ready to receive the time-signals. The electrical working of the apparatus which accomplishes this will be understood by reference to Fig. 8.^[1] Under normal conditions, the current from the observatory passes

directly through the chronopher, and out at the galvanometer G', to the tower-clock at the Houses of Parliament, "Westminster. This clock has a gravity escapement, and a metallic compensating pendulum, very similar to the pendulum of the Sidereal Standard, already described, and runs with a rate of less than one second per week. The