Open Access

Fig. 1


Download original image

Observatory of the Roman College seen from the Calandrelli Tower. The reproduction shows in order: 1) bundle of electric cables for the transmission of the signals of the meteorological sensors located on the Calandrelli Tower to the Secchi’s automatic Meteorograph; 2) pole with wicker ball, used, starting from 1847, to signal midday to the artillerymen of Castel S. Angelo; 3) dome with the Merz telescope; 4) elliptical observatory for the meridian circle of Ertel; 5) dome with the Cauchoix telescope; 6) electric turret observatory with the small ball conductor; 7) Median Terrace of the Calandrelli Tower. From Secchi’s communication L’astronomia in Roma nel Pontificato di Pio IX (Secchi, 1877).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.