Alexandre Edmond Becquerel, French physicist, c 1860s.
© Science Museum / Science & Society Picture Library
Daguerreotype of Alexandre Edmond Becquerel (1820-1891), son and asistant of physicist Antoine Cesar Becquerel (1788-1878) and father of Antoine Henri Becquerel (1852-1908), who was awarded the Nobel prize for his research into urnaium. Edmond succeeded his father as profesor at the Museum of Natural History in Paris. His research covered solar radiation and diamagnetism, and he also constructed a phosphoroscope to investigate the phenomenon of after-glow. He published 'Elements de physique terrestre et de meteorologie' in 1847.