1. Apparatus for the manufacture from a molten thermoplastics material, such as glass, by mechanical drawing of continuous filaments of various cross-sections, comprising especially a glass supply source connected to a die heated by the Joule effect, gas blowing means directed towards the bottom of the die and drawing means for said filaments, characterised in that the bottom of the said die has a lower surface which includes a multiplicity of fibre-forming centres divided into at least two different categories, each centre being formed by a zone perforated by a group of orifices having a structure which differs from one category to the other, the structure of the said zones being such that it is possible to draw, simultaneously and in a stable manner, a single filament from each centre of at least one category and a filament from each orifice belonging to the centres of at least one other category.
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