Epact Scientific Instruments of Medieval and Renaissance Europe

The back has the less common image of the brazen serpent which Moses was told to present to the Israelites dying from snake bites in the desert. This is often understood today as a symbol of the physician, since the Israelites were healed by looking at the serpent, but it was probably included on the dial to make a theological point: the Christian is healed spiritually by looking in faith at the sacrifice of Christ on the cross.

Museum of the History of Science, Oxford
Inventory number 37133

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