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47 (XLVII) — 1936-1937
Obituary, 166, 180.
Officials' Bull's Eye Lamp, 362.
Ohm's Law, 328.
Oil from Coa1, 151, 199, 211, 229.
Old Workings, Approaching, 383.
Old Workings, Sinking through, 94.
Organisation, Importance of, 148.
Organisation, Research, 169.
Origin of Managers' Associations, 328.
Outbursts, Gaseous, 335.
Output and Exports, 9, 32, 41, 66, 69, 88, 100, 117, 131, 151, 163, 184, 213, 235, 245, 267, 280, 281, 292, 313, 325, 344, 360, 380, 392.
Output, Falling, Report on, 304.
Over-rope Haulage Runaways, 357.
Overwinding Precautions, 212.
Oxy-acetylene Welding, 104.
Oxygen, Deficiency, 362.
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