Duisburg was a German town in Duchy of Cleve-J?lich-Berg-Mark, between the rivers Rhine and Ruhr. It appears in the history of practical mathematics because Gerard Mercator moved there from Louvain, as Cosmographer to the Duke of Cleve, after he had been imprisoned on charges of heresy in his home town of Rupelmonde in Flanders. Other scholars from the Netherlands moved to Duisburg in this period in search of greater religious tolerance.

For Duisburg instruments, see:
   Astrolabe, Attributed to Gerard Mercator, Duisburg, circa 1570 (Firenze, IMSS)

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