Monocular microscope with binocular tube also, serial no. 1721, by Andrew Ross, London, and Sands and Hunter, 20 Cranbourn Street, London, WC, England, 1850-1875. Monocular microscope with binocular tube also 1850-1875
Exhibition binocular microscope by Negretti and Zambra, London, won gold medal at Philadelphia in 1876 Exhibition binocular microscope by Negretti and Zambra 1870-1876
