Wilbert Smith Archives Files Box 1131 19 1131-19-p067

Document Text (OCR)

5) The main piece is very similar in appearance to the residues produced in foundries when, after a mould has been filled, the excess metal remaining in the ladle is dumped into a hollow in a bed of sand, so that it will not solidify inside the ladle. This treatment is commonly known as "pigging". The rough bottom and edges of the piece are similar to surfaces produced by molten metal penetrating sand. In addition, it is common to put a piece of pipe or rod in the hole before the metal is...