Description

EARLY FRENCH SECTOR, c. second half 17th century, the substantial brass rule opening on its three-leaf sector hinge to 13-3/8″ (34 cm) overall. The hinge is finely engraved with a six-lobed rose on each side, and the near corners of the sector likewise have fine leaf decoration. There are few scales — only two doubled sector scales per side — as often the case with the earliest sectors. Exquisitely labeled and with hand-punched numerals, we find “Lignes des Partis Esgalles, Les Plans, Lignes des Cordes, Les Sollides.” In fine condition, noting a few stains and with a fine old patina, this is a rare example of early French mathematical instrument.