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50 (L) — 1939-1940
Lamp Construction and Candle-power, 148.
Lamp -Station Underground, 382.
Lancashire Boilers, 77, 93.
Lancashire Coal President, 149.
Leakage, Air, 42.
Level, Dumpy, 95.
Levelling, 312, 328, 342, 374.
Lighting Picking Belts, 247.
Lighting Restrictions, War-time, 90.
Lighting, Mine, 35, 163, 239, 364.
Limits of Inflammability, 101.
Lining, Shaft, 351.
Load Capacity, Winding Ropes, 196.
Lowering Men by Trams, 367.
Lubrication, Tub, 277.
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