1. The Internet is also called the Internet, the World Wide Web, and the ARPANET
The Internet originated from the Pentagon in the United States
Its predecessor was the U.S. Defense Advanced Research Projects Agency
2. The inventor of the telegraph was Morse, who was born on April 27, 1791 in Charlestown, Massachusetts. He loves painting and co-founded the Business Journal (New York). From 1826 to 1845, he served as the first director of the National Academy of Painting. In 1832, while listening to others talking about the newly discovered electromagnetism, he came up with the idea of ????creating the telegraph. In 1838, he developed the dot-line system, which became the Morse code that became popular around the world. In 1854, a U.S. court confirmed his patent rights. From then on, his reputation grew and his wealth increased greatly. Engaged in philanthropy in his later years. Died of illness on April 2, 1872.
The inventor of the telephone was British Alexander Bell. Bell was born into an acoustic family in England and later immigrated to the United States. A school for deaf-mute teachers was opened in Boston. For professional reasons, he studied the physiological functions of listening and speaking. He was later hired as a professor of sound physiology at Boston University. In 1873, he resigned as a professor and began to concentrate on developing telephones. To develop a telephone, you must first turn the sound signal into an electrical signal, and then turn the electrical signal into an acoustic signal. Before Bell, many people were already studying this problem. In 1875, Bell saw at work that electromagnets that could convert electrical signals into mechanical motion were used in telegraph machines, which inspired him. Bell began designing an electromagnetic telephone. He initially placed a tuning fork in front of a coil with an iron core. The vibration of the tuning fork caused the iron core to move accordingly, generating an induced current. The current signal was transmitted to the other end of the wire and converted into an acoustic signal. Later, Bell changed the tuning fork to one that could be adjusted at any time. He used a metal piece that vibrated with sound and changed the iron core into a magnetic rod. After repeated experiments, he made a practical telephone device. In 1876, Bell obtained the U.S. telephone patent. He not only invented the telephone, but also established the world's first telephone company.
There is also a saying that
The "father of the telephone" is not Bell, who has always been recognized as the "father of the telephone." Xinhua/AP According to "Daily Telegraph" ” reported on December 1 that as we all know, Alexander Graham Bell, who was originally from Scotland and later immigrated to the United States, was the inventor of the world’s first telephone. He also earned the title of “Father of the Telephone.” However, the latest decryption. Documents revealed that the inventor of the world's first telephone was not Bell at all, but a German science teacher named Philip Reis. The British Telephone Company discovered this secret 50 years ago, but for commercial reasons. The interest has remained tight-lipped. According to John Liffin, director of the Science Museum in London, he discovered the secret in a pile of old papers in the museum. Newly discovered documents show that as early as 1947, shortly after the end of World War II, in order to calm down the "phone." "Father of the Telephone" debate, engineers from the British Standard Telephone and Telegraph Company (stc) tested a series of ancient telephones, some of which were invented long before Bell, the "father of the telephone," invented the first telephone. The experimental results show that a telephone device invented by German science teacher Philip Reiss was fully usable. This telephone was invented in 1863, 13 years before Bell's first telephone. They found that although the voice transmitted by this telephone was very weak, it could work. Therefore, the earliest inventor of the telephone was not Bell or Edison!
3. Ordinary civilians mainly rely on passing letters. People, monks, literati and other wandering people sent messages that they could solve the problem of food and accommodation during the journey, and they were very willing!
The official place is mainly a inn.
Conveying military information:
The army must have full-time personnel in this area, as well as beacon towers and carrier pigeons.
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The accuracy of pigeon delivery is low. Most of them are letters, but they take a long time in months. There are also 100-mile express, 200-mile express, and 300-mile express on horseback. But It costs a lot of money, and generally this kind of "express delivery" is mostly used for official correspondence.
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There are also military means such as beacon fire/wolf smoke
You can use torches
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The ancients used roughly the following methods to convey information:
[1] Feather letter: Letters with feathers inserted were mostly used for war emergencies.
[2]Ji Fei Xin: Generally used among the people.
[3] Yu Shu: Used to recruit troops.
[4] The messenger pigeon delivers the message [the so-called flying pigeon delivers the message]
[5] The fast horse delivers the message.
[6] Bamboo tube: used by both officials and private citizens, similar to current envelopes.
[7] Urgent delivery: used to deliver urgent military information, commonly known as "passing gold medals".
[8] Different dynasties such as beacon fire/wolf smoke have different transmission methods. 4. Telephone, computer, email, letter, fax, mailbox, mobile phone, walkie-talkie, advertising, sending a message, posting an advertisement, posting in a newspaper, handing out leaflets, TV station, radio, etc. . . . . . . . . Language, gestures, and eyes are in sync. . . . . |