21 March – 21 June 2016 in Florence, Rome, Naples, Palermo, Padua


Charles Frodsham, London, second quarter 19 th C.

The main quadrant of the half second clock indicates hours and minutes, whereas the little one shows the seconds. For their great handiness, these clocks were used for work out of the observatories.

INAF-Osservatorio Astronomico di Capodimonte, Museo, inv. 1883