FACT OF THE DAY

Why one 1750 invention still runs your watch today

The lever escapement, invented by Thomas Mudge around 1750, has held its place at the heart of mechanical watches for roughly two centuries, thanks to two clever traits: it is detached, and it is self-starting. Detached means the lever only touches the balance wheel for a brief moment, delivering a small push before letting the balance swing freely on its own — that light, occasional contact is what makes the escapement so accurate.

Self-starting is the quiet hero for everyday wear: if a knock stops the balance, a lever watch can pick itself back up and resume ticking without a shake or a wind. As the overview on Wikipedia notes, this practicality helped the design become the standard in most mechanical watches by the 19th century. Next time your watch survives a bump on the desk, thank a clockmaker from 1750.

Tick on.