| Drills-continued. Eclipse, 187, 188 for boring by hand, 157 Ingersoll-Sergeant, 193 sharpening, 158, 182 steel for, 182 tunnels in soft ground, 263 with reserve of rope, 392 Dry compressors, 166 for China clay, 592 or changing house, 679 Drying of minerals, 592 Dubois and François air-compressor, Fencing Act, Quarry, 667 Fernow on the trees available for Festiniog, boot worn by rockman, method of working slate at, 312 jumper used at, 157 tribute system at, 649, 651 Filling up, working with complete, Fire-clay, 26 weathering of, 611 Fire-damp found in ore mines, 476 Fireless locomotives, 363 Fires, accidents from underground, in sulphur mines, Sicily, 321 Fire-setting, 225 Firing by electricity, 220 explosives, 218 Firth's pick machine, 199 Flat-rope, winding with the, 393 mining at Brandon, Suffolk, 41 Flints, shaping of, 629 Floating reef in Kimberley dia- Flooded workings, breaking into, 707 Florida, phosphates of, 69 Fluted rolls, 556 Galena, dressing of, 624, 625 ozokerite mines of, 63 Galloway on the fire-damp cap, 499 double walling stage, 409 Garfield Mine, California, 79 Garnier, discovery of nickel ore in Gas for underground lighting, 522 of nitro-compounds, 212 Gates crusher, 560 Gätzschmann, on animals as indica- tors, 105 Gearing pump-buckets, 448 Geikie, Sir A., definition of a mineral Gelatine dynamite, 214 Geology as a guide to minerals, 97 Germany, amber dredging, 304 Gerolstein, borings for carbonic acid gas at, 25 Giant granite, 58 mines, 290 powder, 214 Gillott and Copley's machine, 203 Githens system of boring, 162 Gobert's modification of Poetsch's freezing process, 283 Gold, amalgamation of, 616 associated minerals, 97 in gozzan, 100 modes of occurrence, 41 Run Ditch and Mining Co., 302 Good conduct, premiums for, 652 Gouge, definition of, II Gozzan, 99 at the Anaconda mine, 37 at Rio Tinto, 33 influence of, on value of ore, 101 Guinotte, pumping-engines with fly- Gun for clearing bore-holes, 160 products of decomposition, 212, Gunpowder, 209 charging holes with, 217 products of explosion of, 210 Gympie gold-field, lodes of, 13 calcination of, 611, 613 |