The charm of the Regina (Queen) Margherita is connected to its grandeur and history. It was used in the silk factory Gavazzi in Desio (Milan) to power 1800 electrically operated looms and illuminate the premises. It was inaugurated in the presence of the royal family and tells the story of a time when Italian industries were gradually turning to electrical power. Its steam engine was built by the Franco Tosi workshops in Legnano, famous in the history of mechanical industry. A technical world animated by love such as that between the Museum founder Guido Ucelli and his wife Carla Tosi.