In the history of technology, few inventions have had as profound an impact as ENIAC – the Electronic Numerical Integrator and Computer. Launched in 1946, ENIAC was not only one of the world’s first general-purpose electronic computers but also a landmark that ushered humanity into the digital age. Let’s explore the story of this colossal machine and the fascinating facts surrounding it.
Born from Military Needs
ENIAC was designed by two brilliant engineers, John Presper Eckert and John Mauchly, at the University of Pennsylvania, USA. The project was funded by the U.S. Army’s Ballistic Research Laboratory with the primary goal of calculating artillery firing tables – a task requiring the processing of vast numbers of complex calculations in a short time. At the time, such calculations were performed manually by humans, often taking weeks or even months.
With a construction cost of approximately $487,000 (equivalent to about $7-8 million in 2025 when adjusted for inflation), ENIAC was an ambitious project that marked a close collaboration between the military, academia, and industry.
A Massive Size and Structure
ENIAC was a technological marvel of its time, but its size was truly astonishing:
Weight: Over27 tons, equivalent to the weight of 4-5 adult elephants.
Area: Occupying approximately 167 square meters, comparable to a large apartment or a conference room.
Components: The machine consisted of more than 17,468 vacuum tubes, 7,200 crystal diodes, 1,500 relays, 70,000 resistors, 10,000 capacitors, and about 5 million hand-soldered joints. The total length of wiring in ENIAC stretched for kilometers.
To operate, ENIAC consumed around 150 kW of electricity, enough to power a small neighborhood. When powered on, it often dimmed lights in the surrounding area due to its sudden power draw. Additionally, the thousands of vacuum tubes generated immense heat, requiring a complex cooling system and constant maintenance, as tubes would burn out every few hours on average.
Remarkable Performance for Its Era
In the 1940s, ENIAC represented a monumental leap in computing power. It could perform approximately 5,000 additions per second, thousands of times faster than the mechanical calculators of the time. However, ENIAC did not store programs like modern computers. To change its programming, scientists had to reconfigure its hardware by plugging and unplugging cables – a process that could take hours or even days.
Beyond calculating artillery trajectories, ENIAC was later used for scientific research, including simulations for hydrogen bombs and weather forecasting, paving the way for future computing applications.
Unsung Heroes: The ENIAC Six
One of the lesser-known stories about ENIAC is the role of six female programmers, known as the “ENIAC Six” – Kathleen McNulty, Betty Jennings, Betty Snyder, Marlyn Wescoff, Fran Bilas, and Ruth Lichterman. These women were the first to program ENIAC, teaching themselves how to operate the complex machine without formal instructions. Their contributions were overlooked for decades, but today, they are recognized as pioneers in the field of computer programming.
Legacy and Impact
ENIAC was more than just a computer; it was the foundation for the development of modern technology. It demonstrated that electronic computers could handle complex calculations at high speeds, paving the way for subsequent generations of computers, from personal computers to the internet and artificial intelligence.
Compared to modern technology, ENIAC seems rudimentary. A smartphone today is millions of times more powerful while occupying a fraction of ENIAC’s size. However, without ENIAC, the technological advancements we take for granted today might not have been possible.
The End of a Legend
ENIAC ceased operations in 1955, marking the end of an era. A portion of the machine is now displayed at the National Museum of American History in Washington, D.C., serving as a reminder of the historical turning point it represented.
Conclusion
ENIAC was not just a computer but a symbol of human ingenuity and ambition. From its massive size and enormous power consumption to the contributions of its female programmers, ENIAC is a testament to how bold ideas can change the world. More than 75 years later, ENIAC’s legacy lives on in every technological device we use daily.