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60 (LX) — 1949-1950
Radiation, 229.
Ram Pumps, 117.
Reciprocal Levelling, 227.
Rectangular Co-ordinates, 172, 204.
Reopening Sealed Workings, 55.
Reorganisation of Coal Mining Industry, 7.
Rescue Work, Improvement of, 115.
Resection in Surveying, 193, 209.
Resistance of Mines, 288, 294, 303.
Resultant Force, 130, 131, 132.
Ringrose Firedamp Detector, 100, 167, 242.
Rock, Excavation and Removal in Shaft Sinking, 139, 146, 164.
Roof Control, 7, 54.
Roof Fall, Clearing, 61.
Roof Pressure, 178.
Roof Ripping, 274.
Roof Supports, 129, 179.
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