电话的发明英语作文

the telephone is one of the most welcome and useful inventions. no wonder more and more families have got to use their own telephones today.

the telephone makes things easy in many ways. especially, after the mobile telephone appears, communication becomes easier and rapider. to students and people going out for business far away from their homes, the telephone can shorten the distance between them and their families. thus they will get comfort whenever they are homesick or they run into trouble. with the help of the telephone, people can keep in touch with anyone at any time and in any place for urgent help.

all in all, the telephone is so helpful that we can say that nowadays we can not live without the telephone in our daily life. we will further improve the performance of the telephone so as to create better conditions for its development.

mobile phones, also known as mobile phones, mobile phones can be hold in my hand. early because they more commonly known as the great mobile, at present has developed to the 4 g era. in april 1973, the american engineering technicians "martin cooper invented the first in the world to the civil mobile phones, " martin cooper "from now on, also known as the modern " father "of mobile phones. until now, the mobile phone become a very important tool in people life, and like a swiss army knife is versatile.

today,the phone into the tens of thousands of households,do you know who invented the telephone?

who is the inventor of the telephone.he was born in the uk in 1847,when young,with his father in deaf education,had wanted to make a kind of let the deaf use the eyes to see the sound machine.

the united states became professor of boston university baer,began to study in the same line to transmit many telegraph device -- multiple telegraph,and germination using current to the human voice is transmitted to the remote idea,make numerous hills and streams are separated by people like to talk face to face.then,baer began a phone research.

it was in june 2,1875,baer and his assistant watson respectively in the two room test multiple telegraph,an accidental incidents inspired baer.watson room telegraph has a spring stick to the magnet,watson opened the spring,spring has vibration.at the same time,baer was surprised to find his room telegraph machine on the spring vibration,also makes a sound,is the current vibration from one room to another room.baer's idea was wide open,he thus think:if people on the piece of iron to iron,sound will cause vibration; if the iron is placed behind a piece of magnet,iron sheet vibration inevitably in the electromagnet coil to generate big small current.the fluctuation of current along the wire to the distant,distant similar device does not happen the same vibration,do the same thing?that sound along the wire spread far away.this is not the dream of phone!

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