File:Museum Boerhaave - Snellius Quadrant.jpg
Museum Boerhaave, Leiden -
Quadrant was manfuctured to order by the cartographer Willem Janszoon Blaeu for the Leiden professor Willem Snel van Rooyen, better known as Snellius (1580 -1626)
Date
Source
Author
Prof. Jos van den Broek
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