 |
 |
|
 |
|
 |
53 (LIII) — 1942-1943
H.P. of Motor, 261.
H.P. of Steam Engine, 67.
Haulage Methods, 155.
Haulage, Direct, 180.
Heat, 66.
Heat, Mechanical Equivalent, 67.
Heatings, Detection of, 258.
Hydraulic Coalburster, 240.
Hydraulic Packing, 204.
Hydraulic Pumping, 55.
Hydrogen Sulphide, 112.
Hydrox Shell, 227.
Hygrometer, 189.
Contains public sector information licensed under the 
