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.