Coumpound monocular microscope, with lever stage, broken base, Continental, mid 19th century Coumpound monocular microscope 1850-1880
Retort stand, metal base, wood stanchion, holder arm separate, European, early 20th century Retort Stand 1901-1930
Experimental compound speculum mirror of 2 feet diameter, made by the 3rd Earl of Rosse. The 9 segments of speculum metal, are held in an alloy of copper and zinc. Experimental compound speculum mirror of 2 feet diameter 1840-1845