11. This type of clock was widely used as a master clock in large buildings to control numerous slave clocks . 12. Slave clocks rely upon electrical impulses from the master clock to mechanically move the clock hands one unit of time.13. Once the gravity arm is released, it trips a mechanism to reset itself ready for release by the slave clock . 14. The slave clock mechanism is not a conventional clock mechanism as it consists only of a ratchet wheel and time train. 15. If the slave clock has lost too much time, its blade spring pushes against the arm and this accelerates the pendulum. 16. Slave clock synchronization is usually achieved by phase-locking the slave clock signal to a signal received from the master clock.17. Slave clock synchronization is usually achieved by phase-locking the slave clock signal to a signal received from the master clock. 18. Experience in telegraphy led to connecting remote clocks ( slave clocks ) via wires to a controlling ( master clock ) clock. 19. The accuracy of the master-slave system was dictated by the accuracy of the master clock and reliability of the slave clocks . 20. A second approach to synchronized time transmitted along wires was to connect a master clock to relatively simple secondary clocks ( slave clocks ).
