The history of telephone

1On June 2nd, 875, the telephone was invented by American Bell Arikan Del Graham. Today, there is still a bronze medal at the gate of Court Road 109 in Boston, USA, which reads: 1875 Telephone was born here on June 2nd.

1On March 7th, 876, Bei obtained a patent for the invention of telephone, with the patent number: 174655. On April 4th, the first personal telephone was installed between Charles Williams' office in Boston and his home in Massachusetts.

1877 may 17, Edwin Homais of Boston burglar alarm shop used the telephone switchboard system for the first time, and five branch lines were connected to five offices equipped with burglar alarm bells.

1878 65438+1On October 28th, the first local telephone exchange was opened in Newhorn, Connecticut, USA, with only 20 users at that time.

1 September, 8781day, Emma M. Nate became the first female operator in the world. From 1878 to 1879, Bell set up a 300-kilometer long-distance telephone line from Boston to new york. But the volume is very low.

1879, Edison made a carbon microphone by electromagnetic effect, which significantly improved the effect of sending information. The principle and device of Edison's carbon microphone have been used to this day.

At the end of 1879, the phone number appears. It was put forward by a physician inspired by the measles epidemic in Massachusetts, because once the operator gets sick, the telephone in the whole city will not be paralyzed.

188 1 year, British electrical technician Pi Xiaopu set up a pair of open-air telephones along the street in Shanghai Shiliupu, paying 36 francs for one call. This is China's first telephone.

188 1 year, Rome, Italy, Paris, France and Berlin, Germany successively opened the first telephone network. 1882, and the telephone line is twisted pair. This is the result of the paper on overhead line interference published by British professor Hughes in 1879.

1882 In February, Danish Dabei Telegraph Company set up the first telephone office in China on Yangyutian Road, Shanghai Bund, with 25 users. In the summer of the same year, Pi Xiaopu opened the second telephone office in the name of "Shanghai Telephone Mutual Assistance Association", with more than 30 users. At the end of the year, the British company "Toyo Telephone" merged the above two telephone offices, and there were still only over 300 users. Later it was taken over by the Ministry of Industry and Information Technology.

1 may, 8841day, the world's first skyscraper real estate insurance company 10 floor was completed in Chicago. It is the telephone that makes skyscrapers appear one after another in big cities. Because if there is no telephone, the information in the building must be transmitted manually, so the elevator used by the correspondent is far from enough.

On May 1889, William Grader invented the pay phone in Hartford, Connecticut. Soon, a telephone booth appeared in the street.

1889 (the 25th year of Guangxu), Peng Mingbao, a well-known alternate in Anqing, Anhui, designed and manufactured 50 or 60 kinds of parts of different sizes and made a "competitive telephone", which made people proud and shocked China and foreign countries.