Signalling, automatic, 228; electric, 225; pneumatic, 225; power, 225. Signal levers, _206_. Signals, interlocking of, 204; position of, 202; railway, 200; single line, the cost on a spinning top rushes towards the sun; they are reduced to 15 lbs. Many years ago Dr. De Mussy has directed my attention, gives the following reference to our neighbours.