Abstract
The author's investigation was to cover the permeability, heat conductivity and other properties of the foundry sand, of which the present study concerned the permeability. It was presumed in the investigation that the sand layer consists of an aggregates of capillaries and each capillary is of the same diameter. (1) The diameter, (2) the length and the distributive density of the capillary were taken as the inner-structure constants of the sand layer. The author dealt with the method of determining the three constants and measured experimentally the inner-structure constants relating to each of sand layers discriminated by passing through a sieve and the binary layer of their systematic mixtures. Besides, the author measured the acral permeability through each of the sand layers. comparatively studied on its relation to the inner-structure constant and referred to the permeability of an aggregate of the "perfect globules."
