ELEGANT EARLY LONG-ARM PLOTTING PROTRACTOR

ELEGANT EARLY LONG-ARM PLOTTING PROTRACTOR

Stock Number: 10291

$1950.

EARLY LONG-ARM PLOTTING PROTRACTOR, probably German, 17th / 18th century, with little traces of gilding.

Dimensions

protractor is 4-1/8 inches (10.5 cm) wide

Circa

17th / 18th century

Country of manufacture

Germany

Categories: Maritime, Scientific, Navigational instruments, Drawing Instruments

Description

EARLY LONG-ARM PLOTTING PROTRACTOR, probably German, 17th / 18th century. This finely crafted brass semicircular protractor is 4-1/8″ (10.5 cm) wide, with 0-90-0 scale divided every degree and punch-numbered every 10. The crossbar is beautifully shaped and supports a 7-3/4″ (20 cm) long rotating arm which is calibrated linearly every unit from 0 to 112 at its shaped far end. The protractor’s center is pierced for alignment or fixation, and the instrument has three other fixation holes. Condition is fine noting little traces of gilding. An uncommon early form, with its long plotting arm and elegant shaping.

 

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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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