soldering together of edges of iron, copper, brass, &c., with an alloy composed of brass and zinc, and sometimes with the addition of a little tin or silver. The surfaces being filed perfectly bright, and cleansed, the alloy in a nearly pulverulent form is to be wetted with borax made into a paste with water; after which it is suffered to dry, and is then carefully exposed to bright ignition in a clear fire. (Ure's Dict. of Arts and Manufactures.)