The Measurers:
a Flemish Image of Mathematics in the Sixteenth Century

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Figure 39
The nautical square, quadratum nauticum.



From Gemma Frisius, De astrolabo catholico (Antwerp, 1556) (catalogue no. 3).

This feature is included on the astrolabes in the exhibition by Arsenius and by Gemini: see catalogue no. 40 and catalogue no. 42.

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