THE PROTRACTING COMPASS OF AUGUSTE COEURET, French, late 19th century. This fine instrument measures 6-3/4” (17cm) long (closed), constructed of bright plated brass with twin pivoting arms, one carrying a pinhole sight, the other a cross sight and glazed compass. The arms are beveled with sharp straight edges in line with the center of rotation, one arm graduated every 0.5 mm from 0 to 9 cm. The compass has a circumferential degree scale for the needle, and semicircular degree
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