A lacquered and oxidised-brass Petrological monocular microscope, signed on the horse-shoe stand J SWIFT & SON LONDON, the body-tube arranged to rotate by rack gearing to Swift & Son patent, with conventional rack and pinion focusing and micrometer fine adjustment, fitted with two prism slides, external magnifier, double nose-piece, the stage with "marbled" decoration and condenser slide, the sub-stage condenser with silvered circle, geared and micrometer adjustment, the lower limb with plano-concave mirror, with three objectives, bull's-eye condenser and other items, in fitted mahogany case -- 13in. (33cm.) wide