What famous invention was patented by Abraham-Louis Breguet in 1801?

Abraham-Louis Breguet, a prominent watchmaker, is credited with significant advancements in horological technology during the late 18th and early 19th centuries. The tourbillon, patented by Breguet in 1801, is one of his most important inventions. This mechanism was designed to improve the accuracy of mechanical watches by counteracting the effects of gravity on the movement's escapement. In a standard watch, variations in position can affect timekeeping; by placing the escapement in a rotating cage, the tourbillon averages out these positional errors, theoretically enhancing the precision of the watch.

Breguet's contribution of the tourbillon has been fundamental in horology, showcasing his innovative spirit and dedication to improving watchmaking technology. His invention is still celebrated today, not only for its technical achievement but also for its aesthetic appeal, often seen in high-end timepieces. This gives the tourbillon a prestigious status within the watchmaking community.