Petrol, 98. Phonograph, 310; governor, 311 ; recorder, 312, 313 ; records, making of, 319; reproducer, 315; tracings on record of, 317 . Pianoforte, 277; sounding-board, 280; striking mechanism, 281; strings, 281. Piccolo, 308. Pipes, closed, 289; flue, 301; open, 292; organ, 295; reed, 301, 302 ; tuning, 302. Piston valve, 67. Pneumatic tyres, 341. Poldhu, signalling station at, 138. Points, railway, 208, 210 ; and signals in combination, 211. Poles of a magnet, 115. Popoff, Professor A., 138, 145. Power, transmission of, 175.
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