Ione Naish "Nonie" Faro, 100, a mathematician and physicist who conducted wind tunnel and missile research at the Johns Hopkins University Applied Physics Laboratory, died Nov. 14 at a retirement facility in Charlottesville. She had congestive heart failure.

Early in World War II, Mrs. Faro worked for the National Defense Research Committee. She helped analyze the variable-time radio-proximity fuse. The VT fuse was an electronic device in an artillery shell that caused it to explode near the target. Earlier shells used a fixed-time fuse.

From 1944 to 1972 at the Applied Physics Lab, she helped create a wind tunnel that was used in the design of missiles and rockets. In her final lab assignment, she helped develop the concept of what became the Tomahawk cruise missile.

Mrs. Faro edited several volumes of "The Aerodynamics Handbook," a guide to aerodynamics theory and testing.

After retiring, she spent her time knitting and working on cryptograms. She moved to Charlottesville from Washington in the late 1980s.

A well-manicured and gregarious woman, she had a coy answer to those asking about her career: "I was a math teacher."

Mrs. Faro was born in Sheffield, England. She received a bachelor's degree in mathematics and a master's degree in pure and applied mathematics and physics, both from the University of Sheffield.

Before settling in the Washington area about 1940, she taught high school math in Salt Lake City and advanced calculus to military officers at the College of William and Mary.

She became a U.S. citizen at the start of World War II.

Her marriage to Kyle Berkley ended in divorce. Her second husband, Edward Faro, died in 1985.

Survivors include a daughter adopted during her first marriage, Marion Nolan of Charlottesville; two grandchildren; and a great-granddaughter.