Very smooth and regular.
Driven by clockwork.
A mechanism powered by a coiled spring and regulated by some form of escapement; the power is transmitted through toothed gearwheels and used to drive a mechanical clock, toy, or other device.
The action of behaving mechanically in the manner of a clock.
Non-transient.
Turned back toward the base.
Running back toward its origin.
Recurring; happening time after time.