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55 (LV) — 1944-1945
Packing Waste by Compressed Air, 287.
Percentages, 219.
Perfect Gas, Equation of, 195.
Permeability, 14.
Photo-electric Cell, 47.
Pillar and Stall, 241.
Pipe Joints, Tests for Air Leakage, 312.
Pit Shaft, Diameter, 310.
Pitting and Grooving, 262.
Plan of Districts, 225.
Ponies in Mines, 233.
Power in D.C. and A.C. Circuits, 188, 196.
Power in Three-Phase Circuits, 259.
Power, Measurement of, 188.
Power, Transmission of, 22.
Preparation of Stone Dust, 300.
Pressure on Submerged Surface, 62.
Prize Competition, 10, 21, 32, 44, 57, 69, 81, 94, 106, 118, 130, 140, 153, 165, 177, 189, 201, 212, 225, 236, 249, 261, 273, 285, 298.
Prize Competition Awards, 307.
Prizes for Mineworkers, 140.
Problems, Surveying, 49, 66, 74, 88, 98, 110, 125, 139, 147, 157, 172, 182, 198, 210, 217, 231, 245, 254, 267, 283, 291, 308.
Production of Coal, 229.
Proto Breathing Apparatus, 250.
Pulley Block, Principle of, 213.
Pump, Double-acting, 286.
Pump, Three-stage Turbine, 12.
Pumps, Lift and Force, 90.
Pumps, Merits, Centrifugal and Reciprocating, 11.
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