In 1930, a doctor of physics named mochri in the United States was often troubled by a large number of boring and cumbersome calculations in the process of studying physics.

Therefore, he developed a simulation calculation tool – harmonic analyzer and a small special computer.

But the computing speed of both machines is very slow.

In 1940, the birth of electron tube gave mochri great confidence.

He believes that the application of electronic tubes to computing devices will certainly improve the computing speed.

However, he racked his brains and failed to come up with a design scheme for the application of electronic tubes.

On the evening of January 15, 1941, moziri, who was extremely distressed by the stagnation of research and development, picked up the day’s “Des Moines Tribune”.

A text message in the newspaper aroused his great interest: “Our news: Dr.

John atanasov, Professor of physics at Iowa College, has made an electronic computer, which works more similar to the human brain than other machines.

According to Dr.

atanasov, the machine will include more than 300 vacuum tubes and will be used to solve complex algebra.

The machine covers an area equivalent to a large desk, is completely made of electrical devices and is used for scientific research.

Atanasov has developed this machine for several years, and it will be completed in about another year.

” A photo of the electronic components is also attached to the side of the message.

Mochri read the newsletter and photos excitedly several times.

The electronic computer of my dream has long been developed and will come out soon.

He was too excited to sleep all night.

The next day, mochri left for Iowa.

He’s going to visit atanasov.

The kind atanasov warmly received mochri.

He introduced the process of developing an electronic computer to motiri in detail, and also explained his design scheme in detail.

Mochri listened attentively to atanasov’s instructions and asked some questions he didn’t understand from time to time, which atanasov answered one by one.

Finally, when mochri was about to leave, atanasov took out a notebook from the drawer and solemnly handed it to mochri, saying, “this is my years of hard work.

It records the relevant design ideas, which may be helpful to you.

Let’s contribute to the scientific cause of mankind!” Moziri knew the weight in it.

He took the notebook with trembling hands and expressed his deep gratitude to atanasov.

“Listening to your words is better than reading for ten years”.

Moziri felt that this visit made him seem to see a colorful world.

After returning to the Moore School of electrical engineering at the University of Pennsylvania, mochri was still immersed in happiness.

He carefully deliberated on the design scheme put forward by atanasov, which is indeed a careful and ingenious design scheme.

In August 1942, taking atanasov’s design scheme as the framework and combined with some of his own experience, mochri wrote a paper entitled “the use of high-speed electron tube devices”.

The original opinions and novel arguments in this paper have aroused the extensive interest of teachers and students of Moore Institute of electrical engineering.

The 23-year-old Ike, a graduate student of the college, was very excited after reading this article.

He has long been concerned about the progress of computer development and believes that there are several difficulties in the development process.

Now, moziri’s article solves these problems one by one.

Eckert visited mochri.

The more the two young people talked, the more involved they became.

They really hated meeting each other late.

They decided to work together to develop electronic computers and put their ideas into practice.

It takes a lot of money to make electronic computers.

At that time, the Second World War had broken out, and the United States had announced its participation in the war in December 1941.

During the war, only what the war needs is the most important.

They are worried about the fate of atanasov.

Originally, atanasov’s development fund was provided by the agricultural experimental station of Iowa University.

After the United States announced its participation in the war, the agricultural experimental station interrupted its funding, which wiped out atanasov’s years of hard work.

Moziri had much better luck than atanasov.

Shortly after he wrote his design paper, mochri’s unit, the Department of electrical engineering of Moore Institute of electrical engineering, was ordered to cooperate with Aberdeen ballistic Experimental Research Institute to provide the army with six fire tables every day.

This is a heavy workload.

Because each table has to calculate hundreds of trajectories, and it takes 20 hours for a skilled calculator to mechanically calculate a trajectory with a flight time of 60 seconds.

Mochri recommended his own computer design scheme to lieutenant gelstein, the representative of Aberdeen military, and stated the great significance of the computer to the military.

Gelstein showed great interest in this, and he reported this idea to the superior department.

April 9, 1943 is a day of great historical significance in the development history of modern electronic computers.

On this day, in Aberdeen, a decision-making meeting was held to decide whether to start the work of electronic computer manufacturing.

After listening to Gerstein’s brief explanation, the famous mathematician wimblen, a scientific adviser to the army, pondered for a while, then stood up and said to the director of the Aberdeen ballistic Experimental Institute, “allocate the funds to them.

” In this way, the prelude to the development of the first computer in human history began.

The development team is composed of more than 200 experts.

Moziri served as the chief designer and Eckert as the chief engineer.

After more than two years of hard work and a cost of 500000 US dollars, we finally developed the world’s first electronic computer.

It is named “electronic numerical integration and computer”, abbreviated as “ENIAC” (ENIAC).

This electronic computer is a behemoth.

It occupies six houses with an area of 170 square meters and weighs more than 30 tons.

18000 electronic tubes and 1500 relays are installed in it.

It can add and subtract 5000 times or multiply 400 times per second, which is 1000 times faster than the calculation speed of the existing relay computer at that time.

On February 15, 1946, the US government held a grand unveiling ceremony for ENIAC.

At the ceremony, ENIAC performed publicly and won thunderous applause.

Moziri and Eckert were praised by all sectors of society.

They also patented electronic computers.

Interestingly, there was a lawsuit later.

Originally, atanasov still paid attention to the cause of electronic computer after interrupting the development of electronic computer.

After ENIAC came out, he found the designer’s design.