A lacquered brass monocular microscope signed Ross London 3663 body tube, arm with fine focusing screw, locking screw to limb, rack and pinion focusing, rackwork to rectangular sectioned bar, square stage, plano-concave mirror on an articulated arm and sliding collar, Ross pattern 'Y' shaped foot, (mid 19th century fitted mahogany case with accessorie) - 17½in (44.5cm) high