Who invented the light bulb and when was it?

In 1801, Davy, an English chemist, electrified platinum wires. In 1810, he also invented the electric candle, which used an electric arc between two carbon rods for illumination. In 1854, Henri Goebbels used a carbonized bamboo wire and placed it under a vacuum glass bottle to electrify and glow.

His invention today appears to be the first practical electric light. At that time, he experimented with a light bulb that could last for 400 hours, but did not apply for a design patent in time. In 1850, the Englishman Joseph Wilson Swan began working on electric light.

In 1878, he obtained a patent in England for a light bulb powered by carbon filament under vacuum, and began to establish a company in England to install electric light in every home. In 1874, two electrical technicians in Canada applied for a patent for an electric lamp. They are filled with helium under a glass bubble and glow with an electrified carbon rod.

However, they did not have the financial resources to continue developing the invention, so they sold the patent to Edison in 1875. After Edison bought the patent, he tried to improve the filament used. In 1879 he switched to carbon filament to make light bulbs, which lasted for 13 hours.

By 1880, he had built a carbonized bamboo silk bulb that had managed to last for 1,200 hours in the laboratory. But in England, Swan sued Edison for patent infringement and won. Edison's electric light company in England was forced to let Swan join as a partner.

But Swan later sold his rights and patents to Edison. In the United States, Edison's patents were also challenged. The U.S. Patent Office had ruled that his invention was invalid because of its prior convictions.

Finally, after years of lawsuits, Edison obtained the patent rights for the carbon filament lamp.

The light bulb invented by Edison.

The world's first electric light was born on October 21, 1879, and it was invented by American scientist Thomas Edison. Edison began studying electric light in 1879, and the first incandescent substance he chose was white gold, the metal with the highest melting point known at the time. But platinum lamps are too expensive, and when they reach incandescent temperatures, their lifespan is only one or two hours.

Invented by Edison

In 1889, Thomas Edison invented a movable motion picture camera that used a pointed gear rubber to drive a 19 mm wide piece of unperforated tape in a ratchet.

Under the control, the tape is driven to move intermittently while punching holes. The camera is driven by a motor, a light shield shaft and a phonograph.

When the camera is activated, the gramophone records the sound and can take images continuously.

In 1891, Edison invented the movable film projector, which was an early film display device, and introduced the basic method of film projection, by using an engine in front of the light source to rotate the film strip with continuous ** at high speed, thus creating the illusion of activity, and the light source projected the ** on the film onto the screen.

In October 1879, Edison succeeded in making an incandescent lamp with carbon fiber as the filament.

Bubbles, called carbide cotton silk incandescent lamps, were subsequently put into mass production, and companies were established to set up corresponding infrastructure such as power stations and transmission grids, which soon made electric lights commonly used in the United States.

During this period, he continued to improve the technology, and finally decided to use tungsten filament as the filament, called tungsten filament, and finalized it into use today, and Edison has become recognized as the inventor of electric light.

In 1910, Edison invented a film camera composed of a gramophone and a camera, and the blackout crankshaft of the camera was under the energy of the motor.

When linked to a phonograph, the phonograph can record sound while the camera is running. During the projection, the phonograph runs in sync with the picture, so that the sound and image appear at the same time.

The light bulb was invented by Edison.

In October 1879, Edison finally succeeded in making an incandescent light bulb with carbon fiber as the filament, called the "carbonized cotton silk incandescent lamp", and then put it into mass production, and established a company to set up corresponding infrastructure such as power stations and transmission grids.

Soon electric light was widely used in the United States. During this period, he continued to improve the technology, and finally decided to use tungsten filament as the filament, called "tungsten filament", and finalized it into use today, Edison has become recognized as the inventor of the light bulb.

Edison's other inventions:

In 1877, Edison discovered that the diaphragm in the microphone vibrates with the sound of speech, so he experimented with a short needle and got a lot of inspiration from it. The speed of speech can cause the short needle to vibrate accordingly. Then, in turn, this tremor must also produce the original speaking sound, so he began to study the problem of sound reproduction.

On August 15, Edison asked his assistant to make a "strange machine" composed of a large cylinder, a crank, a receiver and a diaphragm, and after making it, Edison took out a piece of tin foil and rolled it into a metal cylinder engraved with a spiral grooved wheel core.

Let one end of the needle gently rub the tin foil and rotate, and the other end is connected to the receiver, then Edison shakes the crank, sings to the receiver, then puts the needle back in place, and then shakes the crank, and then the machine plays Edison's voice back. In December, Edison publicly demonstrated this "tin foil cartridge phonograph", which caused a sensation all over the world.