a US Civil Service ad in The Philadelphia Inquirer looking for women with degrees in mathematics. During World War II, the US Army was hiring women to calculate bullet and missile trajectories at Ballistic Research Laboratory, which had been established at the Aberdeen Proving Ground in Aberdeen, Maryland, with staff from both the Aberdeen Proving Ground and the Moore School of Engineering at the University of Pennsylvania . She immediately called her two fellow math majors, Frances Bilas and Josephine Benson about the ad. Benson couldn't meet up with them, so Antonelli and Bilas met in Philadelphia one morning in June 1942 for an interview in a building on South Broad Street (likely the Union League of Philadelphia Building). One week later, they were both hired as human "computers" at a pay grade of SP-4, a subprofessional civil service grade. The starting pay was $1620 annually. Antonelli stated the pay was "very good at the time". They were notified to report to work at the Moore School of Engineering. Their job was to compute ballistics trajectories used for artillery firing tables, mostly using mechanical desk calculators and extremely large sheets of columned paper. The pay was low, but both Antonelli and Bilas were satisfied to have attained employment that used their educations and that served the war effort. Her official civil service title, as printed on her employment documentation, was "computer." She and Bilas began work with about 10 other "girls" (as the female computers were called) and 4 men—a group recently brought to the Moore School from Aberdeen Proving Grounds. Antonelli and Bilas conducted their work in a large, former classroom in the Moore School; the same room would later be the one where the ENIAC was built and operated until December 1946. Despite all their coursework, their mathematics training had not prepared Antonelli and Bilas for their work calculating trajectories for firing tables: they were both unfamiliar with numerical integration methods used to compute the trajectories, and the textbook lent to them to study from (Numerical Mathematical Analysis, 1st Edition by James B. Scarborough, Oxford University Press, 1930) provided little enlightenment. The two newcomers ultimately learned how to perform the steps of their calculations, accurate to ten decimal places, through practice and the advisement of a respected supervisor, Lila Todd. A total of about 75 female computers were employed at the Moore School in this period, many of