in teaching the deaf and mute, and had wanted to build a machine that would allow deaf people to see sound with their eyes.
In 1873, Bell, who became a professor at Boston University in the United States, began to study the multiplex telegraph, a device for transmitting many telegrams on the same line
and came up with the idea of utilizing electric current to transmit the sound of a person's voice to a faraway place, so that people who live far away from each other can talk face to face, just as if they were face to face. The idea of using electric current to transmit human speech to distant places so that people thousands of miles away could talk as if they were face to face. So Bell
started research on the telephone.
It was June 2, 1875, and Bell and his assistant Watson were in two separate rooms
experimenting with a multiplex telegraph when a chance accident inspired Bell. A spring on the telegraph
machine in Watson's room had stuck to a magnet, and when Watson pulled the spring apart, it vibrated. At the same time,
Bell was surprised to find that the spring on the telegraph in his room quivered and made a
sound, an electric current that transmitted the vibrations from one room to another. Bell's thoughts were suddenly wide
open, he thus thought: if a person speaks to a piece of iron, the sound will cause the iron to vibrate; if
behind the iron put an electromagnet, the iron's vibration will inevitably be in the electromagnet coils
when the current is large and small. This fluctuating current travels along the wire to a distant location, and wouldn't
the same vibration occur on a similar device at a distance, making the same sound? The sound would then travel along the wire to a faraway place
. Wouldn't that be the dream telephone!
Bell and Watson made the telephone as newly envisioned. During an experiment, a drop of sulfuric acid splashed
on Bell's leg, causing him to scream in pain, "Mr. Watson, I need you, please come to me!"
The words were transmitted from the telephone to Watson's ears via the wire, and the telephone worked.
On March 7, 1876, Bell became the patentee of the invention of the telephone.
Bell was granted 18 patents in his lifetime, and 12 in collaboration with others. He envisioned
burying telephone wires underground, or suspending them in the air, and using them to connect to homes, villages, factories ......
so that direct phone calls could be made from anywhere. Today, Bell's vision has long been a reality.
China's first telephone
All of China at the beginning of the last century, are using foreign imports of telephones, German, Japanese ...... on all sides of the age, is no Chinese-made telephone. And it was at this time, Tianjin, became the pioneer of the national telephone industry. # y. x$ C3 D3 ^4 m O
7 ~7 N& j- D7 w0 \9 Q1 H In the exhibition room of the Tianjin Telephone Equipment Factory, displayed in our country's first hand-cranked magneto telephone, the first artificial magneto telephone exchanges, the first dial automated telephone ...... saw the once Zhongtian Motor Factory as in the days of the sun. + o) M+ f O6 [ H+ `: \
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Early in 1932, intellectual industrialist Zhou Renzhai and fellow student Wang Taidian witnessed the backwardness of China's industry, electromechanical equipment need to be supplied by foreign countries, it was the idea of the founding of the motor factory, the factory named "Zhongtian Motor Factory The name of the factory was "Zhongtian Electric Factory", which means "Tianjin, China", implying that it would manufacture electrical equipment in Tianjin to compete with Siemens products.
; z) W/ B/ W0 T0 K7 P( W1 \7 p* \0 }/ n' N, P! H5 [
0 {7 ^; V+ a. g: ?7 R3 D5 m/ o1 ^; M[China's first telephone produced by the then Zhongtian Electric Factory]