Question 2: Who invented the telegraph ~ When was it invented? Bell, Morse 65438+In the 1930s, due to the rapid development of railways, there was an urgent need for a communication tool that was not affected by the weather, had no time limit and ran faster than the train. At this time, the basic technical conditions for the invention of telegraph (battery, copper wire, electromagnetic inductor) have also been met. 1837, the first wired telegraph was designed and manufactured by Cook and Wheatstone in Britain, and it was continuously improved, and the speed of sending telegrams was continuously improved. This kind of telegram was quickly applied in railway communication. The characteristic of their telegraph system is that messages point directly to letters. At the same time, American Morse was fascinated by the telegraph. He is a painter. With his rich imagination and indomitable spirit of struggle, he realized many people's dreams. At the age of 4, he returned to the United States by boat after studying painting in France, and Dr. Jackson introduced him to the magical electromagnetic world. On the boat, Jackson showed him an electromagnet, which is a device that attracts iron with electric energy. When the power is cut off, the iron will fall. It is also said that no matter how long the wire is, the current can pass quickly. This gadget made Morse daydream: Since current can pass through wires instantly, can it be used to transmit information? To this end, he wrote down the words telegraph in his picture book, determined to complete the invention of transmitting information by electricity. After returning to America, he devoted himself wholeheartedly to the development of telegraph. He studied electromagnetism from the beginning and studied under the famous electromagnetist Henry. He bought all kinds of experimental instruments and power tools, turned the studio into a laboratory and worked day and night. He designed one scheme after another, drew another sketch, tried again and again, but failed again and again. In deep disappointment, he tried to return to his old job several times. However, every time he picked up the brush and saw the words "write a telegram by himself" on the picture book, he was encouraged by his oath and looked up from disappointment. He calmly analyzed the reasons for the failure, carefully examined the design ideas, and found that new methods must be found to send signals. 1836, morse finally found a new method. He wrote down a new design in his notebook: as long as the current stops for a while, sparks will appear. Spark can be regarded as a symbol, no spark is another symbol, and the length of time without spark is another symbol. These three symbols can be combined to represent letters and numbers, so that words can be transmitted through wires. How simple we look now! But Morse was the first person in the world to think about how difficult it is to represent letters with a combination of dots, dashes and spaces. How great and strange the idea of transmitting information through coding is! In this way, as long as two kinds of electrical symbols are issued, information can be transmitted, which greatly simplifies the design and devices. Morse's peculiar idea, the famous Morse code, is the earliest code in the history of telecommunications and a major breakthrough in the history of telegraph invention. After the breakthrough, Morse immediately threw himself into intense work, turned his ideas into practical devices, and constantly improved them. 1844 May 24th is a glorious page in the world telecommunication history. Morse himself pressed the telegraph button in the lobby of the US Congress. With a series of clicks, the news quickly spread to Baltimore, dozens of kilometers away. His assistant translated the message accurately. The success of Morse's telegraph sensationalized the United States, Britain and other countries in the world, and his telegraph soon became popular all over the world. /kloc-morse telegraph machine was widely used in the second half of the 9th century.
Question 3: When was the wireless telegraph invented? 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.
Question 4: When was the wireless telegraph invented? People all over the world think that Italian physicist and engineer Marconi is the inventor of radio. However, many citizens of the former Soviet Union firmly believe that the real inventor of radio is popov, a physics professor at Kranstadt Institute of Marine Engineering in Petersburg, Russia. The two men carried out the experiment and assembly of radio reception from 1895 to 1896. However, it was Marconi of Italy who applied for a patent for his Morse signal transmission equipment for the first time on June 2, 1996. A few months later, he obtained the patent right and won the Nobel Prize in Physics with 1909. After that, he set up a company named after himself. Popov demonstrated his radio receiver on May 7th, 1895. However, when his receiver receives the Morse signal, the interference is greater than the signal. However, Russians commemorate popov's Radio Invention Day on May 7th every year. Although popov knew that Marconi had obtained the patent, he continued his experiment and never argued with the Italian, the first inventor of this patent. Not only that, they also made friends with each other at 1902. According to Marconi's biography, he invented the radio by doing experiments in his father's attic. Because Marconi was fascinated by the study of sending signals into the air through electromagnetic waves, he designed a simple device, which later completely changed the whole communication world. Using this electromagnetic wave transmitter, the antenna invented by popov and the metal detector invented by Bradley, he successfully carried out the first long-distance signal propagation. After Marconi realized that Italy had neglected his experiment, Marconi, who was full of confidence in his invention, moved to England. He established his first company in 1897; Wireless telegraph and telecommunications co., ltd, later renamed Marconi wireless telegraph co., ltd. Later, Marconi focused on increasing the transmitting power and distance, but he didn't pay enough attention to the tuning between transmitting and receiving equipment. The most important attempt of this great pioneering work was a radio communication between Europe and America in 190 1 year, and the Morse radio signal was successfully received. Three "&; S226 ",letter" S ",with a launch distance of 3,500 kilometers. 1905 After popov died young at the age of 46, the Russian Physical Society demanded that popov be recognized as the inventor of radio. 1925 victor, director of the Soviet weights and measures office? Gabel also asked for more recognition of popov, because according to him, popov sent a signal in Morse code at an annual meeting of the Russian Society of Chemical Physics on May 24th, 1896. Many Russian biographies say that popov was the inventor of radio. Strangely, this statement continues to this day. Ralph, British historian and engineer? Barrett said: "The priority of this invention has been indicated by the patent right 1896. The sample I assembled based on the original device proves that what popov developed has limitations. "
Question 5: Who and when were wireless telegraph and wired telegraph invented respectively? Tel: Bell, 1876 Radio: Nicholas? Tesla, 1897 Telegraph: Cook and Wheatstone, 1837 TV: John? Logie? Baird, 1925 computer: cliff? Berry, 1939 satellite communication: the former Soviet Union, 1957.
Question 6: When did Morse invent the telegraph? 1837, British Cook and Wheatstone invented the first wired telegraph, 1844, Morse invented the telegraph.
Question 7: Who invented the telegraph and the telephone respectively? 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, an Englishman? Bell. 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 American telephone patent. He not only invented the telephone, but also established the first telephone company in the world.