Cavendish Laboratory : CTR Wilson's original cloud chamber
Cavendish Laboratory
<p style='text-align: justify;'>Photograph of CTR Wilson's 1911 (original) cloud chamber. By 1910, rays emitted from radioactive substances were better understood. Wilson realised that he might be able to image the tracks of particles by photographing streams of water droplets condensing onto ions created as particles passed through the chamber. (Longair, 2016, pp. 156-157)</p>