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57 (LVII) — 1946-1947
Ranging Lines, 104.
Reciprocal Levelling, 266.
Reciprocating Air Compressor, 286.
Recording Barometric Pressure, 97.
Rectangular Co-ordinates, 27, 37.
Regulated Air Splitting, 279.
Regulator, 22, 199.
Relative Density, 68.
Relative Humidity, 126, 130.
Removing Firedamp, 298.
Removing Rock from Sinking Shaft, 240.
Rescue Apparatus, Use of, 295.
Rescue Work, 61, 86.
Resistance of Airways, 172.
Restricting Filling of Dirt, 295.
Reversal of Air-current, 39, 73, 119.
Reversed Faults, Distinguishing, 3.
Reversing Roadway Conveyors, 69.
Ringrose Automatic Firedamp Detector, 92.
Ripping, Supporting, 23.
Rock Faults or Washouts, 30.
Roof Control, 158.
Rope Drive, 72.
Routine Dial Surveys, 218.
Ruhr Coalfield, 8, 21.
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