In a steam heating system, a return pipe which carries both water of condensation and air.

A porcelain enameling process in which the metal article is heated to a temperature above the maturing temperature of the

Brick formed in molds under high pressures from relatively dry clay (5 to 7% moisture content).

A mechanical press for forming brick, cast stone, or other ceramic articles from slightly moistened granular mixtures; pressure is applied

One that discharges a fine, dry powder (usually sodium bicarbonate, potassium bicarbonate, or ammonium phosphate) by the pressure of a

The control valve for a drypipe sprinkler system which activates the system; must be in a location where it is