Early telegrams could only transmit one message at a time, but could not exchange signals at the same time. Because Edison himself was a telegraph technician, he began to improve the traditional telegraph and made a double telegraph. 1874, he developed a quadruple telegraph, which is also a synchronous telegraph. At that time, before the development of radio, synchronous transmitter was a major breakthrough.
(2) improve the telephone
As we all know, the modern telephone was invented by Bell. In fact, the telephone can send and receive clearly, thanks to Edison's repeated experiments, which broke through the traditional pattern and made a toner transmitter, which improved the sensitivity, volume and receiving distance of the telephone in one fell swoop. Otherwise, you will often say hello when you call now! Hey! I can't hear you. I can't hear you clearly.
(3) the phonograph
1877 One night in February, the staff of Mengluoyuan Laboratory trembled slightly, not because of the cold, but because they heard the phonograph leave a sound for the first time. This great invention needs no more introduction, and everyone can understand how wide its application is. The French government also awarded Sir Edison the title! Later, Edison made many improvements to the phonograph until the drum was changed to a bakelite turntable. This is not a year or two, but after decades of continuous improvement!
(4) Electric lamp-the messenger of light
/kloc-at the beginning of the 0/9th century, people began to use gas lamps, but gas was supplied by pipelines. Once it leaks or is blocked, it is very prone to accidents, and people are very eager for the reform of lighting. In fact, Edison set himself an impossible task: in addition to improving lighting, he must also create a power supply system.
So he and his partners in Luomeng Garden made more than 600 experiments on heat-resistant materials and more than 600 kinds of plant fibers 1600 times before they made the first carbon filament light bulb, which can burn for 45 hours at a time. Later, he constantly improved the manufacturing method on this basis, and finally introduced a bamboo filament light bulb that can ignite 1200 hours.
In the mid-1980s, Edison's electric light career was successful, which brought him a greater reputation than any previous achievements. Before the mid-1980s, he seldom made mistakes. After that, despite his great achievements, failures are common. One of Edison's most commendable behaviors is that he criticized alternating current, saying that alternating current has side effects and may cause death and injury, but he did not specify. Therefore, some people say, "It is very contradictory for a person like him who has made many inventions to attack other people's new inventions. "He opposed the use of alternating current in favor of direct current, so he lost in a fierce and stubborn argument. On the one hand, it reflects Edison's stubborn and old-fashioned shortcomings after he became famous.
(5) Copying machine
At first, Edison invented paraffin paper, which was only widely used as packaging material for food and candy. Later, he tried to carve the outline of the words on wax paper to form a wax lettering paper tray, put white paper under the paper tray, and then rolled it off the wax lettering paper with an ink roller. A wonderful thing happened, and clear handwriting appeared on the white paper. Later, after many improvement experiments, Edison began to mass-produce the copier he invented at 1876, and all of a sudden, institutions, schools, institutions and organizations adopted this template mimeograph. Because Edison's copier is very popular all over the world, Edison deeply realized that he should invent things that people generally and deeply need.