Law governing the Connexion between the Number of Particles and their Diameters in grinding Crushed Sand

THE discovery of a simple law relating to continuity of particle size in fine grinding (or the breaking up larger into smaller particles) has long been a matter of scientific and technical importance. By means of experiments extending over some years, the British Portland Cement Research Association has definitely ascertained that, so far as a crystalline substance such as “standard sand” is concerned, a definite law does undoubtedly exist, which may be defined mathematically as follows