Graphometer or semicircle, with compass, with transversal vernier and double degree division and with ball and socket joint. The mainscale reads from 0 – 180 degrees on the outer edge and 180-0 on the inner edge. Pair of sights on the alidade with vernier on both sides. The frame is decorated with floral decorations. The compass rose with steel needle is divided in four quadrants of 90 degrees. The north direction of the compass is decorated with a fleur-de-lis.

Made by Michael Butterfield (c.1635 – 1735). Butterfield was an English instrument maker who had his workshop in the Faubourg St. Germain in Paris from before 1665 to 1724. His signature is engraved on the fixed limb.

In his time Butterfield was considered as one of the best designer of nautical and observation instruments. He was friends with Huygens. Peter the Great visited his workshop in 1717.

Catalogue: NM.6-34

Date: 1665 – 1724

HWL instrument: 10.5×23.5×16 cm

Signed: Butterfield AParis

Origin: France

Condition: perfect, original patin