Curb
An iron casing, in which to ram moulds that are made in loam. They may be whole or in sections, according to size and convenience, and are of great service when the moulds are shallow and it is not desirable to sink a pit. They may be employed in the pit also, in order to limit the amount of sand to be rammed round a mould to the smallest amount possible consistent with safety. By this means much time and labor is saved. Those in common use are simply boiler plate, riveted together if whole, and bolted if in sections. Improved sections are made that lock together with steel pins, so that it becomes the simplest matter possible to alter the diameter to an unlimited extent. The most convenient depth for curbs is from 15 to 18 inches. See PIT; LOAM-MOULDING; RAMMING.