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40 (XL) — 1929-1930

Earth Resistivity, Measurement, 267.

Earthquakes, British, 295.

Earth's Magnetic Field, 294.

Echo of Cassop Disaster, 359.

Economiser in Boiler, 272.

Education, Miners', 54, 88, 89, 103, 131, 169, 209, 233, 240, 263, 273, 293, 328.

Egyptian Iron Age, 337.

Electric Bell Tests, 401.

Electric Circuit, Simple, 114.

Electric Energy, 218.

Electric Lamp, 198.

Electric Winding Plant, 2, 18, 38, 52, 70, 84, 100, 116.

Electrical Equipment Inspection, 147.

Electrical Plant and Explosions, 335.

Electricity and Coal, 167.

Electricity in Mines, 75, 99, 149, 245.

Electricity v. Compressed Air, 260.

Electricity, Where Dangerous, 162.

Electro Magnetism, 312.

Electro-magnetic Action, 328.

Electro-magnetic Induction, 410.

Electro-magnets, Application, 376.

Elliot Washer, 364.

Ellistown, Derivation, 353.

Empire Mining Congress, 184, 243, 289, 308, 321, 323.

Employed Persons, 37.

Endless Rope, 287.

Energy, Units, 244.

Engine House Equipment, 415.

Enlarging Shafts, 78.

Equations, Simple, 290, 310.

Equivalent Orifice, 384.

Era of Competition, 344.

Evans Sinking Pump, 386.

Evans-Bevan, D. M., Wedding, 248.

Examination Notes, 55, 185, 202, 252, 378.

Examination Questions, 228, 246, 259, 408.

Examination Results, 24, 232.

Examinations Board, 33, 53, 119, 259.

Exhibitions, Value of, 161.

Explosion Theories, 382.

Explosion Waves, Photographing, 97.

Explosions Experiment, 380.

Explosions, Lessons, 162.

Explosions, Violence, 72.

Explosives Regulations, 220.

Explosives Statistics, 43.

Explosives Substitutes, 253.

Explosives, Firing, 73.

Explosives, Inspectors' Report, 9.

Explosives, Mining, 74, 104, 331, 363, 371, 391.

Exports Coal, 65, 163, 256.