The present invention relates to a process for manufacturing a glass comprising the production of a horizontal stream (F) of molten glass and the mixing of this stream, characterized in that said mixing is carried out by rotating n shafts (10, 20), n being an integer greater than or equal to two, each having an axis, two adjacent shafts (10, 20) being separated by a distance (D) with their axes parallel and with each of these two adjacent shafts (10, 20) connected to at least one rod (11, 12; 21, 22) which is located at least partly in said stream (F) and each of these rods (11, 12, 21, 22) having an axis parallel to the axis of the shaft to which it is connected, in that for said two adjacent shafts at least, the distance between the axis of one rod and the axis of the shaft to which it is connected is greater than or equal to 9/20 of the distance (D) between the axes of these two shafts, and in that said two adjacent shafts are rotated in opposite directions with respect to one another with, following the direction of the stream and by considering, seen from above, that one shaft is on the left and that the other is on the right, the left-hand shaft being rotated in the anticlockwise direction and the right-hand shaft being rotated in the clockwise direction.