. . . . . . "Gibbs' thermodynamic surface" . . . . . "3D surface figure" . "plaster thermodynamic visualisation" . . . . . . . "clay model illustrating Gibbs's construct" . . "Maxwell's thermodynamic surface" . . "Thermodynamic surface" . . . "thermodynamic surface" . . . . . . "Maxwell's thermodynamic surface" . . "1874" .