Mabelle E. Thickstun, 82, who had played piano and organ for silent movies and then piano for dancing classes here, died Friday at Suburban Hospital in Bethesda of injuries suffered May 24 in an automobile accident.

She was riding in a car that collided with another car on Viers Mill Road in Rockville. Her husband, William Russell Thickstun, who was driving, died at the scene of the accident.

Mrs. Thickstun was born in Oxford, N.Y. She attended Greene Teachers Academy in Greene, N.Y., and taught for a year before coming here in 1918.

She worked as a clerk in the War Department and provided piano and organ music for silent films at the Circle, Tivoli and Ambassador theaters.

After talkies came in, she played piano for ballroom dancing classes and children's ballet classes at a number of private schools. She was an accompanist until the early 1960s.

The Thickstuns were married in 1919. He worked for the U.S. Weather Bureau, where he eventually retired as chief of the instrument division. They lived in Bethesda.

Survivors include a son, William R. Jr., of Potsdam, N.Y., and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Rockville Volunteer Fire Department or the Bethesda-Chevy Chase Rescue Squad.