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60 (LX) — 1949-1950
L. and C. Miners' Permanent Relief Society, 285.
Lamps, Illuminating Power of, 215, 275.
Lancashire Boiler, 115.
Leclanche Cell, 153.
Levelling Definitions, 38.
Levelling, Surveying and, 4, 18, 26, 38, 51, 63, 76, 90, 97.
Lighting Systems for New Mine, 55.
Limits of Inflammability, 71.
Lining Shafts with Concrete, 41, 280.
Liquids, Expansion of, 206.
Lockers and Brakes, 28.
Locomotive Track, Underground, 156.
Lost Seam, Recovery of, 311.
Lungovox Apparatus, 8.
Lynemouth Colliery Washery, 31.
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