A picture of a section of the ENIAC and the operators
(Electronic Numerical Integrator And Computer)
The ENIAC was commissioned by the military on May 31, 1943, for the purpose of guiding missiles. It was to be designed and built by John Mauchly and John Presper Eckert, who had previously sought funding for a computer. The computer used the base-ten system instead of the binary used by the ABC. The ENIAC had over 17,000 vacuum tubes, 70,000 resistors, 10,000 capacitors, 1,500 relays, 6,000 switches that had to be flipped by hand, and around 5 million welded joints.