LIST OF FIGURES. 



PAGE. 



Fig. 156 The Tetter Petroleum Engine and Pump 248 



Fig. 157 The Aldrich Electric Pump 249 



Fig. 158 The McEwen Engine , 250 



Fig. 159 Wallarah Switchboard 251 



Fig. 160 The Geipel Rapidity Steam Trap 252 



Fig. 161 Babcock and Wilcox Boiler 253 



Fig. 162 Babcock and Wilcox Feed-water Heater 254 



Fig. 163 The "Sentinel" Feed-water Feeder and Oil Separator 255 



Fig. 164 Portable Electric Drill 256 



Fig. 165 Dragbar 259 



Fig. 166 Goodman Coal Cutter on Trolly, ready for Flitting ... 260 



Pig. 167 Boring a Shot Hole 261 



Fig. 168 Section of Upper Seam, Rhondda Colliery 262 



Pig. 169 Mouth of Intake Heading, Rhondda 263 



Fig. 170 Skips proceeding to Screens, Rhondda 265 



Fig. 171 Sectional Arrangements of Stirling Boiler 266 



Fig. 172 Jeffrey Electric Chain Breast Machine 2(57 



Fig. 173 Goodman Electric Chain Breast Machine 268 



Fig. 174 Irregularity of Surface due to Caving-in of Ground 



between Pillars 270 



Fig. 175 Goose Neck Hook 272 



Fig. 176 Clip 272 



Pig. 177 Pillar Extraction, with fairly good Roof 273 



Pig. 178. Pillar Extraction, with a bad Roof 274 



Fig. 179 Water Barrel and Pump 276 



Fig. 180 Coal Boxes 277 



Fiu. 181 Norwalk Compound Straight Line Compressor 279 



Fig. 182 Travelling Crane 281 



Fig. 183 Headframe and Heapstead 282 



Fig. 184 Long Wall System 284 



Fig. 185 Stayner's Nut 285 



Fig. 186 Skip Detacher 286 



Fig. 187 Hopper Skip 287 



Pig. 188 Pillar Drawing 290 



Fig. 189 Walker's Safety Hook 293 



Fig. 190 Frame used when Sinking Shaft Lining 294 



Fig. 191 Method of Forcing-down Cylinders 296 



Fig. 192 Trepan, Side Elevation ... 297 



Fig. 193 Trepan, Plan 297 



Fig. 194 Rock Drill 300 



Fig. 195 Avery Turntable Weighing Machine 303 



Pig. 196 Connection for Bridle Chain 306 



Fig. 197 Tate's Water Balance Tippler 307 



Fig. 198 Headgear of Downcast Shaft, Lambton B. Colliery ... 309 



Fig. 199 Ormerod's Safety Hook ... 310 



Pig. 200 Upcast Shaft and Waddle Fan 313 



Fig. 201 Lamp Cabin 314 



Fiir. 202 Jeffrey Conveyor 315 



Fig. 203 Trough and Scraper 318 



Fig. 204 "Alabama" Type Steel Roller Chain 318 



Fig. 205 Pithead Frame and Fan 319 



Fig. 206 Pillar Work ... 328 



Fiu-. 207 Jig Cage 329 



Fig. 208. Double-deck Tunnel Cage 332 



Fig. 209 Unloading Top Deck of Cage 333 



Fig. 210 Pithead Frame, Heddon Greta 335 



Fig. 211 Furnace and Stack at Air Tunnel 336 



XII. 



