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60 (LX) — 1949-1950
Abandoned Mines, Plans of, 76, 170.
Acceleration, 62.
Accidents at Mines, 30, 67, 103, 144, 159, 184, 197, 248, 259, 284, 304.
Air Analysis, 167.
Air Compression, 286.
Air Measurement, 196, 210, 273.
Air Samples, Collection, 125.
Air Sampling Pipe, 112.
Air, Flow of, Factors affecting, 278.
Air, Purification of Exhaled, 24.
Air, Quantity of, 40, 73.
Air, Weight of, 130.
Air-crossing, 142.
Air-current, Regulation of, 303.
Air-current, Splitting, 6, 15, 294.
Air-lock, 15.
Airways, Forms of, 131, 210.
Airways, Resistance of, 143.
Anemometer, 196.
Angles, 112, 122.
Answers to Correspondents, 1, 5, 15, 27, 28, 51, 52, 63, 77, 91, 97, 99, 110, 135, 151, 182, 211, 218, 243, 269, 278, 295, 304, 309.
Archimedes, Principle of, 58.
Atmosphere, 114, 121, 136, 137.
Attwood's Machine, 74.
Auxiliary Fans, 25.
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