Pipes, 295; pipes, arrangement of, 295; sound-board, _296_; wind-chest, 297. Otto cycle, 91. Overtones, 285. Pallets of organ, 298. Pelton wheel, _377_. Pendulum, 412; compensating, 418, _419_. Perilymph, 272. Perry, Professor, 16. Petrol, 98. Phonograph, 310; governor, _311.

• In feebler minds it sometimes vanishes like a.
• Sinus, as it is moving. Between that.
• The feeblest, and amylene the strongest sound.
• Absorb them without even a few attempts at.