Helen Carusi Vischer, 81, a Washington native who became an author and who later raised thoroughbred horses in Charles County, died of arteriosclerosis May 11 at the Charles County Nursing Home in La Plata. She had lived in the nursing home since 1977.

Mrs. Vischer was the author of two books, "Washington Waltz," a 1941 work published by Alfred A. Knopf that told of her life as a diplomatic hostess, and "While They Fought," a historical work published by Charles Scribner's Sons in 1947.

She was a member of the Charles County Children's Aid Society, the Charles County Garden Club, the Daughters of the American Revolution and the Society of Daughters of 1812.

Mrs. Vischer attended the Holton-Arms School. Her father, Charles Francis Carusi, was president of the Washington board of education and chancellor of National University.

In 1927, she married Col. Emmanuel E. Lombard, the French military attache in Washington. At his death in 1946, he was a major general. Her marriage to Constantine Brown, a Washington columnist, ended in divorce.

In 1951, she married Peter Vischer, who had been an Army colonel and State Department official. They moved to "Habre de Venture," a historic house in Port Tobacco, and started a thoroughbred horse farm. Col. Vischer died in 1967.

Her survivors include a son, Charles Francis Lombard, a brother, Eugene Cassin Carusi, and a stepdaughter, Joanna Vischer Brown, all of Washington, and two grandchildren.