Rolling-over
A term applied to the method of obtaining bottom or lower portions of mould by first ramming the pattern within the drag or nowel part, and then reversing the position of the flask, by means proportionate to its size and weight. Ordinarily the pattern is placed face down on the follow-board or match-plate, over which is set the nowel or drag. The pattern, being first covered with facing-sand, is then subjected to a process of ramming until the flask is filled with sand, when, if the flask be an open one, a board or plate is laid over and clamped firmly to the follow-board, but should there be cross-bars in the flask, the plate is dispensed with. After clamping, the whole is rolled over, and is ready for subsequent operations. See FOLLOW-BOARD; MATCH-PLATE.