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Harold Zahl ’27

Physics major

A worldwide figure in electronic inventions, Harold Zahl, Ph.D., worked on thermal and radio transmission detection, holding six major patents in what would become radar technology. His greatest contribution to radar was developing a transmitter small enough to be used on planes and ground stations. This “Zahl tube,” as it came to be known, was a crucial breakthrough in the years prior to the United States entering World War II.

Zahl received the Outstanding Alumni Award from North Central College in 1964.