Reflections on the Motive Power of Fire
Reflections on the Motive Power of Fire and on Machines Fitted to Develop that Power (French: Réflexions sur la puissance motrice du feu et sur les machines propres à développer cette puissance) is a scientific treatise written by the French military engineer Sadi Carnot. Published in 1824 in French, the short book (118 pages in the original) sought to advance a rational theory of heat engines.
Source: Wikipedia — Reflections on the Motive Power of Fire (CC BY-SA 4.0)