the evolution of various types of crushers for stone and ore, and the characteristics of rocks as affecting abrasion in crushing machinery. W T W MILLER, SIR RAS REDMAYNE, P B BROWN, H F MARRIOTT, B H KNIGHT, AHD MARKWICK, E MORTON, G BADGER, SIR R HADFIELD, E K SCOTT, J S OWENS, B W HOLMAN, H C JENKINS, G J BROWN, R J SARJANT and