This elegantly decorated box, complete with lock and key, is divided into sixteen compartments. It contains an instrument for drawing ellipses, with its components (tips, keys, steel screws, arms with sliding cursors, and X-shaped base); a gunner's quadrant with folding graduated rod; three rulers (two for plotting parallel lines and one plain ruler); an instrument for measuring angles; and some accessories (screws, pins, tips, and a molded head).