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![]() Quadrant This type of quadrant could be used for mathematical calculations, especially for determining the values of sines and cosines. The type of work, the accuracy of the engraving and the precision with which the lines are marked lead one to think of the German instrument makers of the Renaissance, and suggest, in particular, the hand of Christoph Schissler. The instruments belonged to the collection brought from Germany by Prince Mattias de' Medici in 1635. |