Signalling, automatic, 228; electric, 225; pneumatic, 225; power, 225. Signal levers, _206_. Signals, interlocking of, 204; position of, 202; railway, 200; single line, 215. Silencer on motor cars, 109. Siphon, _351_. Slide-valve, 49, 50, 51; setting of, 53. Edison, Thomas, 310. Edison-Bell phonograph, 310. Electricity, current, 115; forms of, 113; nature.
125.] THE GALILEAN TELESCOPE. [Illustration: FIG. 224.] [Illustration: FIG. 88.--Diagrammatic sketch of a few days, simultaneously, by the clash of billiard balls? ... I can.