Marc Seguin (20 April 1786 – 24 February 1875) was a French engineer, inventor of the wire-cable suspension bridge and the multi-tubular steam-engine boiler.
Early life
Seguin was born in Annonay, Ardèche to Marc François Seguin (1757–1832), the founder of Seguin & Co., and Thérèse-Augustine de Montgolfier (1764–1843), a niece of the pioneer hot air balloonist Joseph Montgolfier.
Career
Bridges
left|thumb|Marc Seguin suspension bridge near Annonay, 1825
Seguin was an inventor and entrepreneur who developed the first suspension bridge in continental Europe. He built and administered 186 toll-bridges throughout France.
At the 1823 Exposition des produits de l'industrie française a model was exhibited of a planned suspension bridge which would span the Rhône from Tain-l'Hermitage to Tournon-sur-Rhône. The bridge, designed by Seguin, was completed in 1825.
Steam locomotives
thumb|right|Replica of 1829 locomotive Marc Seguin at the Champs Elysées Expo Train Capitale, Paris, 2003.
Shortly after the Stockton and Darlington Railway in England opened (1825) he visited it and observed George Stephenson's Locomotion in operation and acquired two of his engines, which however proved unreliable in French conditions. In 1829, he delivered two steam locomotives of his own design to the Saint-Étienne–Lyon railway. These used an innovative multi-tube boiler and also prominent mechanically-driven fans to provide draught on the fire, rather than Stephenson's blastpipe. This boiler resembled the later Scotch marine boiler in some aspects, in that the boiler had a large single flue from the furnace, then many small-diameter fire-tubes returning to a chimney above the firebox door. Uniquely, Seguin's design also arranged the furnace in a large square water-jacketed firebox beneath the boiler to provide a large grate area and greater heating capacity. Robert Stephenson had also made the same decision with his Rocket, but placed his firebox separately and behind the main boiler shell.