Horizontal base for holding one or more measuring instruments. There are holes for inserting the three extensible legs inv. 2538. There is also a large central opening in which two wooden circular sectors are fitted. Between them runs a cursor carrying a hook for a plumb line. The ornamentation suggests the item formed part of a box of mining instruments. Brought to Florence from Germany by Prince Mattias de' Medici in the first half of the seventeenth century.