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James Kynvyn, Strumento nautico
James Kynvyn, Nautical instrument

London 1597
Brass; diameter 31 cm
Florence, Istituto e Museo di Storia della Scienza, inv. 3174

Instrument comprising a round plate divided into four quadrants, two with the sine grid for trigonometric calculus, one with the shadow square for measuring distances, and one with a quadrant for determining longitude. Provenance: Robert Dudley bequest.