Octant sold by Thomas Flint, Hull, about 1840. Ebony frame and limb with a brass index arm and fittings; inlaid ivory plates on the crossbar and on the back of the frame. Marked on the inlaid plate on the crossbar: Flint * Hull. Inlaid ivory scale from -2° to 100° every 20', measuring to 90°. Ivory vernier to 1', zero at the right. The tangent screw and clamping screw are on the back of the index arm. Three shades (two red, one green). Index-glass adjustment by screw; adjustment of the horizon glass by a fixed milled screw, and a lever, worm gear, and a milled clamping screw. The sight vane has two pinholes and a swivelling shade (red). An ivory-capped pencil is fitted in the crossbar. No box.