Photogravure after a photograph taken by Nicola Perscheid in 1906, of the German physicist Wilhelm Konrad Roentgen (1845-1923). Originally an engineering student at Zurich Polytechnic, Roentgen turned to physics becoming Profesor of Physics at Strasbourg, Giesen, Wurzburg and Munich Universities. On 8 November 1895 he discovered X-rays - the 'X' signified their unknown origin. X-rays travelled in a straight-line and pased through card, but could be detected by a photographic plate or fluorescent screen. Later, he found that they were able to pas through flesh and take photographic images of bones inside the body. In 1901, he was the first recipient of the Nobel Prize for Physics. Published by Photographische Gesellschaft, Berlin, c 1910. Dimensions: 460mm x 340mm.
© Science Museum / Science & Society Picture Library