Mechanical clock movements with a running time of approx. 7 days per winding. Suitable for pendulum wall clocks.
Their common features:
- Cable- (with weights) and/or spring-driven
- Made in Southern Germany
In mechanical clock movements, the length of the pendulum is determined by the movement's gear ratios. Therefore, the indicated pendulum length cannot arbitrarily be altered.
This measurement indicates the vibration of the pendulum measured at the circumference of its bob. In order to provide sufficient clearance for the pendulum bob, the inside width of a clock case should be approx. 2 cm greater than the pendulum's swing.
Automatic Beat Adjustment Most SELVA cable-driven movements have an automatic beat adjustment. This feature makes it possible to set the beat of the movement by simply pushing the pendulum beyond its normal arc of vibration. Once the pendulum's vibrations return to normal, the beat of the movement will be perfectly even.