A professor at an Indiana college says he has found film footage showing President Franklin Delano Roosevelt being pushed in his wheelchair, depicting a secret that was hidden from the public until after his death. Ray Begovich, a journalism professor at Franklin College south of Indianapolis, said ... he found the eight-second clip while conducting unrelated research in the National Archives in College Park, Md. Roosevelt contracted polio in 1921 at age 39 and was unable to walk without leg braces or assistance. During his four terms as president, Roosevelt often used a wheelchair in private, but not for public appearances. News photographers cooperated in concealing Roosevelt's disability, and those who did not found their camera views blocked by Secret Service agents. This raw film clip may be the first motion picture images of the president in his wheelchair, and it was never meant to be shown to the world," Begovich said. The film shows Roosevelt visiting the U.S.S. Baltimore at Pearl Harbor in July 1944. Roosevelt's disability was virtually a state secret during his presidency, which spanned the Great Depression and most of World War II.