Masters of Chronometry continues with resonance, one of the most elusive ideas in precision watchmaking.

In Episode 2, Wei Koh and Constant Kwong trace the story from Christiaan Huygens’ observation of two pendulum clocks in 1665, to Antide Janvier’s resonance clocks, Abraham-Louis Breguet’s pocket watches and François-Paul Journe’s Chronomètre à Résonance.

Using the record-setting F.P. Journe Chronomètre à Résonance “Souscription, No. 007” as the starting point, the episode asks why this watch carries such historical weight. The answer is not only its rarity or auction result, but the courage required to bring true resonance to the wristwatch, where two independent oscillators enter the same frequency through shared vibrational energy.

Wei and Constant also compare Journe’s approach with other modern resonance watches, looking at the distinction between pure resonance and systems that use more direct forms of mechanical coupling.