Nicolas Mathieu Rieussec
Nicolas Mathieu Rieussec (July 20, 1781 – June 18, 1866) was a French watchmaker, who invented the Chronograph in 1822.
Clockmaker to the King of France
Clockmaker of the Royal Garde-Meuble
Timing of a horse race on the Champ de Mars in Paris.
March 9th - Following a favourable verdict from the Royal Academy of Science, the consultative committee for Arts and Engineering of the Ministry of the Interior granted Rieussec a five-year patent for a "timepiece or counter of distance covered" which its inventor named a "seconds chronograph". Rieussec's device, which was accurate to one-fifth of a second, deposited a drop of ink, on demand, onto a rotating dial to mark the start and finish of an elapsed time.
Fatton, in association with Breguet, proposed an improved version of this inking chronograph in 1823.
A ten-year patent entitled "improvements to chronographs" was awarded as a simplified version of the 1822 patent.