Abstract: A method of controlling the position of liquid metal in a mould cavity comprising the steps of feeding molten metal to the mould cavity, sensing the position of a surface of the metal in the cavity by a managing means responsive to electrical capacitance between sadi surface and a signal plate disposed externally of the liquid metal and adjacent to said surface, controlling the rate at which the molten metal is fed into the cavity in accordance with a control signal produced by said managing means so as to achieve a predetermined filling regime (as herein defined) governed by the position of said surface in the cavity.