Abstract
Production of penetrating showers in lead has been observed in a cloud chamber containing eight \textonehalf{}-inch thick lead plates. In over half of the 53 examples of penetrating showers photographed high, energy electronic radiation was simultaneously produced. Many examples of mesons accompanying air showers were observed, but no production of penetrating particles in lead by electronic radiation was observed. The pictures taken give general support to recent theoretical speculation that the primary radiation produces penetrating particles and electronic radiation in the same event.
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