A 19th-Century mining tacheometer, by E T Newton & Son Camborne Cornwall, the limb with twin fixed sights and bubble level, the vertical half-circle engraved 0-100° (X 2), with silvered vernier and vertical fine screw adjustment, the horizontal plate with level and cross-bubble, (compass lacking), engraved silvered chamfered horizontal circle with 2 verniers, with trough compass and staff mounting, overall height 12¾ins. (32.3cm.).