A 19th-Century lacquered brass compound monocular microscope, signed on the Y-shaped base Crichton, 112 Leadenhall St , London, the body tube located on an arm with rack and pinion focusing, stage, sub-stage condenser and swivel mirror, the tubular body limb with compass joint on pillar support, with accessories, in mahogany case - 10½in. (26.7cm.) high.