C. T. R. Wilson developed the cloud chamber method for making ionization tracks visible. Expansion cools moist gas into a supersaturated state, allowing droplets to condense on ions left by a charged particle. Illumination and photography then turn an invisible passage into a track whose bends, endpoints and branches can be measured. His Nobel lecture traces the physical condensation mechanism and its use in examining ionizing radiation.[ref]
On the Cloud Method of Making Visible Ions and the Tracks of Ionizing Particles by Charles Thomson Rees Wilson. 1927 lecture, pp. 194–201, expansion, ion-induced condensation and particle tracks
A physicist.[ref]
https://makingscience.royalsociety.org/people/na7953/charles-thomson-rees-wilson. Independent professional biography and identity
Portrait of C. T. R. Wilson
. AB Lagrelius & Westphal, Stockholm, as attributed by the American Institute of Physics in the Commons File; Nobel Foundation source. Commons PD-Sweden photograph claim. File requests an additional United States public-domain tag; worldwide status is not asserted., via Wikimedia Commons. Source.
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