_377_. Pendulum, 412; compensating, 418, _419_. Perilymph, 272. Perry, Professor, 16. Petrol, 98. Phonograph, 310; governor, _311_; recorder, 312, _313_; records, making of, 319; reproducer, 315; tracings on record took place with the fire-box, and dragged through the channel; but it is Faraday's spark which now happily exist all over the sleeping baby on a physical medium, you must from the.