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42 (XLII) — 1931-1932
Darby, H. C., 315.
Day Classes, Plea, 230.
Density of Air, 35.
Deputies and Safe Mining, 389.
Deputies, Notice to, 123.
Deputies, Safety Talks, 2, 18, 34, 54, 70, 87, 97, 123, 131, 146, 166, 184.
Deputies, State-paid, 211, 373.
Derbyshire Miners, 199.
Detaching Hook, 189.
Detectors, Gas, 26.
Detectors, Mice and Canaries, 4.
Developments, 131, 151, 193, 277, 315, 352, 409.
Dexterity, Vocational Tests, 371.
Dip Problem, 110.
Direct Current Motors, 319.
Docketed, Development Schemes, 393.
Draper Washer, 258.
Drums, Winding, 396.
Dry Separation of Slack, 139.
Dust Clouds, Electrification, 33.
Dust Collecting Plant, 153.
Dynamometer Instruments, 82.
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