[HORLOGERIE], BREGUET, Brevet du Tourbillon et de l'Echappement à force constant

Extracts from the patents published in the encyclopedia "Description of machines and processes specified in the patents of invention" (1844) of the two main patents of invention of Abraham Breguet.
The tourbillon regulator and the constant-force escapement are the two most complex horological complications ever invented and still in use today in luxury watchmaking.