Edison's four great inventions

Edison's four great inventions include the electric light, the phonograph, the talking film and the film projector.

1, 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.

2, phonograph

1877, Edison found that the diaphragm in the telephone transmitter would vibrate with the voice of speech, so he took a short needle and did an experiment, from which he was greatly inspired. Speech speed can make the short needle vibrate accordingly. On the other hand, this kind of vibration will definitely make the original sound, so he began to study the problem of sound reproduction.

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.

4. Movable film projector

189 1 year, Edison invented the movable film projector, which is an early film projection equipment, and introduced the basic methods of film projection. The motor is used in front of the light source to make the film belt of continuous pictures rotate at high speed, thus creating the illusion of motion. The light source projects the pictures on the film onto the screen.

Extended data

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 experiment by himself, but also has unlimited energy and courage to work hard beyond ordinary people.

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.

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