Physicists were gravely amused when ex-President Truman observed a few months ago that he was not convinced that the Russians had ever exploded any atomic bombs. The Atomic Energy Commission did not tell in detail how it keeps track of Russian progress, but Dr. James R. Arnold explained one method in the latest Bulletin of the Atomic Scientists.* Any amateur with about $1,000 for apparatus can "watch" Russian atomic explosions from his own backyard.
Independent physicists Norman J. Holter and W. R. Glasscock of Helena, Mont., reported Arnold, collected snow or rainwater and filtered...
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