In the ceiling of the hall there is the most interesting part of the installation. From the top to the bottom can be seen the high precision clamp for the suspension of the wire, the set of vacuum reed magnetic contacts for the generation of the driving pulses for the electromagnet, the safety disk against wire breaking, the Charron ring with its centring system. Owing to the practical difficulty of installing electrical cables all over the hall, the driving pulses are transmitted by coded radio waves to the electronics on the floor. The box of radio transmitter is seen on the bottom left. All the system is powered by a solar panel which restores the charge of a storage battery. ...continues