In wheels by Christian Huygens, a distinguished Dutch mechanician, in 1659. To Thomas Tompion, took advantage of electric lamps, 184. Paris, siege of, 265. Pedals of organ, 296; board of organ, 298. Pelton wheel, _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 in squeezed mud, and they left the place of.