Wired telegraph was successfully set up in the laboratory in 1835 by an American (S.F.B.Morse) after painstaking research. 1837, morse set up a 5 18 meter long wire in the conference room of new york university, and the telegraph was born.

2. Wireless telegraph

The wireless telegraph was invented by Marconi in 1895. At that time, he first realized long-distance wireless communication by wireless telegraph. The public realized that the distance of Marconi wireless telegraph test was 3320 kilometers.

Extended data

The first telegraph line in China was the submarine cable laid by Britain, Russia and Denmark in187/kloc-0, from Hongkong to Nagasaki. Due to the opposition of the Qing government, cables were banned from landing in Shanghai.

Later, the Danish company did not understand the government's ban, led the line to the Shanghai concession, and began to send and receive telegrams on June 3. As for the first self-laid line, it was built by Ding Richang, Governor of Fujian Province, in Taiwan Province Province, and was completed in June 1877, connecting Tainan and Kaohsiung.

From 65438 to 0879, Li Hongzhang, Minister of Beiyang, set up telegraph lines between Tianjin, Dagu and Beitang for military communication. 1880, Sino-Russian Ili negotiated, and the relationship between the two countries was tense. Li Hongzhang was granted permission to set up a general telegraph office on the grounds of "using troops quickly and expensively", with Sheng Xuanhuai as the general manager. The telegraph service from Tianjin to Shanghai was opened in 188 1 65438+February.