Inventor King Edison, what are the three most famous inventions?

Edison's three major inventions are: the phonograph, the movie camera, and the electric light.

1. Phonograph

Edison’s first great invention in Menlo Park was the tinfoil cylinder phonograph. At that time, he was trying to improve the working efficiency of the transmitter, and suddenly he discovered that when the machine was running at high speed, the belt of the transmitter would make a noise similar to human speech. This discovery made him very curious and wanted to know if it was possible to record a phone call.

So he began to experiment with the vibrating membrane on the earpiece and connected a needle to the membrane. He theorized that the needle could be used to record audio by tying it on paper tape. Later, he tried using a stylus to poke a needle into the tinfoil tube, and was surprised to find that a short recorded message - "Mary Had a Little Lamb" - was played back.

2. Electric light

Contrary to people's common understanding, Edison was not the original inventor of the electric light. Edison improved the electric light. As early as 1801, a British chemist named Humphry Davy used platinum wire to generate electricity in the laboratory.

In 1810, he invented the "electric candle" that was illuminated by the arc generated between two energized carbon rods. This was considered the earliest prototype of the electric light. After nearly 30 years of research, another British electrical engineer, Joseph Swan, made a vacuum light bulb that used carbon filaments to energize and emit light in December 1878.

3. Talking movies

In 1910, Edison invented a movie camera that was a combination of a phonograph and a video camera. Under the power of the motor, the light-shielding crankshaft of the camera was linked to the phonograph. , the gramophone can record sound while the camera is running. During the screening, the gramophone runs synchronously with the picture, allowing sound and images to appear at the same time.

Extended information

Character evaluation

Hoover, the 31st President of the United States: "He is a great inventor and a benefactor of mankind."< /p>

Facing everything around him calmly and being optimistic about life until death, this was Edison's lifelong attitude.

Edison had a very low level of education, but his contribution to mankind was so huge. In addition to having a curious heart and an instinct for personal experimentation, he also had infinite energy and hard work that was beyond ordinary people. Courageous spirit.

Edison made so many inventions in his 84 years of life, and he was always persistent and dedicated to inventions. In addition to his inventions and contributions in phonographs, electric lights, telephones, telegraphs, movies, etc., he also made great contributions to mining, There are also many creations and insights in the construction industry, chemical industry and other fields. He has made great contributions to human civilization and progress.

Baidu Encyclopedia-Thomas Alva Edison