This year marks 75 years since one of the most important devices in the history of computing was first turned on. On June 14, 1951, UNIVAC I, short for Universal Automatic Computer, was officially dedicated in the United States.
Census Bureau offices, just months after the agency signed a contract for the machine on March 31, 1951. Manufactured by the same engineers behind the wartime ENIAC, the UNIVAC I was America’s first computer designed and sold for commercial, nonmilitary use. He would go on to become a household name, famously predicting a US presidential election on live television. Here’s a look at the device that helped launch the era of modern computing.
WHAT IS UNIVAC I, WORLD The first commercial computer
For decades before I arrived at UNIVAC, the U.S. Census Bureau had relied on updated versions of the electric counting machines invented by Herman Hollerith in 1890 to process census data, all the way through the 1940 Census. While these machines were able to tabulate punched cards faster than manual counting, they were not able to handle the increasing volume of data that the bureau handled every decade.That changed during World War II, when the War Department began exploring electronic digital computers to process ballistic calculations, work that eventually led to the construction of ENIAC in 1946.
The engineers behind ENIAC quickly realized that their innovation had potential in peacetime as well. According to the Census Bureau, this realization eventually led to UNIVAC, a virtually updated version of ENIAC, designed specifically for tabulating large amounts of business and administrative data rather than complex scientific calculations.Unlike ENIAC, UNIVAC was built from the ground up as a commercial product, one that any government agency or large corporation could, in theory, buy and use.
The final computer was a massive piece of engineering, filling an entire room and requiring a dedicated cooling system to manage the heat generated by its thousands of internal components.
How Eckert and Mochley built the UNIVAC I system for the US Census Bureau
UNIVAC I was designed by J. Presper Eckert and John Mauchly, the same engineering duo responsible for ENIAC. During the ENIAC project, my client had discussions with Census Bureau officials about potential nonmilitary uses for electronic computers.
In 1946, the duo received a study contract from the National Bureau of Standards to explore what a computer designed specifically for the Census Bureau might look like, work that eventually produced the Universal Automatic Computer Specification.Construction took several years, and according to the Computer History Museum, the finished machine was built around additional modules, with twelve chassis mounted in each section, three sections forming a pod, and thirteen pods forming the sides of the mainframe.
Along with the main unit, Eckert and Moschli introduced the Uniservo magnetic tape drive, the first disk drive designed for a commercially sold computer, which could read and write data approximately ten times faster than the punched card systems it was intended to replace.The final UNIVAC I passed Census Bureau tests in 1951, with an official later testifying that no fault was ever found with the machine.
UNIVAC I’s famous prediction of the 1952 election made computers a household name
UNIVAC would have remained a specialized government instrument had it not been for one night in November 1952.
For the presidential election between Dwight D. Eisenhower and Adlai Stevenson, the CBS television network borrowed UNIVAC I, the fifth unit ever built and originally built for the U.S. Atomic Energy Commission, and used it to predict the score live on air.According to the Computer History Museum, opinion polls at the time favored Stevenson, but early UNIVAC calculations pointed strongly toward a landslide for Eisenhower. CBS was initially reluctant to broadcast such a lopsided prediction and asked engineers to double-check the numbers.
By the end of the night, the original prediction turned out to be essentially correct, and Eisenhower won in a landslide.Broadcasting was a turning point for public awareness of computing. For the first time, millions of ordinary Americans watched the “electronic mind” make sense of real-world data on live television, and the name UNIVAC briefly became a generic term used by many people for any computer at all.
UNIVAC I’s legacy, 75 years later
The success of UNIVAC I at the Census Bureau also led to other innovations. To speed up the data processing process, which was still suffering from a bottleneck due to punched cards, scientists from the National Bureau of Standards and engineers at the Census Bureau developed FOSDIC, the film optical sensor for computer input, which was completed in 1954. According to the Census Bureau, FOSDIC could read pencil-filled circles in questionnaires and convert them directly into computer-readable data stored on magnetic tape, and was first used in the complete census conducted every decade. Years in 1960.Over the following years, dozens of UNIVAC systems were installed in government and industry, with the last units remaining in operation into the 1970s. While the machines themselves have long been retired, their basic ideas, stored programs, magnetic tape storage, and computers designed for everyday work tasks rather than simply scientific research, remain at the heart of how computers work today.Seventy-five years after its launch, the UNIVAC 1 is remembered not just as a piece of hardware, but as when computing ceased to be a wartime experiment and became part of ordinary public and administrative life, a reminder that many of the conveniences we take for granted today have their roots in a single device powered three-quarters of a century ago.