Pierre-Louis Berthoud
French horologist
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Pierre-Louis Berthoud (1754–1813) was a celebrated French chronometer maker and the nephew of Ferdinand Berthoud, a renowned horologist. Horology is the science of measuring time and the art of making time-indicating instruments. Pierre-Louis Berthoud succeeded Abraham-Louis Breguet as the official chronometer maker to the French navy in 1815. His work contributed to the development of marine clocks, which were crucial for determining longitude at sea.123
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