Abstract: An improvement in the process for the production of a glass ribbon by the float glass method, wherein the glass ribbon is formed on a bath of molten metal, caused to float along on top of it and, after being sufficiently hardened, drawn off the bath. The improvement includes the step of pneumatically or mechanically generating and maintaining transverse and longitudinal currents in the molten metal in order to distribute the temperature evenly and/or to stretch the layer of glass on the metal bath. In construction, the currents are generated by a pump which is submerged in the molten metal. The pump includes pneumatic or mechanical structure for pumping molten metal through it so as to create the desired currents.