James Clerk Maxwell constructs a plaster thermodynamic…

James Clerk Maxwell constructs a plaster thermodynamic visualization as a way of exploring phase transitions in 1874, based on the American scientist Josiah Willard Gibbs's graphical thermodynamics papers.

In 1871, Maxwell had established Maxwell's thermodynamic relations, which are statements of equality among the second derivatives of the thermodynamic potentials with respect to different thermodynamic variables.