Brass Miner's Dial by Hall Brothers, with silvered 4 1/2-inch dial engraved Hall Bros., Clerkenwell, London, 1926, two inset vials, East and West points reversed, divided 0-90 in four quadrants, needle ring calibrated 0-360, polished steel needle with lifter operated by screw at the side, gimbal-mounted compass box with silvered vernier, 2 1/2-inch inclinometer dial engraved Diff. of Hypo. & Base, threaded tripod mount, and screw-on standards supporting 13-inch lg. focusing telescope with vial below, lg. 13 3/4, ht. 7 in. level, (lacquer removed).