HARVEY STEEL PROCESS. Named after the inventor, H. A. Harvey, an American metallurgist, this is a process of hardening the surface of steel, used in the production of armour plate. The essence of the process is that the plate is face-hardened by cementation of its surface. The plate is exposed in a furnace to great heat for a considerable period, about a fortnight, and covered with finely pulverized carbon. The surface of the steel is thus penetrated and carburized to a considerable depth, the front of the plate becoming of a different composition from that of the back. After thus being exposed to cementation, the plate is withdrawn and cooled slowly to a dull red, when it is suddenly chilled by a water spray. (See IRON AND STEEL ; ARMOUR PLATES; METALLURGY.)