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![]() Polyhedral Dial There are various individual dials on the instrument, marked with hour lines and provided with gnomons. A compass is inserted in the base to allow the instrument to be oriented towards North. The instrument is calibrated for a latitude of 43? 30', corresponding to Pisa, and is dated and signed by Girolamo della Volpaia, the son of Camillo, and a member of the family of instrument makers, beginning with Lorenzo, who worked for the Medici court. |