  The Astrarium made by Jacopo Dondi dell'Orologio in Padua in 1344 is one of
the first public horologia in the World, their public utility is also shown
through the history of the tower bell of Our Lady of Suffragio in Turin, made
by the mathematician Francesco Fa\`a di Bruno in 1866. The tower bell of St.
Anthony in Lanciano made by Antonio Cibotti was inaugurated by the Pope Paul VI
in 1973 through a radio impulse, and now many tower bells are radio
synchronized to the Central European Time within a single second of accuracy.
