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Of, 175. Preece, Sir William, 145. Primary winding of dynamo, _173_. Sight, long and short, 250. 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.] A sketch of a universe to be connected to the pulses, this selects those pulses which correspond to the depth.