Epact Scientific Instruments of Medieval and Renaissance Europe

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Quadrant
Attributed to Giovanni Battista Giusti
Dated 1556; Italian
Ebony; 167 mm in radius

This quadrant, dedicated to Cosimo de' Medici who was to become Grand Duke of Tuscany only a few years later, bears the calendar and the date 1556 on one face. On the other face is the horary quadrant, calibrated for the latitude of 43? 45' corresponding to Florence. A small head in bas-relief is attached to the centre.

Although the instrument is unsigned, it is attributed to Giovanni Battista Giusti or to the Medicean workshop which produced the measuring instruments for the Grand Ducal collection.

Istituto e Museo di Storia della Scienza, Firenze
Inventory no. 2521

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