164, 174; brushes, _172_; compound, 174; continuous-current, 165; multipolar, 169; series wound, _173_; shunt wound, _173_; shunt wound, _173_; simple, 161, _162_. Ear, the, _271_, _273_; a good, 274, 307; sensitiveness of, 275. Eccentric, _52_, 53; setting of, 53. Sliders, 297. Sound, nature of, 112; static, 114.