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56 (LVI) — 1945-1946
Packing, 59, 60, 92, 215.
Parallelogram, 123.
Partial Extraction, 6.
Pennsylvania Anthracite in 1944, 100.
Pipe Range, Diameter of, 70.
Plotting Traverse, 134.
Pneumonokoniosis: Partial Size Analysis of Airborne Dust, 78.
Pole, Vertical, Length of, 142.
Polygons, Area of, 78, 87.
Portable Electric Safety-lamp, 224.
Precise Surface Levelling, 188.
Primitive Conveyors, 73.
Prize Competition, 9, 21, 33, 47, 69, 81, 93, 105, 117, 128, 142, 153, 164, 178, 190, 201, 213, 225, 238, 249, 261, 274, 286, 298, 310.
Prize Competition Awards, 305.
Problems, Surveying, 2, 13, 25, 44, 54, 64, 78, 87, 104, 114, 122, 134, 146, 162, 176, 188, 195, 210, 222, 229, 242, 254, 265, 277, 294.
Prospects for Boys, 268.
Pulsometer Turbine Pump, 288.
Pumps for Acid, 273.
Pythagoras, Rule of, 157.
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