When sending a telegram, the electric key connects or disconnects the circuit, and the information is transmitted in the form of "dots" and "dashes". It takes 0.1 seconds to make a “dot” and 0.3 seconds to make a “dash”.
In this case, there are only two states of the electrical signal: there is current when the key is pressed, and there is no current when the key is not pressed. pressed. When there is current, it is called a mark, represented by the number “1”; when there is no current, it is called a blank signal, represented by the number "0". A “dot” is represented by “1, 0” and a “stroke” is represented by “1, 1, 1, 0”.
Morse telegraphy uses “dots and dashes” in different sequences to represent letters or numbers to be transmitted. It's Morse code. The actual speed at which the Morse telegraph operated was very low, no more than 20 dot signals per seconde. In order to increase the speed of sending telegrams, telex devices are now commonly used.
Detailed information:
In the early 20th century, even ordinary people could afford to use telegraphs for long-distance communications. At that time, the company responsible for operating telegraphic communications set up telegraph offices in major cities. Ordinary people could send a telegram to another distant city provided they paid at the telegraph office. Fees are calculated based on the distance and number of words contained in the telegram.
When the telegraph office at the other end receives the telegram, a dedicated person will deliver the printed telegram to the destination. As for most large businesses and governments, they have their own telegraph lines. With the popularity of telegraphs, organizationsspecialized in transmitting information by telegraph sprang up in various places, now known as news agencies. Among them, Reuters was founded in London in 1851 and was one of the first news agencies.
Reference materials:
Baidu Encyclopedia-Telegram