Hamilton High School field was site of the first Civilian Defense field tests in which the radioactivity detection technique was demonstrated. Mrs. Ruth Major (right) is group instructor. Others, from left to right: Wilfred Sawyer, San Pedro Science teacher, with ionization chamber; Mrs. Lilian Ullman, information recorder; Ruth Van Vleet of Hollywood High, with geiger counter; and Dr. Nathan Herman, county engineer, who acted as communications man. Arrow points to tube of radioactive material. Photo dated: July 12, 1950.
Alexander Hamilton High School (Los Angeles, Calif.) Civil defense--California--Los Angeles Los Angeles Evening Herald and Express photographs Herald-Examiner Collection photographs
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