A LARGE THOMAS HARRIS & SONS BRASS COMPOUND MONOCULAR MICROSCOPE, English, about 1830.
signed on the base Thos Harris & Sons, Opticians to the royal Family No. 52 Opposite the British Museum London.
Double pillar construction with swival compound tube and simple lens mount for dissection, mechanical stage with Bonanni sprung stage and plano concave reflector below, on circular base with ocular and objective. 48cm (19 inc.) high.