HARRISBURG, Pa.  — Rare film footage featuring President Franklin D. Roosevelt walking to his seat at a baseball game helps dispel the myth that he completely hid his disability and shows the courage it took to go about his daily life, experts said Friday.

The clip shows FDR, who was paralyzed from the waist down by polio in 1921, grasping a rail with one hand while being supported on the other side by an assistant. FDR used a wheelchair because he could walk only with braces on his legs and the support of a cane.

“Here is FDR going to a stadium full of people,” said Bob Clark, deputy director of FDR’s Presidential Library and Museum. “Even the simple act of going to a baseball game required a great deal of logistics and preparation.”

Former Major League Baseball player Jimmie DeShong shot the film at the 1937 All-Star game in Washington. On Thursday, the Pennsylvania State Archives in Harrisburg announced it had acquired the clip from the family of DeShong, a native of the state’s capital city.

DeShong’s daughter Judy Savastio said she showed the clip to officials at the FDR library in Hyde Park, New York, about two years ago. She allowed the footage to be used in a montage that has been on view at the museum for about a year.