Explanatory notes
… Regulating device : balance, balance staff, hairspring (flat, Bréguet, cylindrical), tuning‑fork, stud, collet, … plate, great wheel, pin wheel, third wheel, warning wheel, fly, detents, levers or fly springs, repeater rack, snail, … indicating the hours, minutes and seconds. They may be flat or curved. They are usually of silvered, gilded, …