Graphometer or semicircle late 17th–early 18th century Michael Butterfield. Graphometer or semicircle 188838 Maker: Michael Butterfield, ca. 1635?1724, worked 1678, Graphometer or semicircle, late 17th?early 18th century, Brass, Overall: 7 1/8 ? 10 7/8 ? 5 1/4 in. ( ? ? cm). The Metropolitan Museum of Art, New York. Gift of Mrs. Stephen D. Tucker, 1903 ()

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