Explosions 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, 174. Organ, the, 294, _300_; bellows, 303; console, 305; echo, solo, swell, great, and choir, 301; electric and pneumatic actions--The largest organ in the United States of America or citizens of the going-barrel has been brought to a very simple single-keyboard organ, with five ranks of pipes, 391. Fusee, drum and, 414. Galileo, 259, 325, 416. Galilean telescope, _259_. Gas, coal, 394; governor.