Abstract: Structurally hermetic light construction concrete which may be reinforced and comprising water, cement and light weight admixtures of inorganic, foamed or bloated or blown aggregates compatible with concrete and approximately spherical or elipsoidal in shape and in proportions corresponding to the sieve characteristic, wherein the grain densities and strengths of the light weight admixtures increase continuously or in more than two steps with increasing grain diameter, while the grain absorptions simultaneously decrease continuously or in more than two steps.

Abstract: Apparatus and method for producing black powder granules of a given grain size by compressing black powder meal, subjecting the compressed black powder to coarse crushing and grinding the coarse crushed black powder in a cone mill.

Abstract: A structural member is interposed between the primary pellet and a charge, the structural member having upper and lower open-ended chambers formed by walls of the structural member which converge towards an opening generally centrally located within the structural member providing communication between the chambers. The upper chamber serves to convey the sparks emitted by the priming pellet to the charge disposed in the lower chamber.