1. History of the résonance in horology: From Antide Janvier’s double pendulum to the 3 Abraham-Louis Breguet watch & clocks
A bit of history
In 1662, Christian Huygens, Dutch scientist, invents the pendulum. He observes that two pendulum clocks placed next to each other on the same wall, the oscillation of one influenced the other and vice versa.
But we do not know any object with 2 pendulums that would have existed before Antide Janvier developed his own construction at around 1780.
At this time, it wasn’t called resonance because it is a term invented by François-Paul Journe but it was called double pendulum.
One of Janvier’s experimentation was that 2 pendulums beat in natural opposition, each driven individually, was canceling all external impacts of external vibrations on the pendulum. It thus increased the precision.
Abraham-Louis Breguet made two clocks and one pocket watch using Janvier’s innovation, with double pendulum and double escapement. 2 are exhibited at the Jerusalem Museum, and one was recently auctioned at Christies a few years ago.