Copy from Hans Holbein the Younger (ca. 1497-1543)
Portrait of Nikolaus Kratzer, 20th century
Florence, Istituto e Museo di Storia della Scienza, inv. 3566

German mathematician Nikolaus Kratzer (1487-1550) taught at Oxford and built several outstandingly beautiful sundials. Holbein the Younger portrayed him in his laboratory, surrounded by his instruments.