Transient conduction# Lumped bodies, the semi-infinite solid, and the plane wall, cylinder and sphere. Biot’s heated bar and the Biot number (1804) Biot's heated bar and the Biot number (1804) Kelvin’s age of the Earth (1862) Kelvin's age of the Earth (1862) Heisler’s transient conduction charts (1947) Heisler's transient conduction charts (1947)