Long ago, before the light bulb was invented, many people generally used candle lamps and kerosene lamps for lighting at night. Edison was very upset at that time. He was determined to invent a durable and bright light bulb. Edison failed again and again.
A few years later, Edison's failed experience was laughed at by many people, thinking that he was daydreaming, especially Edison did many failed experiments. In the face of others' doubts and distrust, Edison did not give up the filament experiment plan, but used it as a driving force to continue his own scientific experiment.
So I tried to use carbonized cotton swabs as filament material to vacuum the bulb. This substance lasted for a long time, but it soon burned out after 45 hours. But Edison was so excited that he had tried more than 6000 experiments, and this time he undoubtedly found a breakthrough.
Edison started the filament experiment again, and everything paid off. He found that tungsten wire can be used as electric lamp material, so he was ecstatic. This material is an excellent material for making light bulbs, which emits very bright light, is not easy to burn out and is suitable for long-term use. In this way, the light bulb will gradually enter the homes of ordinary people and become an indispensable lighting tool for us at night.
Step 2: tile
The structure of the new steam engine invented by Watt on the basis of the original steam engine has hardly changed in the next 50 years. The importance of the invention of Watt's steam engine is incalculable. It is widely used in factories, becoming the power of almost all machines, changing people's work and production methods, greatly promoting technological progress and opening the curtain of the industrial revolution.
It enables the factory to be located in a more economical and effective place that does not depend on coal mines, and can operate all the year round without relying on hydropower, further promoting the development of economies of scale, greatly improving productivity and making business investment more efficient.
The steam engine makes it possible to innovate a series of precision machining, and higher technology ensures the performance improvement of various machines, including the steam engine itself. After continuous efforts, steam with higher pressure was introduced, and steam trains and steam ships soon came out one after another.
3. Newton
Newton made reflecting telescope in 1672. He used the universal gravitation between particles to prove that the external gravitation of a spherically symmetric sphere can be replaced by particles with the same mass in the center. He also explained various phenomena of tides with the principle of universal gravitation, pointing out that the magnitude of tides is not only related to the phase of the moon, but also related to the orientation of the sun. Newton predicted that the earth was not a right sphere. Precession is caused by the disturbance of the equator by the sun.
4. Madame Curie
At the end of 1902, Madame Curie extracted one tenth of extremely pure radium chloride and accurately determined its atomic weight. Since then, the existence of radium has been confirmed. Radium is a natural radioactive substance, which is extremely difficult to obtain. Its shape is shiny white crystal like fine salt. Radium has a slight blue fluorescence, and it is this beautiful light blue fluorescence that blends into a woman's beautiful life and unyielding faith.
In spectral analysis, it is different from the spectral line of any known element. Radium is not the first radioactive element discovered by human beings, but it is the most radioactive element. Using its powerful radioactivity, we can further discover many new properties of radiation. Therefore, many elements can be further applied to practice.
Laser has different effects on different cells and tissues. Those rapidly multiplying cells were quickly destroyed by radium irradiation. This discovery makes radium a powerful means to treat cancer. Cancer is made up of cells that reproduce very quickly, and the damage caused by laser rays is far greater than that caused by surrounding healthy tissues.
This new treatment method was quickly developed all over the world. In France and France, radium therapy is called Curie therapy. The discovery of radium has fundamentally changed the basic principles of physics, which is of great significance for promoting the development of scientific theory and its application in practice.
5. The Wright brothers
The Wright brothers are famous American inventors. My brother is wilbur wright and my brother is Orville Wright. 1903 12 17, the Wright brothers made the first test flight of a fully controlled, self-powered and heavier-than-air plane, which was the world's first plane, Voyager 1.
The airplane is one of the greatest inventions in history. Some people rank it alongside TV and computer as the three greatest inventions that have the greatest influence on mankind in the 20th century. The Wright brothers created a flight control system that allowed the aircraft to fly under control, thus laying the foundation for the practical use of the aircraft. This technology is still applied to all aircraft today. The great inventions of the Wright brothers changed the transportation, economy, production and daily life of human beings, and also changed the military history.