Cmdr. Ball, who was born in Hyde Park, Mass., and lived in Quincy, served 23 years in the Coast Guard.
His career included more than 11 years of sea duty. He was commander of the U.S. Coast Guard cutter Tamaroa out of New York City, chief engineer of the icebreaker Mackinaw on the Great Lakes and sailing instructor on the bark Eagle and had assignments on the buoy tender Evergreen in Greenland.
He served on the cutter Castlerock on weather patrol and search and rescue and on the destroyer escort Camp in World War II. He taught physics at the U.S. Coast Guard Academy for two years and had assignments in the office of Merchant Marine Safety in Washington and New York.
He graduated from the Lowell Institute School of the Massachusetts Institute of Technology in 1941 and the U.S. Coast Guard Academy in 1945. In 1954, he received a naval engineer degree with honors from MIT.
He was a member of the Society of Naval Architects and Marine Engineers and a Mason for 37 years. He was a life member of the Disabled American Veterans and the Retired Officers Association.
Survivors include his wife, whom he married in 1947, Winifred B. Ball of Potomac; three children, Valerie A. Sabbatini of Annapolis, Linda B. Hanson of Potomac and William D. Ball III of West Palm Beach, Fla.; and six grandchildren.
Linda Dunbar Kravitz Knox Researcher, Volunteer
Linda Dunbar Kravitz Knox, 61, research director in the late 1970s and 1980s for the Housing Assistance Council, a nonprofit group that specializes in rural housing, died March 19 at her home in Chevy Chase. She had cancer.
Early in her career, she did research work in Washington for the Agribusiness Accountability Project and wrote "Who's Minding the Co-op?: A Report on Farmer Control of Farmer Cooperatives" (1974).
At the council, she wrote "Taking Stock: Rural People and Poverty From 1970 to 1983" (1984).
Another of her book projects, "Hard Traveling: Migrant Farm Workers in America" (1976), was sponsored by the Children's Defense Fund. The book was co-written with her brother, Tony Dunbar of New Orleans.
Most recently, she was writing a history of the U.S. National Arboretum, where she volunteered.
She was a Baltimore native and a 1965 graduate of Swarthmore College in Pennsylvania. She received a master's degree in geography from the University of Maryland.
She was active in the Audubon Society, the League of Women Voters, the Sierra Club and Eistophos Science Club.
She was one of the original incorporators of the Bethesda Co-op.
A Quaker, she attended Bethesda Friends Meeting. She also participated in peace and antiwar demonstrations.
Her marriage to Jerome Kravitz ended in divorce.