Expansion cloud chamber for observing the paths of α-rays. Cover and sidewall are of glass (Duran).
By compressing the attached rubber ball and then allowing it to expand, a supersaturated isopropanol-water mixture is produced in the cloud chamber. Following that, the paths of the α-rays revealed by droplet formation are visible for 1 – 2 seconds in the light of an optical lamp.
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(230 V, 50/60 Hz), 1012819 [U8482530-230], Electron Tubes D](/thumblibrary/U8482530-230/U8482530-230_01_140_140_Premium-Franck-Hertz-Experiment-Power-Supply-230-V-5060-Hz.jpg)