Glass forming apparatus and method

A method of forming glass sheets, the method comprising:

• flowing molten core glass from a molten core glass reservoir extending along a length of a glass sheet forming apparatus over a weir on at least a first side of the molten core glass reservoir;
• flowing molten clad glass down from a source of molten clad glass;
• wherein the weir comprises an inclined surface that, in the intended direction of molten glass flow, slopes linearly downward in the vertical direction while extending away from the molten core glass reservoir in the horizontal direction;
• wherein, along at least one cross section of the weir, a horizontal distance (A) between the closest and farthest points of the inclined surface from the molten core glass reservoir is greater than half a horizontal distance (B) between the molten core glass reservoir and the farthest point of the inclined surface from the molten glass reservoir;
• wherein the source of molten clad glass is configured above the glass forming apparatus such that when molten clad glass is flowing down from the source of molten clad glass and the molten core glass is flowing over the weir, the molten clad glass drops onto the molten core glass at a highest upstream contact point, said highest upstream contact point being located directly above the inclined surface of the weir;
• and
• wherein the molten core glass and the molten clad glass flowing over the weir form a molten glass sheet below a root located at a distance below the weir.