Gas, coal, 394; governor, 402; meter, 405; traps, 374; works, 394. Gasometer, 397; largest, _398_, 399. Gauge, steam, 36, _38_; water, 35, _36_. Gear, compensating, 107, _108_. Compound engines, 59; arrangement of, 295; sound-board, _296_; wind-chest, 297. Otto cycle, 91. Overtones, 285. Pallets of organ, 297. Parallel arrangement of needle-instrument circuit. The shaded circle is the _primary, or low-tension, circuit_. A _high-tension_ current is sent through the front edge of the biographer final. So great a difficulty in getting to the pedals. SEPARATE SOUND-BOARDS. The keyboard.