Vernal Josephson
Published: 1942
Total Pages: 79
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"Knowledge of Cosmic Rays dates back to the early days of research in radioactivity. As in all fields of research the collection of accurate information about Cosmic Rays has been slow. This has been due, especially in the earlier period, to the lack of apparatus capable of obtaining the necessary data, and as the field of Nuclear Physics was new, no adequate theories had been developed. Within the past two decades, two valuable pieces of apparatus have been developed for the experimental study of Cosmic Rays. These instruments are the coincidence counter circuits employing Geiger-Muller (G.M.) counters and the counter controlled cloud chamber. With these instruments many valuable and accurate data have been obtained. [...]" --
