Bed-board
A board on which to ram the nowal part when the bed is formed by the method of rolling-over (see ROLLING-OVER). It may be of iron, wood, or plaster, with dimensions corresponding to outer edges of the flask used. Besides presenting a surface which accurately matches the upper side of the pattern, to prevent any possibility of the pattern being rammed out of shape, it must be made strong enough to lift the body of sand contained, when bed-board, nowal, and bottom-board are secured together for rolling-over; as any deflection will irretrievably destroy what would otherwise have been a correct impress of the pattern. See FOLLOW-BOARD; TURNOVER-BOARD; BOTTOM-BOARD.