What year was Nicolas Léonard Sadi Carnot's 118-page French book published? 
Nicolas Léonard Sadi Carnot:  In his only publication, the 1824 monograph "Reflections on the Motive Power of Fire", Carnot gave the first successful theory of the maximum efficiency of heat engines. Carnot's work attracted little attention during his lifetime, but it was later used by Rudolf Clausius and Lord Kelvin to formalize the second law of thermodynamics and define the concept of entropy. Reflections on the Motive Power of Fire:  The 118-page book's French title was "Réflexions sur la puissance motrice du feu et sur les machines propres à développer cette puissance".
1824