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60 (LX) — 1949-1950

Safety in Mines Research Annual Report, 7.

Safety-lamps, Lighting Efficiency, 100.

Science, Mining, 114, 121, 136, 147, 157, 174, 183, 198, 206, 222, 245, 277, 290, 305.

Sealed Areas, Atmosphere in, 124.

Sectional Levelling, 19.

Sector of Circle, Area, 112.

Semi-Rotary Pump, 65.

Separation Door, 285.

Shaft Plug, 194.

Shaft Sinking, 2, 17, 29, 41, 49, 66, 78, 92, 96, 101, 123, 139, 145, 164, 169, 182, 195, 212, 221, 232, 241, 253, 265, 280, 291, 308.

Shaft, Heading and Fault, Plan and Section of, 38.

Shot-firing, 94, 212.

Sighting Lines, Suspending, 202.

Sinking and Lining Circular Shaft, 96.

Sinking and Walling Simultaneously, 195.

Sinking Pumps, 241.

Siphon, 116, 147.

Solids, Volume of, 151.

Sources of Ignition, 32.

Specific Gravity of Coal, 70.

Specific Gravity of Rock, 45, 250.

Specific Heat, 183, 198.

Speed and Velocity, 50.

Speed Control, Ward-Leonard System, 239.

Spiralarm Type M Firedamp Detector, 201, 242.

Spirit Levelling, 225.

Spontaneous Heating, 146, 158, 299.

Spur Gearing, 171.

St. Helens Mining Society, 216.

Stalls, Driving, 143.

Stalls, Width of, 116.

Steam Engine Governor, 97.

Steam Slide Valve, 262.

Steam, Condensation of, 215.

Steam, Heat in, 214.

Steel Supports, Drawing off, 22.

Storrow Apparatus, 260.

Subsidence and Support, 279, 289, 302.

Subsidence, Control of, 180.

Subsidence, Limitation of, 275, 290, 309.

Successful Competitor, 32.

Sulphuretted Hydrogen, 245.

Support of Pipes in Shafts, 66.

Survey, Plotting a, 301.

Surveying and Levelling, 4, 18, 26, 38, 51, 63, 76, 90, 97.

Suspended Tubbing, 109.