Explanatory notes
… hour wheel. (5) Escapement (anchor or lever, pin pallet, cylinder, detent, etc.) : escape wheel and pinions, lever, pallet staff, rollers, pallet stones, impulse pin, cylinder. (6) Regulating device : balance, balance staff, hairspring (flat, Bréguet, cylindrical), tuning‑fork, stud, collet, regulator, index …