A 19th-Century continental-pattern compound monocular microscope, signed Chadburn & Brothers Opticians Sheffield, with sliding draw-tube focusing and fine-screw adjustment, the body-limb mounted on the circular stage incorporating a sub-stage condenser, the drum base with moulded foot, with four objectives and other accessories, in fitted mahogany case with brass carrying handle -- 13 3/8in. (34cm.) wide