An escapement is a mechanism that converts rotary motion into oscillating motion.
- MacDowall single-pin escapement
- by BenVanDeWaal, who has several others
- gravity-powered and pendulum-regulated. "Based on James Arnfield's 1987 escapement, this Lego realisation separates the transfer of energy between the going train and the gravity arm from the following stage, the transfer of energy from the gravity arm to the pendulum."
- pendulum-powered pinwheel escapement. Lots of good notes.