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42 (XLII) — 1931-1932

Early Steam Engines, 264.

Edwards, Ebenezer, 275.

Efficiency Factors, 101.

Efficiency, Steam Plant, 96.

Electric Cable Insulation, 388.

Electric Lamps, 13.

Electric Lamps, Lighting Standard, 84.

Electric Lighting, 202.

Electric Signalling, 56.

Electrical Engineering, 62, 158, 224, 287, 303.

Electrical Examination Questions, 312.

Electrical Frequency Change, 227.

Electrical Instruments, 22, 66.

Electrical Shot-firing Apparatus, 274, 344, 361, 379, 401.

Electrical Terms, 285.

Electrical Transformers, 80, 386, 402.

Electrically Driven Conveyors, 248.

Electricians and Safety, 405.

Electricity, 12, 331.

Electricity and Fires, 190.

Electricity v. Coal, 124.

Electricity v. Compressed Air, 93.

Electricity, Dangers, 30.

Electrification in Dust Clouds, 33.

Elevators, 59, 75.

Elled Seam, 107.

Empire's Mineral Position, 322.

Endless Rope, 127, 326.

Estate, Coal Under, 368.

Etna Dry Separator, 220.

Examination (Electrical) Thoughts, 296.

Examination Notes, Surveyors, 36, 279.

Examination Questions, 20, 218, 229.

Examination Results, 27, 236.

Examinations, Notes on, 162, 179, 378.

Explosion Flames, 100.

Explosion, Speed, 124.

Explosions in Mines, 170, 303.

Explosives in Mines, 11, 149, 197, 232, 352.

Explosives, Firedamp Ignition by, 53, 67.

Explosives, High and Low, 78.

Explosives, Substitutes, 44.

Explosives, Testing, 356.

Explosives, Use of, 67, 73, 356, 392, 408.

Exports, 27, 172, 316, 364, 409.