SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Wilhelm Roentgen. Portrait of German physicist Wilhelm Konrad Roentgen (1845-1923), made shortly after his discovery of X-rays in 1895. Roentgen was professor of physics at Wurzburg. While using an electric discharge tube in a darkened room he noticed that a card coated with barium platinocyanide glowed when the tube was switched on. The radiation causing this effect was not blocked by an intervening wall or even by a thin sheet of metal. Roentgen called the new rays X- rays and suggested they were a form of electromagnetic radiation akin to light but of shorter wavelength. The discovery won him the first Nobel Prize for physics, in 1901.
Model release not available. Property release not required.