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51 (LI) — 1940-1941
Pack Building, 92.
Paper 52, Fuel Research, 195.
Pennsylvania Mining Methods, 129.
Pennsylvania Water Problem, 309.
Pick Sharpening, 29.
Pillar Working, 157.
Pillars, Size of, 128.
Pit Guards, 179.
Pit Timber, 224.
Pit-atmosphere, Getting, 66.
Pitot Tube, 137.
Plant Conditions, Coal for, 263.
Plant, Electric, 385.
Platelayers' Calculations, 375.
Points to Remember, 2.
Polar and Rectangular Co-ordinates, 360.
Power and Combustion, 233.
Power and Lighting Specification, 250.
Power Cables in Mines, 57.
Power, Coal and Use of, 149.
Preparation, Coal, for Market, 279, 401.
Preservation of Mine Timber, 107.
Pressure, Steam, Table, 219.
Prize Competition, 13, 28, 44, 61, 76, 92, 108, 124, 140, 156, 172, 188, 204, 220, 236, 251, 268, 283, 299, 316, 331, 348, 362, 379, 396.
Problems, Readers', 4.
Production, Coal, 12.
Properties of Firedamp, 94.
Protective Equipment, Reasons for, 49, 185, 197, 226, 273, 310, 362, 391.
Proving Faults, 237.
Pulverised Coal Firing, 64.
Pump, Single-acting, 168.
Pumping, 148.
Pumping, Power for, 63.
Pumps, Ram, 238, 408.
Pumps, Simple, 331.
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