Cheshire, 162

merits of, 169

North Staffordshire, 163

shape of stalls, 161

size of pillars, 158

South Wales, 181

strength of pillars, 156
width of stalls, 155

working of the pillars, 160
Pit-bottom arrangements, 361
Pit-frames, 419

height of, 420.

lattice girder, 420

plate girder, 420
wood, 420

Pneumatic sinking, 135
water-barrel, 434

Poetsch's sinking, 137
Points and crossings, 337
Porch, pit-bottom, 146
Power of winding-engines, 409
Pressure, ventilating, 205, 228
Props and bars, 321
Protector lock, 287

Pulley, cast-iron, 418
size of, 418

-, wrought-iron, 418
Pulsometer, 108
Pumps, 441

-, air-vessels, 458

-, arrangement in shaft, 447

bucket, 104, 450
cataract, 444
Davey, 450

lifting-screws, 105

fan-shaft covers, 212
fire-lamp, 200
furnace, 200
horse-power in air, 215
longwall colliery, 196
measurement of air, 215
mechanical, 211
-, natural, 198

overcasts, 195

-, pressure, 205, 207, 228
rules for, 222
sinking pit, 114
splitting, 250

stoppings, 193

temporary, 493
theory, 222

waterfall, 198

-, water-gauge, 205

weight of air, 204

wind-blower, 197

Villepigue perforator, 300

Water carts, 276
garlands, 100

gauge, 205
underground, 264
wheels, 389
winding, 433
winding-tank, 433

Waterfall, 197
Wax walls, 170
Wedging, 297

curb, 123
Weight of air, 203
West Riding Colliery, 269
West's safety-hook, 438
West Stanley Colliery, 271
Whitehaven Colliery, 271
Widening bore-holes, 75
Wind-blower, 197
Wind-bores, 105
Winding, 388

cages, 427
cage catches, 432
conductors, 429
landings, 431
-, pit-frames, 419
pulleys, 418
rope socket, 420
safety-cages, 439
safety-hooks, 436
shaft indicators, 406
signals, 408
steam-engines, 390
unloading cage, 433
water, 433
water-balance, 389
water-wheel, 389
windlass, 388
wire ropes, 423

Winding-engines, 390

Boulton and Watt, 391
brakes, 407

cam gear, 403

counterbalancing, 404

flat rope, 406

Harris's Navigation, 396

link motion, 400

Monkwearmouth, 392

parallel motion, 393

-, power of, 409

shaft indicators, 406

valves, 396, 407

weights, dimensions, etc., 397
rules for size, 501-504

Windlass, 388

Winning, 82

inclined seams, 82, 83

Winning, level seams, 82
metal veins, 85

-, steep seams, 84
Winstanley's coal-cutter, 315
Winzes, 181

Wire ropes, 423

transmission by, 384

Wolff's lamp, 288

grapnel, 72

Wooden tubbing, 130

Working barrel, 103

Workings, approaching old, 483
Worthington's sinking-pump, 108
double-acting pump, 452

YNISHIR Colliery, 277
Yoch coal-cutter, 317
Yorkshire longwall, 179

ZINC, 29

THE END.