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

The best governing equations for the steady state and cooling in a cyl indrical aluminium bar have been determined with precision. As a first stage, a single exponential law was not found to be a good approximat ion for a direct calculation of the surface conductance coefficient, c ontrary to what had previously been found for iron. A more general the ory to explain the dependence of the surface conductance coefficient o n 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 conductor s.