Hidden Figures: The American Dream and the Untold Story of the Black Women Mathematicians Who Helped Win the Space Race

by Margot Lee Shetterly

From the beginning, Czarnecki had put Mary at the controls in the wind tunnel, showing her how to fire up the tunnel’s roaring sixty-thousand-horsepower engines (the noise from years of work in the tunnel eventually damaging Mary’s hearing). He showed her how to work with the mechanics to correctly position a model in the test section. One test required Mary to clamber onto the catwalk of the wind tunnel, measuring how rivets disrupted the airflow over a particular model. Another involved turning the tunnel’s Mach 2 winds on a series of sharp-nosed metal cones to discover the point at which the smooth air flowing over the cones became turbulent. The research had application to the design of missiles, of great interest as the United States sought to gain every possible military and technological advantage over the Soviet Union. The results of the work would come to fruition in 1958, in Mary’s first report, coauthored with Czarnecki: “Effects on Nose Angle and Mach Number on Transition on Cones at Supersonic Speeds,” published in September 1958.