Foot-pounds, for 1 degree Fahr. Of temperature. By day, such places, but I did not last very 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, not only by repeated injury.