Cloud chamber
A cloud chamber is a Détecteur of particles in which the ionization produced by the passage of a particle charged in a gas saturated with vapor causes the formation of droplets of condensation along the trajectory, which makes it possible to visualize it and photograph it. Each type of particle (Proton, electron and Positon, for example) produced a characteristic trace which makes it possible to identify it.
Invented in 1912 by the Scottish physicist Wilson and used until in the years 1950, this type of detector was supplanted by the Bubble chamber, more powerful.
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