Title: Graphometer or semicircle
Object type: Graphometer or semicircle
Date: late 17th–early 18th century
Artist:  Michael Butterfield 
Artist bio: ca. 1635–1724, worked 1678
Artist role: Maker
Medium: Brass
Dimensions: Overall: 7 1/8 × 10 7/8 × 5 1/4 in. (18.1 × 27.6 × 13.3 cm)
Classification: Metalwork-Brass
Credit line: Gift of Mrs. Stephen D. Tucker, 1903
Department: European Sculpture and Decorative Arts
Repository: Metropolitan Museum of Art, New York, NY
Tags: term: Fish