Rayleigh–Lorentz pendulum
Rayleigh–Lorentz pendulum (or Lorentz pendulum) is a simple pendulum, but subjected to a slowly varying frequency due to an external action (frequency is varied by varying the pendulum length), named after Lord Rayleigh and Hendrik Lorentz. This problem formed the basis for the concept of adiabatic invariants in mechanics.
Source: Wikipedia — Rayleigh–Lorentz pendulum (CC BY-SA 4.0)