Shutter
The cast or wrought iron plate which, when suitably prepared with a loam daubing on both its sides, is set before the flow-hole inside the dam for the purpose of regulating the stream issuing from thence. A lever is usually employed to control it. Smaller shutters are employed to check or turn the stream of metal issuing from the furnace to a mould direct. When the metal is allowed to collect in a large sand-basin before entering the mould, the shutter controls the stream. See DAMS.