Tham khảo tài liệu 'tiếng anh chuyên ngành học viện công nghệ bưu chính viễn thông phần 5', ngoại ngữ, anh văn thương mại phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Unit 5. Telephone Exchanges medicine and energy supply for example. Telecommunications was important for the development of all these other technologies because using telecommunications we can send and receive the lifeblood of modern society - information. All we have to do is flick a switch or turn a dial. The telecommunications story starts with the electric telegraph. Today the telegraph seems a simple piece of technology. But 150 years ago it was a great innovation. When the first telegraphs appeared the fastest way of travelling was by rail. Train accidents were very common because nobody could communicate with the drivers of moving trains. Then telegraphs were used to send messages down the line to tell the drivers when it was safe to go and when they had to stop and wait. At first the owners of the railways did not want to use the new technology because they said it was too expensive but in the end they had to in order to improve safety. Soon the owners of newspapers became interested in telegraphy and it became a worldwide success. At first telephones were not popular either. There were so few of them that there was no point in having one as the number of subscribers was so small. Besides servants or messengers could be employed to take messages for less than the cost of a telephone. Now after more than a century there are about 28 million telephones in Great Britain with a population of 56 million. People usually resist new technology. Then little by little they begin to accept it. Slow acceptance means that there is time for technical improvements to be made. This leads to a better product at a lower cost. So more and more people want the new product. Finally there is rapid change in the technology itself and in the community that uses it. Telecommunications has developed in this way. In the beginning the telegraph and the telephone were interesting novelties. Then they became necessary to everyday life. Now telecommunications is a major industry which .
