A 19th-Century lacquered brass compound monocular microscope, signed on the body tube limb ARTHUR CHEVALIER Palais Royal, 158, Paris, with draw tube focusing and fine wheel adjustment, plane stage, sub-stage wheel condenser and plano-concave mirror, 3 objectives, 2 eyepieces and bull's-eye condenser, in fitted mahogany case - 12¼in. (31.1cm.) wide.