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59 (LIX) — 1948-1949
Pillars, Splitting, 279.
Pithead Frames, 266.
Pitot Tube, 252.
Plotting Bearings and Lengths, 30.
Plotting Survey, 18, 35.
Power Factor, 71.
Power Transmission, 48.
Primary and Secondary Cells, 90, 105, 110.
Prize Competition, 9, 21, 33, 46, 57, 69, 81, 93, 106, 118, 129, 140, 152, 165, 177, 188, 201, 213, 225, 237, 249, 261, 273, 285, 297, 309.
Prize Competition Awards, 303.
Problems, Surveying, 1, 18, 30, 34, 35, 38, 47, 51, 64, 70, 80, 91, 98, 114, 126, 130, 136, 146, 160, 168, 172, 182, 194, 206, 219, 234, 241, 258, 265, 278, 286, 289, 302.
Protecting Coal Pillar, 127.
Proto Mark IV. S.C. Breathing Apparatus, 308.
Pyrometer, 262.
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