Graham Bell was born in Edinburgh, Scotland, on March 3, 1847.

His father and grandfather were both scholars of acoustics.

His father even tried to teach the deaf to speak.

Due to the influence of family environment, bell sympathized with the deaf mute from an early age and had a strong interest in phonetics.

Bell entered the University of Edinburgh at the age of 17.

He chose phonetics as his major.

After graduation, he became a teacher in the school for the deaf.

During this period, together with his father, he devoted himself to studying how to make the deaf mute speak.

The noble behavior of the father and son was praised by the local people.

However, an unexpected situation happened.

Baer’s two brothers died of tuberculosis in succession, and Baer’s health was also seriously threatened.

At that time, specific drugs for the treatment of lung disease had not yet come out, and the local climate was very unfavorable to the rehabilitation of patients.

As a last resort, the family moved to Canada in 1870.

After moving to Canada, Bell’s health improved day by day.

In 1873, bell moved to the United States and became a professor of physiology at Boston University.

He continued to engage in the education of the deaf mute.

During this period, he fell in love with a deaf mute student, which made him more committed to his research work.

According to the theory obtained from the study of human ear and human voice, bell wanted to make a compound telegraph, that is, send several telegrams with different frequencies at the same time without disturbing each other on the same telegraph.

Bell carried out the experiment on the basis of Morse sending signal.

A young man named Thomas Watson also joined the experiment and became a right-hand man.

Once, when they were doing the test of the compound telegraph, due to the failure of the parts, bell accidentally found that an iron plate on the telegraph was constantly vibrating in front of the electromagnet and made a weak sound, which could be transmitted to a distance through the wire.

The discovery excited bell.

He boldly thought: if the vibration of sound wave can be converted into fluctuating current, the current can be converted into the same sound wave as the original sound at the other end of the circuit.

In this way, the sound can be carried on the wire at the speed of light and transmitted to any party in the distance? Bell’s idea was praised by Joseph Henry, a famous American physicist at that time.

He encouraged bell to say, “you have an idea of a great invention, do it!” In this way, bell changed his research direction.

While learning electrical knowledge, he began to design and make telephones.

Bell and his assistant Watson readjusted each vibrator, made a transmitter and receiver in their respective rooms, connected the wires to it, and began the experiment of transmitting electricity.

But despite their hoarse cries, the machine can only make an extremely weak sound, which can’t be heard at all.

Is the design wrong? Or is it wrong? Maybe electricity transmission itself is impossible? While bell was thinking hard about the failure of the experiment, the sound of guitar outside the window caught his attention.

He listened attentively.

Suddenly, he thought that the sensitivity of the transmitter and receiver was too low, so the sound was weak and difficult to distinguish.

Bell thought that if he used the sound box to resonate like a guitar, he would be able to hear the sound.

The two inventors were so excited that they began to make speakers with bed boards overnight.

Then, they constantly modified the experimental device, carefully checked it again, and then went back to their own room to start the experiment.

At this time, bell accidentally knocked over the acidic solution on the table and sprinkled the solution on the suit.

Frustrated that he had no money to buy new clothes, he shouted, “Watson, please come here, I need you!” Unexpectedly, this common word for help has become the first human voice transmitted by electricity in the world.

Watson was surprised to hear Bell’s voice from the wire in his room.

He was so surprised that he repeatedly called Bell’s name: “bell! Bell! I heard it! I heard it!” They were overjoyed.

They opened the door and ran to each other.

They hugged and shouted loudly, “the phone succeeded!” History recorded this unforgettable moment: March 10, 1876.

Bell was 29 and Watson was 20.

That night, bell wrote to his mother: “in the near future, telephone lines will be installed in every family like water pipes and gas pipes, and friends can talk to each other in their own homes.

” That year, bell obtained the telephone patent and established the first telephone company.

This year, in order to celebrate the centenary of the declaration of independence, the United States held an unprecedented Centennial Exhibition in Philadelphia.

Bell showed his masterpiece at the exhibition, which attracted the attention of thousands of people, and bell became famous at one fell swoop.

At that time, the visiting Brazilian emperor Pedro II was particularly impressed by Bell’s invention of the telephone.

He lingered for a long time in front of this machine that looks simple and rough today.

When he put down the microphone, he said, “it can speak!” The matter made headlines in many newspapers the next day.

The telephone was introduced into American society almost immediately.

But the telephone originally invented by Bell didn’t sound very clear and didn’t talk far.

Later, the invention of carbon powder transmitter, the single iron wire for voice transmission was changed to double copper wire, the quality of the transmitter was improved, the call distance was increased, and the application scope of the telephone was expanded.

By the early 20th century, European countries had set up telephone offices, and telephone lines like spider webs could be seen over major cities.

The telephone has brought unprecedented convenience to the world’s economy, commerce, culture and other undertakings.

People can use the telephone to convey information and get in touch, which greatly saves manpower and time and improves work efficiency.

After Bell invented the telephone, he continued to engage in his invention and improved his phonograph.

In 1881, bell dramatically invented the metal locator in order to find the bullet in the body of President gaffer who was stabbed and dying.

The instrument later proved to be of good performance.

The invention of the telephone brought great wealth to bell.

He built a summer house in Nova Scotia, where he worked and rested.

In 1883, bell founded the American journal Science.

Bell is also very interested in Aeronautics and is also engaged in experiments on air conditioning and even animal reproduction.

The honors he won in his life are numerous.

In 1915, when the first telephone line across the continental United States was opened, bell came backOn the phone with his former assistant Watson.

As 40 years ago, bell shouted excitedly, “Watson! Please come here, I need you!” This time, this sentence does not pass from one room to another, but from the east coast to the west coast.

Bell died at the age of 75 on August 2, 1922.

In 1950, bell was selected as a member of the American great man Memorial, 10 years before Edison.

The world’s first telephone invented by him, as a major scientific achievement that has made outstanding contributions to human progress, is now stored in the American History Museum.