Two cloud chambers of the pneumatic rubber diaphragm type are described, a cylindrical one 22 cm in diameter for use with a large electromagnet, and a rectangular one of wood with sensitive volume 35×30×10 cm for cosmic‐ray shower studies. The expansion ratio is determined by the separation of rigid diaphragm stops. A description of auxiliary apparatus for control by G‐M counters and for illuminating the chambers is given.

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© 1936 American Institute of Physics.
1936
American Institute of Physics
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