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The only real disappointment of his business career was an atomic energy set that he introduced a few years ago, with a Geiger counter, uranium-bearing ore and other nuclear equipment. Gilbert was dismayed to discover that people had such confidence in his sets (Columbia University bought five for its physics department) that they feared that boys would make atomic bombs. After a flood of protests, Gilbert dropped the set.
In recent years A. C. Gilbert complained that the flow of ideas no longer came as quickly as it used to. Early this month he suffered a heart attack, and fortnight ago went to Boston's New England Baptist Hospital for treatment. There last week, just when he seemed to be getting his athlete's second wind, Alfred Carlton Gilbert died of another heart attack, still young at 76.