Blanket crepe, properties of, 324 Blemishes of surface, 252 Blister in sheet, 272 Block rubber, 129, 246 Breaking down of rubber, 304 -- load of test piece, 311 Bubbles in sheet, 269 Buildings, 159 Bulking latex, 69 Byrne curing process, 270 Calendered sheet, 304 Carbon dioxide, 289 Carbonic acid gas, 289 Cases, choice of, for packing, 153 Catalysts, natural, in rubber, 312 --, vulcanising, 312 Centralisation of factories, 221 Chinese vinegar, 286 Chinosol, 238 "Chula" drier, 148 Clippings, sheet, 275 Coagulant, 111 --, choice of, 74, 278 --, quantity of, 113 Coagulation, 74, 111 -- centres, 62 --, premature, 46 --, spontaneous, 294 -- with alcohol, 289 -- -- sugars, 287 -- -- various salts, 288 Coagulum, soft, 249 --, spongy undersurface of, 249 --, tearing of, 249 --, transport of, 59, 63 --, working of, 103 Coefficient of vulcanisation, 319 Collecting latex, 38 -- pails, 48 Collection, advantages of early, 60 Combustion, rate of, in smoke house, 191 Compound crepes, 126 -- -- No. 1, 151 -- -- No. 2, 151 Contents of cases, weight of, 156 Copper salts, cause of tackiness, 243 Cotton fibre in crepe, 230 Creosotic substances, 146 Crepe, air-drying of, 132 --, bark in, 232 --, bearing of defects in, on manufacture, 316 --, bisulphite streaks in, 235 --, colour of fine, 114 --, dirt in, 227 --, dirty edges of, 225 --, drying houses for, 178 --, fibre in, 230 --, general style of finish, 223 --, grades of, 150 --, greenish, tacky streaks in, 228 --, iron stains on, 225 Crepe, No. 1 fine pale, 110 --, oil marks on, 226 --, oxidation streaks in, 234 --, rate of air-drying of, 138 --, rust stains on, 226 --, smoked, 130 --, surface moulds on, 241 --, weight increased in drying house, 141 --, yellow latex streaks in, 234 -- rubber, defects in, 223 -- --, lower grades of, 120 -- --, preparation of, 110 -- --, tensile strength of, 313 Cups, cleaning, 40 --, water in, 44 Cure, rate of, 318 Curing, 307 Da Costa process, 290 Decentralisation of factories, 221 Defects of sheet, infrequent, 276 Derry process, 293 Designs and "layout" of tanks, 176 Dirt in sheet, 276 Discoloration of rubber, dark, 249 Drains for tanks, 176 Drier, Colombo Commercial Company's, 136 Driers, artificial--for crepe rubber, 133 -- --, for sheet rubber, 148 --, "Chula," 148 --, vacuum, 134 Drum furnaces, horizontal, 189 Drying chamber, floor of, 187 -- --, arrangements of, 186 -- houses for crepe, 178 -- --, hot air, 182 -- --, ventilation of, 185 -- --, windows of, 185 -- of rubber, 132 --, period of, 145 --, rate of, effect on rate of cure, 323 Earth scrap, 124 -- --, collection of, 58 Edges, thickened, after rolling, 251 Elongation of test piece, 311 Ends, thickened, after rolling, 251