A late 18th-Century mining compass, unsigned, the mahogany frame incorporating the compass with silvered dial, 2 horizontal circles with punched scales, one divided in 4 quadrants, the plain blued-iron needle on pivot with agate cap and clamp, the sighting alidade with 2 fixed sights and bubble level, on folding tripod stand, overall height - 13¼in. (33.7cm.).