In what year did the Clausius of the Clausius-Mossotti relation die?
Clausius–Mossotti relation: The Clausius–Mossotti relation expresses the dielectric constant (relative permittivity) ε of a material in terms of the atomic polarizibility α of the material's constituent atoms and/or molecules, or a homogeneous mixture thereof. Clausius–Mossotti relation:  It is named after Ottaviano-Fabrizio Mossotti and Rudolf Clausius. Rudolf Clausius: Rudolf Julius Emanuel Clausius (2 January 1822 – 24 August 1888) was a German physicist and mathematician and is considered one of the central founders of the science of thermodynamics.
1888