John Presper Eckert
Although today’s subject is American engineer and inventor John Presper
Eckert (April 9, 1919 – June 3, 1995), the story is more about the invention
of the “first” computer. Part of the controversy over who first built a
computer depends upon the definition of “computer” is used. Blaise Pascal
and Gottfried Leibniz invented mechanical calculating machines during the
17
th
century. Charles Babbage is generally credited with having conceived the
first digital computer. His Analytical Engine was a mechanical device designed to combine basic
arithmetic operations with decisions based on its own computations. Unfortunately, he was unable to
complete the engine he envisioned. In 1936 Alan Turing proposed the idea of a machine capable of
processing equations without human involvement. At the beginning of 1943, while working on
breaking the German’s secret Enigma Code, Turing and other cryptographers constructed an electronic
machine, the Colossus, to decode the German cipher. One might make a claim for Colossus as the
earliest working programmable electronic computer, even though it was a special purpose instrument,
suitable only for a limited number of tasks.
J. Presper Eckert was born in Philadelphia, the only son of a prominent real estate developer. At the
William Penn Charter School, he was recognized for his exceptional mathematical abilities and his
electronic ingenuity. In 1937 Eckert entered the Moore School of Electrical Engineering at the
University of Pennsylvania, where he received a B.S. and M.S. in electrical engineering. He was such
an engineering genius that he was given a post teaching electronics at the school soon after his
graduation. At this time the Moore School was deeply involved in research to aid the war efforts. John
William Mauchly was one of Eckert’s students in a training course in electronics. The former held a
doctorate in physics from John Hopkins University. Mauchly accepted a position as an instructor at the
Moore School, where he and Eckert became close friends and spent many hours discussing their mutual
interest in designing and constructing computers.
The Moore School did research using early forms of computers, including a Bush differential analyzer,
designed by Vannevar Bush and his colleagues at MIT. The machine was a general-purpose analog
computer, driven by electric motors, which was used to solve problems involving differential equations.
Copies of the analyzer were widely employed in the war effort, especially in creating firing and
bombing tables. The analyzer consisted of replaceable shafts, gears, wheels, handles, electric motors,
and disks; and it required much manual work to set it up. Eckert and Mauchly had ideas on how to
construct a better computer. When their proposal for the design of a computer resulted in a $400,000
contract from the Army, they collaborated on the construction of the Electronic Integrator and
Computer ( ENIAC), a general-purpose computer.
Completed in February 1946, the ENIAC contained some 18,000 vacuum tubes and measured about 8
feet in height and 80 feet in length. It was more than 1000 times faster than its electromechanical
predecessors and could perform up to 5,000 additions per second. Although the war was over by the
time the ENIAC was operational, John von Neumann used it while working on top-secret problems
associated with the development of nuclear weapons. When the University of Pennsylvania asked
Eckert and Mauchly to sign over the ENIAC patent, they refused and in October 1946 left to form their
own computer company. They received an order from Northrop Aircraft Company to build the Binary
Automatic Computer ( BINAC). The National Bureau of Standards contracted with them to build the
Universal Automatic Computer ( UNIVAC), the first computer produced for commercial use in the
United States.
In 1950 Remington Rand Corporation acquired the Eckert-Mauchly Computer Corporation and the
rights to the ENIAC patent. Eckert remained with the firm and became an executive of the corporation
when it merged with the Burroughs Corporation to become Unisys. Mauchly left the company to form
Mauchly Associates of which he was president from 1959 to 1965, when he became chairman of the
board. In 1966 Eckert and Mauchly shared the Harry M. Goode Memorial Award given by the
Computer Society for their “pioneering contributions to automatic computing by participating in the
design and construction of the ENIAC, the world’s first all-electronic computer, and of the BINAC and
the UNIVAC …” Mauchly felt it was a shame that he was best known for the invention of a computer
when he had also invented the skateboard, which he considered an equally revolutionary tool. Mauchly
died in Ambler, Pennsylvania at age 72. Eckert died of complications relating to leukemia in Bryn
Mawr, Pennsylvania at age 76.
Eckert and Mauchly’s story is incomplete without mentioning the Atanasoff controversy over priority
and purported “piracy.” In the mid 1930s Iowa State mathematician and physicist John Vincent
Atanasoff concluded that the computational devices existing at the time were too slow and inaccurate
for his purposes. With the assistance of his graduate student Clifford Berry, Atanasoff designed and
constructed the Atanasoff Berry Computer (ABC) in 1939. Compared to today’s computers it was slow
and had a miniscule memory. It was the first data processing machine to employ ideas such as the
binary system, separate memory and computing functions, internal clock control, and the use of circuits
for logical addition and subtraction. Because of wartime demands, Atanasoff was never able to get a
patent for his invention. It was stored in the basement of the physics building and cannibalized for parts
for other projects without Atanasoff’s knowledge.
In 1940 Atanasoff met Mauchly, described his computer, and unwisely agreed to show it to his new
acquaintance. Mauchly spent several days at Atanasoff’s home where the inventor extensively briefed
his guest about the computer and demonstrated it for his visitor. He even allowed Mauchly to leave
with papers describing its design. Many of Atanasoff’s ideas were used in the design of ENIAC, leading
to charges of piracy to be leveled against Mauchly. A long trial ensued and finally on October 19, 1973
Atanasoff was given the recognition and credit he deserved. In his ruling Federal Judge Earl R. Larson
specified that “Eckert and Mauchly did not themselves first invent the automatic electronic computer,
but instead derived that subject matter from Dr. John Vincent Atanasoff.” The judge declared the
ENIAC patent of Eckert and Mauchly to be invalid. The duo disputed the finding throughout their lives.
In 1990 President George H. Bush acknowledged Atanasoff’s pioneering work in computers by
awarding him the National Medal of Technology.
Quotation of the Day:
I have always taken the position that there is enough credit for everyone in
the invention and development of the electronic computer.” – John V. Atanasoff
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