539513 Henry Cavendish (1731-1810) English natural philosopher and chemist. Cavendish Physical Laboratory, Cambridge, named after him. Lithograph published c 1851 ; (add.info.: British natural philosopher, scientist, theoretical chemist and physicist. experiments with air and heat; Fellow of the Royal Society from 1760 till his death; 1781 showed that hydrogen and oxygen together produced water; in 1798 he published a paper accurately calculating the density or mass of the earth; qualities finally recognised late 19th century when the University of Cambridge named its new Cavendish Laboratory after him; Discovery of hydrogen.); Universal History Archive/UIG; out of copyright.