Edison's three great inventions

Edison's three great inventions were the phonograph, the movie camera and the electric light.

1, phonograph

Edison's first great invention in Menlo Park was the tin foil cylinder phonograph. At that time, he was trying to improve the working efficiency of the transmitter. Suddenly, he found that when the machine was running at high speed, the tape of the transmitter would make a sound similar to human speech. This discovery made him very curious and wondered if he could record telephone messages.

So, he began to experiment with the vibrating membrane on the receiver and connected a needle to the membrane. He concluded that the needle could be recorded on paper tape. Later, he tried to stick a needle in the tin foil tube with an iron pen. As a result, he was surprised to find that a recorded message-"Mary has a lamb" was actually played back.

2. electric light

Contrary to popular understanding, Edison was not the inventor of electric light at first, but Edison improved it. As early as 180 1 year, a British chemist named humphry davy used platinum wire to electrify and glow in the laboratory.

18 10, he invented the "electric candle" which was illuminated by the arc between two charged carbon rods, which was the earliest prototype of the electric lamp. Joseph swan, another British electrical engineer, after nearly 30 years' research, made a vacuum bulb with electricity and light from carbon wire in 1878+02.

3. Audio movies

19 10, Edison invented a movie camera consisting of a phonograph and a camera. Under the energy of the motor, the camera's shading crankshaft is linked with the phonograph, which can record when the camera is running. During the screening, the phonograph runs synchronously with the picture, so that sound and image appear at the same time.

Extended data

Personality assessment

Hoover, the 3rd1President of the United States: "He is a great inventor and a benefactor of mankind."

Facing everything around him calmly and facing life optimistically until death is Edison's attitude all his life.

Edison's cultural level is extremely low, but his contribution to mankind is so great. Edison not only has a curious heart and an instinct to try by himself, but also has unlimited energy and courage beyond ordinary people to work hard.

Edison made so many inventions in his 84-year life, and he has been persistently devoted to inventions. In addition to his inventions and contributions in phonograph, electric light, telephone, telegraph and film, he also has many creations and opinions in mining, architecture and chemical industry, and has made great contributions to the progress of human civilization.

Baidu Encyclopedia-Thomas Alva Edison