What are the main achievements of the World Expo?

Do you need this information about the inventions that changed the world in previous World Expositions?

In p>1853, at the World Expo held in new york, USA, American Lisa Otis showed his invented escalator in a dramatic way. He stood on the elevator platform carrying wooden boxes, vats and other goods. When the platform rose to a certain height, he ordered to cut the cable. Some of the audience held their breath, some were blindfolded, and some prayed for him silently. At this time, the safety braking device designed by Otis started, and the platform stopped safely in place, motionless. Then, Otis started the automatic device to let the stairs go up and down automatically. At this point, the audience gave him the warmest applause.

This performance, which looked like magic to visitors at that time, won Otis an international reputation, and the escalator he invented was exported to all countries in the world. This escalator can't be called an elevator yet, because it is powered by a steam engine. In 1889, Otis made the first elevator in the world.

saxophone went to the world in 1855

At the 1855 World Expo held in Paris, adolphe sax, the inventor of saxophone, was the most conspicuous, and he won the special medal of honor for the exhibits of musical instruments. At that time, the French emperor Charles Louis Napolé on Bonaparte saw someone holding a strange long-billed horn on display and asked, "What is this?" The man replied, "sir, this is a newly invented musical instrument called saxophone." The inventor is me, adolphe sax. " The man also played a live song for Charles Louis Napolé on Bonaparte, and Charles Louis Napolé on Bonaparte greatly appreciated this novel instrument.

In fact, as early as 184, saxophone was invented by saxophone according to the pronunciation principle of flute. But after the Paris World Expo, saxophone was widely known.

The gardener invented reinforced concrete in 1867

Reinforced concrete was first known to the world at the Paris World Expo in 1867. The inventor of this new material is an ordinary French gardener named Joseph Moniere. He tried many methods to make the flowerpot stronger. He first weaves the thin steel bar into the shape of a flowerpot, and then daubs cement mortar on both sides of the steel bar. After drying, the flowerpot is very strong. Moniere's new invention didn't attract much attention from horticulturists, but the visiting architects were particularly interested. With the recommendation of some famous architects, reinforced concrete has quickly become an important material in modern architecture.

The world's largest steam engine appeared in 1876

At the opening of the Philadelphia World Expo in 1876, President Grant of the United States and King Pedro II of Brazil pulled the switch and started the Collins steam engine, which was the main power source of some machinery in various venues of the Expo. After the steam engine with a mass of 6 tons and a power of 12, kilowatts was started, thousands of machinery in the exhibition hall roared in unison, and the exhibition hall vibrated slightly in the rumble.

In 1893, popcorn became the most dazzling exhibit

In 1893, the most dazzling exhibit at the Chicago World Expo was popcorn, which we often eat now. Previously, American Lucheim found that when corn was heated in a closed container, it would explode like a flower when it was opened while it was hot, because the air pressure in the container was reduced. Later, Lucheim's younger brother heated some sugar and corn together, and the popcorn was crystal clear, beautiful and delicious. During the World Expo, tens of thousands of people lined up to taste popcorn every day.

The film legend was staged at the 19 World Expo

At the 19 World Expo in Paris, France, the films made by the French Lumiere brothers were displayed in front of the whole world and became one of the most eye-catching focuses. The first film screening activity of Lumiere Brothers was as early as 1895, but the projection tray and new type of photographic film invented by the two brothers, which can continuously display the film, appeared at the World Expo in 19, providing a technical model for the emergence of modern film machines. At that time, the projector was hand-operated, and there was no dubbing. What people heard was the huge noise made by the machine, and the picture was very simple, but people still watched it with relish.

entered the era of communication in 194

In 194, at the World Expo in St. Louis, the most striking thing was the electrical hall. At that time, it was still at the beginning of the electrical age. In the electrical museum, visitors could talk to friends in other cities in the United States by radio. Edison, a famous American inventor, personally went to the electrical hall to check all the communication instruments to ensure that the equipment could be used normally.

In 1933, the production line of the factory appeared

In 1933, the Chicago Expo opened its doors to the industrial and commercial giants at that time, and General Motors, Chrysler and Sears Department Store were allowed to build their own pavilions. This exhibition focuses on the achievements of science in industrial production. The oil refinery, electric tractor, toothpaste pipeline and bread production line at work have all been moved to the site, so that people can experience the increasingly automated industrial production. Exhibitors also used movies, stereo sets, open-air performances and other entertainment methods to attract people's attention to industrial products.

atomium symbolizing peace in 1958

The 1958 Brussels World Expo was the first World Expo after World War II, and the biggest highlight at the venue was a huge atomic structure model. It simulates the crystal structure of iron, symbolizes the safe and peaceful application of atomic energy by human beings, and represents people's willingness to pursue peace. In the middle of atomium, there was an elevator with the highest speed in Europe at that time, which could send 22 people to the top sphere of 92 meters in just 23 seconds. There are six large plexiglass windows around the top floor, and there are many telescopes. 25 people can have a bird's eye view of the beautiful scenery of Brussels at the same time.

The space age began in 1962

"Humans in the space age" was the theme of the 1962 Seattle World Expo. The landmark building of this World Expo is the space needle, which looks like a flying saucer standing on a long thin metal.

The "Science Fiction World" exhibition area of this World Expo has attracted widespread attention, and some ideas displayed in it have not yet been realized. For example, people can go to work by private rotorcraft in the future; In the future, people can turn on the food faucet just like turning on the faucet and get a steady stream of food; In the future, there will be a huge roof suspended over the city, and human beings can control and adjust the weather in the city at will.

Showing rocks from the moon in p>197

In July p>1969, the American spaceship Apollo 11 successfully reached the moon and returned to Earth with moon rocks. In 197, at the World Expo in Osaka, Japan, people enjoyed this remarkable exhibit-Moon Rock. This stone came from the moon to the earth, and its light eclipsed many human treasures. The moon rocks are displayed on the towering platform, which meets the needs of many tourists to watch at the same time.

The Rubik's Cube swept the world in 1982

In 1982, the once unknown Rubik's Cube stood out at the Knoxville World Expo. At the beginning, Professor rubik of Budapest Institute of Architecture invented the Rubik's Cube only as a teaching tool to help students enhance their spatial thinking ability. Later, he found that how to restore the chaotic color squares was actually an interesting game. After the exhibition at this World Expo, the Rubik's Cube has become a world-famous intellectual game toy.

The super tomato in 1985 was shocking

In 1985, the most dazzling star at the Tsukuba World Expo in Japan was a tomato with 13, fruits. This tomato leaves the soil from the beginning of its seedling, puts it in a sink, dissolves ordinary fertilizer in water at a proper concentration as a plant nutrient, and then manages the water temperature and water flow, and fully supplies oxygen.

This tomato tree has attracted countless surprises. First, soilless culture has completely subverted the traditional concept of human cultivation. Second, 13, fruits have made it a "hero" in the history of tomato cultivation.

The maglev train made its debut in 1986

In 1986, the theme of the Vancouver World Expo was "The world is moving, the world is in contact", and transportation technology became the key exhibition object. This World Expo exhibited a maglev train made in Japan with a speed of more than 3 kilometers per hour, which used electromagnetic force to float off the track and slide. It is called "4S" car, that is, fast, silent, Safe and Smooth.