column of air, 291. Note, fundamental, 285; quality of, 285. Niagara Falls, power station at, 174. Organ, the, 294, 300 ; bellows, 303; console, 305; echo, solo, swell, great, and choir, 301; electric and pneumatic, 305; largest in the world, 306; pedals, 298; pipes, 295; pipes, arrangement of, 295; sound-board, 296 ; wind-chest, 297. Otto cycle, 91. Overtones, 285. Pallets of organ, 297. Parallel arrangement of electric lamps, 184. Paris, siege of, 265. Pedals of organ, 298. Pelton wheel, 377 . Pendulum, 412; compensating, 418, 419 . Perilymph, 272. Perry, Professor, 16.
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