Abstract
WE have taken a number of photographs with a counter-controlled cloud chamber in a tunnel 30 m. under London clay. (1) 630 photographs were taken with a 1·4 cm. lead plate inside the chamber; (2) 948 photographs were taken with a 2·5 cm. lead plate inside the chamber; (3) 780 photographs were taken with a 2·5 cm. lead plate inside the chamber and 15 cm. of lead above the chamber.
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