 |
 |
|
 |
|
 |
50 (L) — 1939-1940
Tars, Hydrogenation-Cracking, 140.
Temporary Props, 113.
Thermal Precipitator, 185.
Timber Preservation, 30, 157.
Timber Saving, 260.
Timber Stored Underground, 155.
Timbering in Anthracite Mines, 83.
Timbering, Purpose of, 5, 41.
Timbering, Systematic, 77, 113.
Toadstones, 240.
Training Boys, 5, 236.
Training Staffs, 131.
Trams, Colliery, 57.
Transformers, 132, 200.
Tromp Bath, 194.
Tub Couplings, 281.
Tub Rerailer, 303.
Tubbing, Shaft, 362.
Tunnels Connecting Seams, 262.
Tunnels in Faulted Measures, 294.
Turbine Pump, 323.
Contains public sector information licensed under the 
