Who invented what?

Edison invented electric light, Hua Tuo invented hemp boiling powder, Roentgen discovered X-ray, Bekkerel discovered spontaneous radioactivity, Rayleigh discovered argon, Darren invented automatic regulator of beacon light, Lawrence invented cyclotron, Glazer invented bubble chamber, Watt invented steam engine, Cai Lun invented paper, Zhang Heng invented seismograph, Bell invented telephone, and so on.

Edison invented the electric light.

1874, two electrical technicians in Canada applied for a patent for electric light: nitrogen was filled under a glass bulb and charged carbon rods were used to emit light, but they did not have enough financial resources to continue to improve this invention, so they sold the patent to Edison in 1875.

Edison tried to improve the filament after purchasing the patent, and finally made a carbonized bamboo filament lamp that could last for 1200 hours in 1880.

However, after the US Patent Office ruled that Edison invented the carbon filament incandescent lamp, the patent was invalid. After years of litigation, Henry Goebbels won the patent, and finally Edison bought the patent from Goebbels poor widow.

In Britain, Swan accused Edison of patent infringement. Later, they settled out of court and set up a joint venture company in Britain on 1883. Swan later sold his shares and patents to Edison.

Second, Watt invented the steam engine.

1764, British instrument repairman james watt noticed this shortcoming when repairing newcomen steam engine model for Glasgow University, and invented a steam engine with condenser separated from cylinder wall in 1765, and obtained a British patent in 1769.

In the early days, Watt's steam engine still used the balance bar and pull rod mechanism to drive the water pump. In order to remove the condensate and air from the condenser, Watt installed an air pump. He also installed an interlayer on the outer wall of the cylinder and heated the cylinder wall with steam to reduce condensation loss.

Watt's creative work made the steam engine develop rapidly. He turned the machine that can only carry water into a widely used steam engine, which doubled the thermal efficiency and greatly reduced the coal consumption. Therefore, Watt is a reformer of steam engine.

Third, Cai Lun invented paper?

When improving papermaking, Cai Lun was responsible for supervising all kinds of utensils used in the palace. He picked out bark, rags, old fishing nets, etc. And let the craftsmen chop them up and soak them in a big pool.

After a period of time, the sundries in it rot, but the fibers are not easy to rot, so they stay. Then he asked the craftsmen to pick up the soaked raw materials, put them in a stone mortar, and kept stirring them until they became slurry.

Then pick up this sticky thing with a bamboo stick, dry it, take it down and turn it into paper. Cai Lun and his craftsmen tried again and again, and produced light, flexible, easily available, widely available and low-priced paper.

In the first year of Yuan Xing (A.D. 105), Cai Lun presented paper to Han and the Emperor, and Cai Lun presented the paper to the Emperor as a memorial, which was appreciated by the Emperor, used and promoted by imperial edicts inside and outside the imperial court, and regarded as a miracle by the imperial court and various government offices all over the country.

Nine years later, Cai Lun was named "Longtinghou" with 300 restaurants. Because the new paper-making method, which was gradually implemented throughout the country, was invented by Cai Lun, people called this kind of paper "Cai Hou Paper".

Fourthly, Zhang Heng invented the seismograph.

During the Eastern Han Dynasty when Zhang Heng lived, earthquakes were frequent. According to the Records of Five Elements in the History of the Later Han Dynasty, there were 26 * * * earthquakes in the thirty years from the 4th year of Yonghe (AD 92) to the 4th year of Andi Yan Guang (AD 125).

Earthquake areas sometimes reach dozens of counties, causing ground fissures and landslides, houses collapsing and rivers flooding, causing huge losses. Zhang Heng has many personal experiences about earthquakes. In order to master the national earthquake dynamics, after years of research, he finally invented the world's first seismograph-Hou Feng seismograph in the first year of Yangjia (AD 132).

At that time, an earthquake in the western region was successfully predicted by using this instrument, which attracted the attention of the whole country. This is earlier than the earthquake history recorded by instruments in western countries 1700 years.

Bell invented the telephone.

Bell himself is an acoustic physiologist and a deaf-mute language teacher. Before him, the German Philip Rice had invented the telephone, but its sound transmission effect was too poor to be used in practice. On March 1876, Bell and his colleagues tested the world's first available telephone.

In addition, Bell also invented an instrument for measuring hearing, an instrument that can be used to find metals in the human body and other inventions.

Bell holds a patent for the invention of the telephone, but it has also been pointed out that antonio meucci, an Italian who immigrated to the United States, was the inventor of the telephone.