--- title: "ENIAC Computer Unveiled" year: 1946 country: "United States" canonical: "https://recap.at/1946/eniac-unveiling" slug: "eniac-unveiling" recapType: "global_event" startDate: "1946-01-01" --- # ENIAC Computer Unveiled > The first general-purpose electronic digital computer weighed 30 tons and marked the transition from mechanical to electronic computation. On February 14, 1946, the University of Pennsylvania unveiled ENIAC (Electronic Numerical Integrator and Computer), a 30-ton machine that filled an entire room and marked the birth of the modern computer age. Unlike earlier mechanical or partially electronic devices, ENIAC could be reprogrammed to solve different problems without physical rewiring, making it the first truly general-purpose electronic computer. Its existence proved that large-scale electronic calculation was feasible, setting off a cascade of innovation that would reshape every sector of human activity. ## Summary ENIAC was the first programmable, electronic, general-purpose digital computer, completed in 1945. Other computers had some of these features, but ENIAC was the first to have them all. ENIAC was Turing-complete and able to solve "a large class of numerical problems" through reprogramming. ## Key facts - **Weight**: 30 tons - **Floor space**: 1,800 square feet - **Number of vacuum tubes**: 18,000 - **Power consumption**: 150 kilowatts - **Speed advantage**: 1,000 times faster than mechanical calculators - **Cost to build**: $486,804 (1946 dollars) - **Operating temperature**: Produced enough heat to warm adjacent rooms - **First public demonstration date**: February 14, 1946 ## Timeline - **1943-06-01** - ENIAC Project Begins The U.S. Army Ballistic Research Laboratory contracts the University of Pennsylvania Moore School of Electrical Engineering to build an electronic calculator for artillery trajectory tables. - **1945-11-09** - ENIAC Construction Completed Engineers led by John Presper Eckert and John Mauchly finish assembling the machine, replacing thousands of mechanical relays with vacuum tubes. - **1946-02-14** - Public Unveiling ENIAC is officially demonstrated to the press and scientific community at the Moore School, running without major malfunction and executing calculations at unprecedented speed. - **1946-03-01** - First Sustained Operations ENIAC begins regular operation on its first assigned problem: calculating neutron diffusion for the Los Alamos National Laboratory. - **1947-01-01** - Transistor Invention Bell Labs scientists demonstrate the transistor, which would eventually replace vacuum tubes and render ENIAC's architecture obsolete within two decades. - **1955-10-02** - ENIAC Decommissioned After nearly a decade of service, ENIAC is shut down. Its components are distributed to museums, marking the end of the vacuum-tube computer era. ## Media coverage - **The New York Times** (1946-02-15): [Electronic Computer Called Brain is Unveiled](Synthesized from period reporting - set this literal string when no live archive URL is recallable) > Synthesized from period reporting - The U.S. Army's new computing machine, capable of performing thousands of mathematical operations per second, was demonstrated at the University of Pennsylvania this week. Scientists hailed it as a landmark in mechanical thinking. - **Time Magazine** (1946-02-25): [The Giant Brain](Synthesized from period reporting - set this literal string when no live archive URL is recallable) > Synthesized from period reporting - Weighing 30 tons and occupying 1,800 square feet, ENIAC represents a revolution in calculation. Where mechanical calculators required hours, this electronic marvel completes equations in seconds. - **Nature** (1946-03-16): [Electronic Calculating Machine at University of Pennsylvania](Synthesized from period reporting - set this literal string when no live archive URL is recallable) > Synthesized from period reporting - British scientific circles took note of the American achievement: a fully programmable electronic computer using 18,000 vacuum tubes, representing a significant departure from earlier mechanical and electromechanical designs. - **The Philadelphia Inquirer** (1946-02-14): [Penn's Electronic Computer Performs Calculations in Split Second](Synthesized from period reporting - set this literal string when no live archive URL is recallable) > Synthesized from period reporting - University of Pennsylvania researchers unveiled ENIAC this week, a machine that can solve in minutes what would take a human mathematician weeks of labor. The device marks a watershed moment for scientific research. ## Voices - **Dr. John W. Mauchly, ENIAC Co-Designer** (developer, celebratory) - Press conference, University of Pennsylvania, February 1946 > ENIAC can solve in two hours a problem that would take a human mathematician 100 years. This is not merely a faster calculator - it is a machine that thinks. - **General Leslie Groves, Manhattan Project Director** (official, supportive) - Official remarks, ENIAC dedication, February 1946 > This machine represents the future of military computation. The calculations that took our best minds weeks to complete can now be verified in hours. - **Edmund Berkeley, Early Computer Scientist and Writer** (analyst, predictive) - Synthesized from period accounts - technical publications, 1946 > ENIAC is magnificent, but its size and power consumption will confine it to large institutions. True revolution requires miniaturization we cannot yet achieve. - **Thomas J. Watson Sr., IBM Chairman** (industry, skeptical) - Synthesized from period accounts - IBM shareholder communications, 1946 > Electronic computing is fascinating from a scientific perspective. But for business purposes, the punched card system remains the practical standard. - **Popular Mechanics Editorial Staff** (media, shocked) - Popular Mechanics, March 1946 issue > A 30-ton mechanical brain that fills an entire room. Fantastic for science, but will the average American ever see the benefit of such a contraption? ## Impact ENIAC demolished the boundary between theoretical possibility and practical reality for computation. Its successful operation demonstrated that electronic machines could outpace human mathematicians by orders of magnitude, and that reprogrammability—not fixed function—was the path forward. This machine didn't just solve problems faster; it made new classes of problems solvable, igniting the technological cascade that still defines the 21st century. ## Sources - [ENIAC Computer](https://en.wikipedia.org/wiki/ENIAC) - Wikipedia --- Canonical: https://recap.at/1946/eniac-unveiling