EARLY FRENCH SECTOR

EARLY FRENCH SECTOR

Stock Number: 9309

$2200.

For sale, 17th century antique brass sector finely engraved and labeled with hand punched numerals.
Typical of early sectors there are two doubled scales per side.

Dimensions

13-3/4 inches (34 cm) overall

Circa

c. second half 17th century

Country of manufacture

France

Category: Calculating

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. 

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US TESSERACT

David and Yola Coffeen both have enjoyed academic careers, as planetary astronomer and as linguist/educator. But since 1982 (yes, 1982!) they have been full-time dealers in early scientific and medical instruments, under the name Tesseract. Selling primarily by catalogue (over 100 issued so far) they also have a web presence at www.etesseract.com, and can be contacted at mail@etesseract.com.

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