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41 (XLI) — 1930-1931

Earth Movements, 13.

Earthing, 362.

Economiser, Green's, 15.

Edlington Pithead Baths, 107.

Education, Lord Percy on, 76.

Education, Mining, 88, 89, 99, 103, 124, 195, 226, 247, 306, 315, 347, 401.

Eighteenth Century Mine, 291.

Eisteddfod Prize Winner, 55.

Electric Bell, 381.

Electrical Apparatus, Flameproof, 4, 312, 379.

Electrical Circuits, 52, 74.

Electrical Coaling, 76.

Electrical Dangers, Mining, 346, 394.

Electrical Generators, 180, 195.

Electrical Instruments, 239.

Electrical Plant Materials, 46.

Electrical Power Transmission, 130, 150.

Electrical Problems, 168, 336.

Electrical Researches, 41.

Electrical Signalling, 408.

Electrical Terms, 192, 382.

Electrical Tests, 122.

Electricians at Cardiff, 377, 394.

Electricity in Mines, 203, 215.

Electricity v. Compressed Air, 20.

Electricity, Increasing Use, 375.

Electricity, Use of, 20.

Empire Mineral Resources, 249, 268.

Endless-rope Haulage, 106, 114.

Engine Cylinder Dimensions, 342.

Engineering and Other Problems, 170, 187.

Engineering Exhibit, 151.

Engineers, Dearth of, 163.

Equipment, Coal Mine, 165, 194.

Estate, Weight of Coal, 350.

European Coal Output, 91.

Examination Questions, 8, 23, 216, 230, 316, 404.

Examination Results, 33, 245.

Examinations, Notes on, 73, 84, 296.

Examinations, Surveyors', Notes, 38, 263.

Exploring Underground, 367.

Explosions in Mines, 40, 41, 44, 69, 132, 183, 247.

Explosives in Mines, 69, 301.

Explosives Report, 364.

Explosives Sub-committee, 43.

Explosives, Use and Abuse, 132, 200.

Exports, Coal, 12, 33, 219, 345.