Diving-bell, 332 ; simple, 333 , 334 . Diving-dress, 335. Direction of current in dynamo circuit, 163. Diver's feats, 338; helmet, 336 ; lamp, 338 . Donkey-engines, 68. Doorstop, self-closing, 344. Double-cylinder engines, 47. Draught, forced, 28, 29 ; induced, 29. Drum and fusee, 414 . Durability of motor-car engine, 96. D-valve, 67. Dynamo, alternating, 164, 174; brushes, 172 ; compound, 174; continuous-current, 165; multipolar, 169; series wound, 173 ; shunt wound, 173 ; simple, 161, 162 . Ear, the, 271 , 273 ; a good, 274, 307; sensitiveness of, 275.
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