Profesor John Percy's metallurgical laboratory, 1877.
© Science Museum / Science & Society Picture Library
Oil painting of Profesor John Percy's metallurgical laboratory at the Royal School of Mines, Jermyn Street, London. Percy (1817-1889), the first Profesor of Metallurgy at the School of Mines, invented a method of extracting silver from its ores. He accumulated a large metallurgical collection which was bought by what is now the Science Museum, London.