A process for preserving timber and making it incombustible by impregnating it successively with solutions of iron sulfate and calcium chloride in vacuo.

A process by which copper matte is treated by passing through it a blast of air, to oxidize and remove sulphur. It is analogous in apparatus to the process of making Bessemer steel.

A process for hardening the face of steel, involving the additional carburizing of the face of a piece of low-carbon steel by heaping a solid carbon-rich fuel (such as charcoal) on the face of the steel and then subjecting this to very high heat at high pressure for a prolonged period of time, followed by a violent chilling, as by a spray of cold water. This results in a thick surface of extreme hardness supported by material gradually decreasing in hardness to the unaltered soft steel at the back.

(statistics) A series of independent trials, analogous to repeatedly flipping a coin to determine whether it is fair.

A process for washing pig iron, differing from the Bell process in using manganese as well as iron oxide, and performed in a Pernot furnace.

The process of removing moisture from the blast of an iron blast furnace by reducing its temperature so far that it will not remain suspended as vapour in the blast current, but will be deposited as snow in the cooling apparatus. The resultant uniformly dehydrated blast effects great economy in fuel consumption, and promotes regularity of furnace operation, and certainty of furnace control.

plural of process plate

(historical) A plate prepared by a mechanical process, especially a photomechanical process.

(photography, historical) A photographic process based on the action of light in rendering a thin layer of bitumen, with which the plate is coated, insoluble.

(engineering, mining) A method of sinking through water-bearing ground, in which the shaft is lined with tubbing and provided with an airlock, work being proceeded with under air pressure.