The Internet originated in the Pentagon.
Its predecessor was the Advanced Research Projects Agency of the US Department of Defense.
The inventor of the telegraph was Morse, 179 1 was born in Charlestown, Massachusetts on April 27th. He loves painting and co-founded Business Daily (new york). 1826- 1845 served as the first president of the national painting academy. During the period of 1832, the idea of creating telegrams came into being after listening to others talking about the newly discovered electromagnetic lessons. 1838, he formulated the dotted line system, which later became the general Morse code. 1854, the American court confirmed his patent right. Since then, his reputation has grown bigger and bigger, and his wealth has greatly increased. Engaged in charity in his later years. 1872 died on April 2nd.
The inventor of the telephone was alexander bell, an Englishman. Bell was born into an acoustic family in England and later moved to America. In Boston, a school has increased the number of deaf teachers. For professional reasons, he studied the physiological functions of listening and speaking. Later, he was hired as a professor of sound physiology at Boston University. 1873 resigned as a professor and began to concentrate on the research and development of telephones. To develop the telephone, we must first turn the sound signal into an electrical signal, and then turn the electrical signal into a sound signal. Before Bell, many people had been studying this problem. 1875, Bell was inspired by the application of electromagnets in telegraphy, which can convert electrical signals and mechanical movements. Bell began to design electromagnetic telephones. He first put a tuning fork in front of a coil with an iron core. The vibration of the tuning fork causes the iron core to move correspondingly, resulting in induced current. The current signal is transmitted to the other end of the wire and converted into a sound signal. Later, Bell changed the tuning fork into a metal piece that can vibrate with the sound, and changed the iron core into a magnetic rod. After repeated experiments, a practical telephone device was made. 1876, Bell obtained the telephone patent in the United States. He not only invented the telephone, but also established the first telephone company in the world.
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 the Daily Telegraph of 65438+February 1 Sunday, it is well known that Alexander Graham Bell, who was born in Scotland and later immigrated to the United States, was the inventor of the world's first telephone, and he was awarded the title of "the father of the telephone". However, the latest declassified documents reveal that the inventor of the world's first telephone was not Bell at all, but a German science teacher named Philip Rice. The British telephone company discovered the secret 50 years ago, but kept it secret for commercial interests. According to John Li Fen, curator of the London Science Museum, he found the secret in the old documents of the museum. Newly discovered documents show that as early as 1947, shortly after the end of World War II, engineers of Standard Telephone and Telegraph Company (stc) tested a series of ancient telephones, some of which were invented long before Bell, the "father of telephone", invented the first telephone. The experimental results show that a telephone device invented by German science teacher Philip Rice can be used completely, and this kind of telephone was invented in 1863, and the first telephone in Bibel came out 13 years earlier. Scientists have found that although the sound transmitted by this mobile phone is very weak, it can work. Therefore, the earliest inventor of the telephone was neither Bell nor Edison!
Ordinary people mainly rely on passers-by, monks, literati and other people who travel around the world to deliver letters. These people can solve the problem of accommodation on the way, and they are willing to do so!
The official is mainly the post office.
Transmit military information:
The army must have full-time personnel in this field, as well as beacon towers and homing pigeons.
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The accuracy of carrier pigeons is low, most of them are letters, but it takes several months. There are also 100 Li Express, 200 Li Express and 300 Li Express on horseback, but they are all very expensive. Generally, this kind of "express delivery" is mostly used for official letters.
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There are also military means such as bonfires/wolf smoke.
You can use a torch.
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The ancient methods of transmitting information are as follows:
[1] Feather stick: Feather letters are mostly used in war emergencies.
[2] Chicken hair letter: generally used in folk.
[3] Feather book: used for conscription.
[4] Pigeons send books [so-called flying pigeons send books]
[5] Fast horses pass books.
[6] Bamboo tube: dual-purpose for government and people, similar to the current envelope.
[7] Rapid transmission: used to transmit urgent military information, commonly known as "passing the gold medal".
[8] Different dynasties, such as bonfires/wolf smoke, have different modes of transmission. 4. Telephone, computer, mail, letter, fax, email, mobile phone, walkie-talkie, advertisement, message, advertisement, newspaper, leaflet, TV station and radio station. . . . . . . . . Words, gestures, eyes and ears. . . . . |