In Memory
Calvin L. Ball, 73, who retired in March 1995 after 36 years of NASA service, has died. Prior to retirement, Ball served as chief engineer for the Propulsion System Division in the Aeronautics Directorate where he coordinated research in turbine and intermittent combustion engines. He began his career at the Plum Brook Station and focused individual research and writings primarily on cryogenic pumps for rockets and advanced aircraft propulsion and space power systems, including extensive work on the Space Power Brayton Cycle System, Centaur's RL–10 engine and the Supersonic Through Flow Fan program. He was awarded NASA's Exceptional Engineering Achievement Medal in 1986. Ball's government service included two years in the Army Corps of Engineers, 1957–59, onsite at Lewis Field.
Arthur D. Brenza, who retired from NASA in December 1988, has died. Brenza served as a supervisory electronics engineer prior to his retirement. His government service included four years in the U.S. Army.
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