TOWARDS A THEORY OF THE SURFACE CONDUCTANCE COEFFICIENT IN SOLIDS .1.

The best governing equations for the steady state and cooling in a cylindrical aluminium bar have been determined with precision. As a first stage, a single exponential law was not found to be a good approximation for a direct calculation of the surface conductance coefficient, contrary to what had previously been found for iron. A more general theory to explain the dependence of the surface conductance coefficient on time position, and temperature could be based, in principle, on the use of the hypergeometric series. It would probably need a great deal of experimental data from several solids, both good and poor conductors.