(1) Blocks of cast iron set into the underside of a cap frame to bear on a DEAD-CURB. (Lincolnshire). (2) Lumps of CAST IRON which have solidified, into grooves in the sand floor in front of the smelting furnace. The grooves are normally arranges in the form of a main channel from which branched numerous side channels for the pigs. The main channel produced the SOW.