Marc Seguin nsIn existographies, Marc Seguin (1786-1875) (CR:5) was French engineer noted for having made some of the first statements on the conservation of energy and on correlations between heat and work.

In 1822, Seguin, in his letter “Observations on the Effects of Heat and Motion”, expressed views on the conservation of vis viva. [2]

In 1829, George Stephenson built is “Rocket” locomotive, that had a multi-tubular boiler, made of 25 copper tubes; it is conjectured that either Stephenson learned this from Seguin, or Seguin learned this from Stephenson. [4]

In 1839, owing to his studies of the steam engine, Seguin concluded that heat and work were interconvertable and was said to have estimated the mechanical equivalent of heat. [3]

Quotes | On
The following are quotes on Seguin:

Kirchhoff’s predecessors in the field of radiation bore him much the same relation as, in the conservation of energy, Mayer, Colding, and Seguin bore to Joule and Thomson.”
Hermann Helmholtz (c.1863), Publication [1]

1. Tait, Peter G. (1868). Sketch of Thermodynamics (pg. vi). Edmonston and Douglas.
2. Seguin, Marc. (1822). “Observations on the Effects of Heat and Motion”, letter to John Herschel, 12 Sep; Published in Edin. Phil. J. 10 (1824): 280-83; See D. S. L. Cardwell, James Joule: A Biography (Manchester: University of Manchester Press, 1989), pg. 61.
3. (a) Marc Seguin – Britannica, 1911.
(b) Purrington, Robert D. (1997). Physics in the Nineteenth Century (Marc Seguin, pgs. 104, 107-08). Rutgers University Press.
4. Kirby, Richard. (1956). Engineering in History (co-authors: Sidney Withington, Arthur Darling, Frederick Kilgour) (pg. 278). Courier, 1990.

External links
‚óŹ Marc Seguin – Wikipedia.

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