How many kinds of things did Edison invent? What are they?

Edison had more than 2,000 inventions in his life and held more than 1000 patents. More importantly, electric lights, trams, movies, generators, motors, telephones, phonographs and so on.

First of all, the 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.

Second, the 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.

/kloc-in August of 0/5, Edison asked his assistant to make a "strange machine" consisting of a large cylinder, a crank, a receiver and a diaphragm according to the pattern. After the production, Edison took out a piece of tin foil and rolled it on a metal cylinder engraved with spiral grooves, so that one end of the needle gently rubbed the tin foil and the other end was connected with the receiver.

Then Edison shook the handle, sang into the receiver, put the needle back, shook the handle again, and then the machine played back Edison's voice. In February 65438, Edison publicly demonstrated this "tin foil cylinder phonograph", which caused a sensation all over the world.

Three. Movable film camera

1889 Edison invented the movable film camera. This camera uses a pointed gear to drive the tape with the width of 19mm. Under the control of the ratchet, it drives the tape to move intermittently and punch holes at the same time. This camera is driven by a motor, and the shutter shaft is connected to the phonograph. When the camera is running, the phonograph records sound and can take pictures continuously. ?

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. ?

Verb (abbreviation for verb) sound film

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.

Baidu Encyclopedia-Thomas Alva Edison