took on new urgency with the American entry into the war. The project, also known as the SIGSALY system, consisted of “some forty racks of vacuum tube–powered electrical equipment weighing about fifty-five tons, taking up 2,500 square feet and requiring 30,000 watts of power.” According to one estimate, the system had a $5,000,000 budget in 1943, and it employed a platoon of thirty workers.
