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55 (LV) — 1944-1945
A.C. Circuits, 143.
Acceleration and Retardation, 4.
Accidents in Mines, 20, 29, 40, 77, 93, 100, 121, 152, 170, 199, 233, 297.
Aeroto Mine Fan, 277.
Air Compression, 195, 206, 222, 234, 246, 259.
Air Measurement and Analysis, 249.
Air Provision for Engines, 108.
Air Velocity, Measurement, 197.
Air, Quantity and Pressure, 25, 57.
Air, Quantity Descending Shaft, 94.
Air, Receivers, 134.
Air, Speed of, 57.
Air-crossing, Construction, 33.
Air-currents, Distribution of, 220.
Airways, 208.
Algebra, 256, 268, 279, 290, 304.
Alternating Current, 79, 207.
Ameriean Mining Machinery, 259.
Analysis of Coal Sample, 9.
Angular Velocity, 13.
Answers to Correspondents, 12, 43, 62, 80, 86, 100, 103, 113, 127, 138, 151, 164, 185, 197, 204, 208, 221, 230, 271, 283, 296.
Anthracite Mine Fires, Controlling, 41.
Arched Supports in Main Level Road, 202.
Area of Enclosure, 110.
Area of Rectangle, 154.
Area of Triangle by Trigonometry, 66, 119.
Areas, 49.
Arithmetic, 130.
Armature Core, 103.
Armature Windings, 115.
Ascertaining Percentage of Oxygen, 237.
Atmosphere, Composition of, 91.
Atmospheric and Mine Air, 138.
Atmospheric Moisture, 15.
Atmospheric Pressure, Variations in, 201.
Averages, 243.
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