Clock/Foucault pendulum, Bravais pendulum (n° 21)
This combo has three distinct functions:
- To tell the time. This involves one metre of pendulum length, regulated to compensate for differences in length due to temperature variations.
- To indicate and measure the rotation of the earth by oscillating freely like any Foucault pendulum.
- Measure the speed of rotation of the earth if used as a conical pendulum.