Protractor, John Marten Clearly, 1814 – 1820 Canvas Print
Brass conveyor or degree arch in a wooden box. The radius of the degree arc is 102 mm. The center of the arc is indicated by an iron needle, and the instrument has an arm with a nonius on the arch. Two visors can be mounted on the arm. A loose visor needle has been added. Kleman made this transporter on the instructions of captain C. Jager.
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