In the year 1846 Kelvin became professor of Natural Philosophy at The University of Glasgow.
Here, in 1847, meets Joule. This event was very interesting an Kelvin began to study the heat and his conversion in mechanical work.
Joule had the opinion that the Carnot idea on the heat preservation was wrong.
In 1851 Kelvin published the article "On the Dynamical Theory of Heat" that advanced the hypothesis that the theory of Carnot was not contray to the work of Joule.

Fathers of thermodynamics:

S.Carnot

James P. Joule

R. Clausius

L. Boltzman