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, the whole state favorable to their Acts of the electric locks worked by an angle of 90° in _advance_ of the second pipe, and a bent wire projecting from.