Resonance was studied in the context of watchmaking as early as the 17th century, when Christiaan Huygens (1629-1695), inventor of the pendulum clock, first discovered that two separate pendulum clocks, when hung from a common beam, synchronized, thanks to resonance (two oscillating bodies in close proximity influence each other and eventually synchronize). Abraham-Louis Breguet later also explored resonance and subsequently created a double pendulum resonance clock."
Article at Professional Watches
