Museo Galileo
Virtual Museum
Instrument of the "Primum Mobile"
    • Setting:
      Room I
    • Inventor:
      Peter Apianus
    • Maker:
      Egnazio Danti
    • Place:
    • Date:
    • Materials:
    • Dimensions:
      height 279 mm
    • Inventory:
    • Instrument of the "Primum Mobile" (Inv. 2643)

The Instrument of the Primum Mobile is also called the quadrant of Petrus Apianus, because he invented it and described it in the treatise Instrumentum primi mobilis (Nuremberg, 1524). The instrument is used to find sines and cosines. It bears the initials "F.E.D.P.F." [Frater Egnatius Dantis Predicatorum Fecit]. Egnazio Danti dedicated it to Grand Duke Cosimo I de' Medici, as attested by the Medici coat of arms engraved on the front. The instrument was depicted on the ceiling of the Stanzino delle Matematiche in the Uffizi Gallery. Provenance: Medici collections.