Michael BUTTERFIELD (1635-1724) Brass octagonal pocket sundial engraved with Arabic and Roman numerals, with compass. Bird-shaped folding style. Back with 28 French and European city latitudes. Signed "Butterfield à Paris". Circa 1700. 6.5 x 6 cm. Scratches, wear and oxidation. In its black morocco case lined with green velvet. 6.5 x 7.5 cm. Wear and tear. Michael BUTTERFIELD (1635-1724), a British-born engineer and mathematician who settled in France as a manufacturer of mathematical and astronomical instruments, became one of the finest craftsmen of his time and gave his name to a pocket sundial. In 1678, his workshop was located in the Faubourg Saint-Germain, rue Neuve des fosse, and in 1697, on the Quai de l'horloge. and bore the sign "Aux armes d'Angleterre".