An aberration correcting element includes a first electrode layer including a plurality of electrode portions; a second electrode layer opposed to the first electrode layer; and a liquid crystal sandwiched between the first and second electrode layers for producing a phase change corresponding to voltages applied to the first and second electrode layers in a light beam passing therethrough. Said head has plurality of through-all hole for bristle insertion. Each shuttles comprises at least one circuit for at least one conditioning fluid for controlling the temperature of the article located in the die, the moulding apparatus comprising at least one feed system for at least one conditioning fluid to feed the conditioning fluid to the shuttles inserted in the seats of the moulding apparatus. Each of the sandwiching sections has a fuel gas channel and an oxygen-containing gas channel.