Mechanically operating pendulum clock with an electronic correcting device

A mechanically operating pendulum clock, provided with an electronic correcting device comprising:

• a quartz oscillator;
• an electronic frequency divider which generates a frequency equal to that of the pendulum from the oscillation frequency of the quartz oscillator;
• a permanent magnet arranged on the pendulum;
• a control coil forming an electro-mechanical converter with an electro-magnet, the control coil being energizable at least in the two turning positions of the pendulum;
• a contact-free pendulum sensor;
• and,
• a proportional electronic control device having a converter which produces rectangular signals from the signals emitted by the quartz oscillator and the sensor, and a comparator which is adapted, depending upon the reciprocal phase position of the quartz oscillator and sensor signals, to transmit delay or acceleration signals and opposing acceleration or delay signals to the control coil, the opposing signals being phase-shifted by 180.degree., whereby the correcting device is effective at least in the two turning positions of the pendulum.