A method for the production of reinforced hollow sections with a continuous periphery. A theoretical induction efficiency which the cylinder would have if it operated with an optimal inductionexhaust timing value is estimated; said theoretical induction efficiency is derated by a correction factor depending on the inductionexhaust timing value actually used to estimate the induction efficiency, which is a standardised measurement of the filling of the cylinder. The filtering means is disposed generally toward the closed end of the vessel. At least one outer lead is joined to one of the metallic terminals through a bonding layer. A first videoconferencing unit of the first location acts as a multipoint control unit of the videoconference.