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49 (XLIX) — 1938-1939
Hailwood Lamp, 253.
Hard Hats Softened Blows, 43.
Hard Headings, Dust in, 309.
Harris, Henry C., 182.
Haulage Accidents, 46, 88.
Haulage and Travelling, 211, 225.
Haulage Investigations, 99.
Haulage Problem, 288, 413.
Haulage Signalling, 191.
Haulage Types, 317.
Haulage, Endless Rope, 303.
Haulage, Main and Auxiliary, 165.
Heat, Loss of, 194, 224.
Hempel's Apparatus, 50.
High Explosives, 168.
High Explosives, Firing, 178.
Holiday Camp, First, 378.
Holidays, 25, 315.
Horse Haulage Operations, 381.
Horses, Colliery, 196.
Hours of Work, 371, 409.
Human Factor, 249, 401.
Humidity, Physics of, 307.
Hydraulic Coalburster, 357.
Hydraulics, 34, 56, 68, 104.
Hydrogen Cyanide Vapour, 24.
Hydrogen Sulphide, 82.
Hydrogenation Cracking of Tars, 87.
Hygrometer, etc., 80, 365.
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