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Grafometro
Graphometer

17th cent.
Brass; diameter 16,7 cm, height 12,5 cm
Florence, Istituto e Museo di Storia della Scienza, inv. 151

Made after the "graphomètre" invented in 1597 by Philippe Danfrie, this instrument was used for measuring the position of faraway landmarks in respect to Magnetic North or the dominant wind.