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Jean Joseph Léon Farcot (23 June 1824 – 19 March 1908) was a French engineer and industrialist whose factories employed up to 700 workers. He was also a prolific inventor. He was one of the pioneers of the servomechanism, where a feedback loop helps control a machine. The invention lets one helmsman control a ship's rudder weighing several tons.
In 1846 Marie-Joseph Farcot transferred his factory close to the docks and railway station in Saint-Ouen on the Seine. Through successive purchases of land the works grew to almost . The main output of the factory was steam engines, but it also produced boilers, pumps and electrical machines. Joseph Farcot help build the workshops in Saint-Ouen. In 1848 he became head of the research section of the Maison Farcot. The factory employed 145 workers in 1849, and 500–700 between 1872 and 1902.
In 1867 the Maison Farcot received the Grand Prix pour mérite hors ligne at the International Exposition of 1867 in Paris. Almost all the machines they exhibited were designed by Joseph Farcot. They exhibited two coupled horizontal steam engines at the exhibition each of which delivered 80 horsepower. They won a gold medal for their horizontal steam engines in the class of motors, generators and mechanical devices. The report of the jury noted that the Farcots had installed two 100 horsepower which took water from the Seine at the quai d'Austerlitz in Paris and delivered it along a line of to the reservoirs at Ménilmontant, higher up.
Joseph Farcot was made a knight of the Legion of Honour in 1867, and officer in 1878. In 1879 he became president of the Society of Civil Engineers of France. Joseph Farcot died in Saint-Ouen, Seine-Saint-Denis, on 19 March 1908. He was aged eighty three. After his death the factory in Saint-Ouen ran into difficulties. It was sold in 1915, and in 1924 was acquired by André Citroën.
Marie-Joseph Farcot designed a governor in 1854, and he and Joseph designed several others after this, including the crossed-arm governor, which achieved close to isochronous operation, although it was prone to instability. The Farcots refined the design with friction brakes, and in 1864 added an air dashpot. They obtained a patent for a spring-loaded governor in 1864. Farcot's automatic variable expansion-gear, an attachment to a Corliss steam engine, was exhibited at the Exposition Universelle of 1878 in Paris. The mechanism supported a wide range of automatic cut-offs between 0 and 80% of the stroke, with a relatively simple and elegant design.
Farcot was given a British patent for a steering engine in 1868. In 1873 he published a book Le servo-moteur ou moteur asservi that described the different steam steering devices that Farcot and Son had developed. Farcot noted that with the steering engine of the Bélier coastal defense ship, a force of by the helmsman could operate a rudder with loads of .
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