Abstract: The reel comprises a core and two identical end plates fitted in and assembled on the core. It is characterized in that each one-piece end plate (2) has a cylindrical support (6) on its inside face, which support fits into the core (1), and a reserve housing (20) in its outside face, which housing communicates with the periphery of the core, and in that the core has an inside bevelled surface (5) of limited angle (b) on each of its ends Application: packaging optical fibers or electrical conductors.

Abstract: The invention relates to a high-frequency furnace whose wall is formed by superposed wall-forming members. This furnace includes in particular an inner tubular wall comprising a zirconia tube (38), an alumina washer (39) laid on the zirconia tube and a silica tube (40) laid on the washer. There is a large groove (41) in a top plate (37) to accommodate the silica tube (40). The furnace also includes an outer tube (36) of silica. This structure makes it possible to accommodate differential expansion of the zirconia and the silica in two separate steps. The axial difference is accommodated at the groove (41) while the radial difference is accomodated at the washer (39). Leakage of inert gas pumped into the chamber during operation can then be maintained within acceptable limits throughout the temperature range. Application to the production of optical fibers.