, 1, 7, 27, 225 oxide, 27 Arsenic 1, 4, 7, 28, 277 Arsenious acid, 28, 319 Ashberry metal, 263 Assay offices, 341 Atomic proportion, 211 weight, 9-11 Australian coinage, 293 Bismuth, 7, 25 amalgam, 282 flowers of, 26 oxide, 26 sulphide, 26 -tin alloys, 266 Black flux, 319 Black jack, 35 Blacklead crucibles, 61, 339 Blowholes, 138 Blown castings, 148 Bobierre's metal, 112 commercial, 81 containing iron, 112 crystallisation of, 85 definition of, 80 direct method, 81 ductility of, 103 malleability of, 88, 103 manufacture of, 124, 127 melting-point of, 83 properties of, 81, 100 solders, 120 strips, 142 tensile strength of, 86, 88 varieties of, 87 wire, 103-105 Brassfounders' pots, 143 Braziers' solder, 85, 120 Brazing, 223 Bright gold, 294 Bronze, 2, 156, 162, 166 lead, 159 phosphorus, 159 zinc, 158 casting of, 232 Chinese, 224 colour of, 165 composition of, 157 for bearings, etc., 190 manganese, 201 modern, 158 phosphor, 180, 192 Brown gold, 291 Burin, 212 Burnt iron, 29 sand, 146 CADMIA, 1 alloys, 271 Cadmium amalgam, 283 Caesium, 39 brass, 124 brass furnace, 125 Calcium, 8, 38 fluoride, 55 oxide, 55 Carat, 290, 303 Carbon dioxide, 17 Cassiteros, 2 Cast-brass, 105, 108 Cast-gate, 187 Cast-iron, 32, 352 and tin, 364 Casting, 145 Centrifugal force, 277 Charcoal powder, 305, 318 Chaudet, 261, 267, 326 Chemical change, 13 combination, 70 compounds, 9-11 principles, 9 Chevillot, 318 Chili, 286 Chilling, 246 Chimney, 129 Chinese bronze, 224 tam-tams, 185 Chlorine, 19, 56 Choubly, 363 Christophle, 212, 228 Chrome-iron, 359 iron-stone, 32 Chrome-steel, 360 Chromium, 7, 32 Chrysorin, 111 Cinnabar, 25 Clarke, 298, 348 Clark's patent alloy, 338 Coating for moulds, 139 bloom, 34 glance, 34 Cohesion, 4 Coin, American, 329 Coins, 330 Cold-short, 29 Colour pot, 314 Coloured gold, 294, 300 solders, 311, 312 Colouring gold, 312 Combustion, 13 Common salt, 54, 66, 317 Composition, 296 Condensation of fume, 136 Cooper's gold, 348 mirror metal, 348 pén metal, 348 Cope, 187 and antimony, 23, 79 phosphorus, 23, 78 |