Stone Arch Bridge-There is an arched stone bridge 5 miles south of Zhao County, Hebei Province, China. This is the world-famous Zhao Zhouqiao and one of the oldest stone arch bridges in the world. This bridge was built by craftsmen Li Chun and thomas lee in Sui Dynasty, and it has been nearly 1400 years since. It has beautiful appearance and unique structure. Bridges like this were discovered in Europe in the middle of19th century, which was later than in China 1200 years ago.
Iron Bridge-1779, Abraham Darby of England built the world's first iron bridge in Cobrookdale, central England. This iron bridge across the Severn River is a 30-meter-long single-span semicircular arch with five rows of cast iron ribs. There are many ingenious ideas about the casting of this bridge.
Suspension Bridge-The original suspension bridge is soft and easy to bend, which is not conducive to vehicle walking. Modern suspension cables solve this problem by hanging ribbed bridge plates with steel cables. The design of the first suspension bridge with horizontal deck in western languages can be found in the works of Austrian Bishop Valenzi O 1595. The design connects the iron bars together to form a suspension cable. 180 1 year, Finley first built a suspension bridge on Jacob Creek in Pennsylvania, USA, with a length of 2 1 meter.
1803, France took the lead in building a cable bridge. Sekun has built several bridges with a span of over 90 meters. Vic invented a cable made of steel wire on the bridge. It is not necessary to hang heavy steel cables on the top of the bridge tower.
Reinforced concrete bridge-The first reinforced concrete bridge in the world is a concrete viaduct built in Lianfennan, Scotland in 1899, with a span of 15m per span. 2 1 each arch of the bridge has hinges, so that the pier base can move. Melart, an engineer, was the first person to understand the functions of the three hinges. He built the first Swiss three-hinged arch bridge at 190 1, which is a slender reinforced concrete bridge.
Prestressed concrete bridge-After World War II, high-strength steel was made of Fresinai and applied to bridge design. From 1948 to 1950, he successively built five prestressed concrete bridges on the French River Marne, located in Esbury, Annette, Terry Ba Du, Chagis and Youxi. Each bridge adopts a flat arch, which is much flatter than the previous bridge arch.
What's the name of the first watch in the world? Watches are well-known daily necessities, and it has been 200 years since the first human watch came out. The original creator of watches was neither a Swiss watchmaker nor a watchmaker. According to textual research, its original creator is actually the French emperor Napoleon, who is extremely unattainable. 1806, in order to please Queen Josephine, Napoleon ordered craftsmen to make a small "clock" that could be worn on the wrist like a bracelet, which was the first watch in the world. After a period of time, the pocket watch is still a symbol of male status, while the watch is regarded as an accessory of women.
When did humans begin to have the concept of "time"?
The distant ancestors of mankind first knew that time would pass from tomorrow. About six thousand years ago, "Zhong" first appeared on the stage of human history: the sundial was born in the kingdom of Babylon. The ancients used sundials to master time according to the length and orientation of the sun's shadow. 4000 years ago, the leaky carving came out, enabling people to know the time day and night. Clocks and watches appeared after the middle of the thirteenth century.
/kloc-the early mechanical clocks that appeared in northern Italy and southern Germany around 0/270 were powered by a weighing hammer, which rang the attached clock every hour and automatically struck the time. 1336, the first clock was installed in a church in Milan. In the next half century, bells spread to European countries, and churches in France, Germany and Italy built bell towers one after another.
Soon, the clockwork technology was invented, and the size of the clock was greatly reduced. 15 10 years, German locksmiths first made pocket watches. At that time, the production of clocks and watches seemed to be limited to the sideline of locksmith. It was not until later that the accuracy of clocks and watches became higher and higher, and the skills of clocks and watches became more and more complicated, and professional watchmakers appeared.
1806, a watch specially made by Napoleon's wife and queen J. Jopifen is the earliest known watch record. This is a watch that pays attention to decoration and makes bracelets. At that time, pocket watches were very popular in men's world, and watches were regarded as women's accessories.
1885, the german navy ordered a large number of watches from Swiss watchmakers, and the practicality of watches was affirmed by the world and gradually popularized.
At the beginning of this century. The predecessor of Rolex-Wilsdorf &; Davis Company launched silver gentlemen's watches and ladies' watches, which was a great success and led watch manufacturers to compete to develop watches. Switzerland, which is famous for its pocket watch skills, also took the lead in making watches. 1926, Rolex developed a completely waterproof watch "ROLEX OYSTER", and in 193 1, it took the lead in bringing the self-winding watch "OYSTER PERPETUAL" to the market. Longines is not to be outdone, and its precision aviation clock flies across the Atlantic with American pilot Lindbergh, making it famous. 1929, CHRONOGRAPH, a watch with stopwatch function, came out, and CHRONOMETER, a precision watch for flight, was developed on this basis the following year.
At the end of 1960s, the history of mechanical watches turned a new page: 1969, Seiko Watch Company developed the world's first timely electronic watch, and the daily error was reduced to less than 0.2 seconds. 1972, Hamilton Company of the United States invented the digital display watch, and the motor and gear disappeared from the watch.
New technologies in watch manufacturing are emerging one after another, but mechanical watches have not died out. Although the output has been greatly reduced, the manufacturing technology has survived. Swiss watch manufacturers, in particular, still have a soft spot for mechanical watches today when quartz watches are dominant, and insist on producing high-grade mechanical watches and exporting them all over the world. Please accept me as a teacher.
What was the name of the first volcano in the world? It is the center of the earth, so all volcanic roots come from there.
What is the name of Guangji Bridge, the world's first retractable stone bridge?
What was the name of the first computer in the world? The first electronic computer, called ENIAC (abbreviation of electronic digital integrator and computer), was born in the United States in February 1946. Moore's team, which undertakes the development task, consists of four scientists and engineers, namely eckert, Moakley, Goldstein and bocks. Chief engineer eckert is only 24 years old.
ENIAC: It is 30.48m long, 1 m wide, with an area of170m2 and 30 operation desks, which is roughly equivalent to the size of 10 ordinary rooms. It weighs 30 tons, consumes electricity 150 kw and costs $480,000. It contains 17468 vacuum tubes, 7200 crystal diodes, 1500 relays, 70000 resistors, 10000 capacitors, 1500 relays, more than 6000 switches, and performs 5000 additions or 400 multiplications per second.
About the first computer in the world
According to most domestic media, the world's first electronic computer was the ENIAC written record invented by American John Mochili in last century 1946. But another way of saying it is that the world's first electronic computer is the "atanasoff-Berry Computer" developed by Professor John Vincent atanasoff of Iowa State University and his graduate student Clifford Berry from 1937 to 194 1.
However, few friends in China know the truth of this matter. Many domestic authors still promote ENIAC as the world's first computer in monographs, textbooks and even popular science activities. Therefore, as an IT worker, it is necessary to clarify the facts for our predecessors in the spirit of science. I hope this article will help to correct this important academic misunderstanding in the domestic intellectual circles for a long time, so as to set the record straight.
Confirm that the first computer in the world should be "ABC". 194 1 year, Mokoli, one of the inventors of "ENIAC", stayed at atanasoff's home for five days, taking this opportunity to steal research results and ideas. Later, together with eckert, he made "ENIAC" and applied for a patent, which was called "the father of modern computers" by the world. Atanasoff didn't pay attention to his great invention "ABC", and neither did the school. Mokoli's patent was overturned and revoked after the judgment of the US court. "The basic idea of modern computer comes from john vincent atanasoff".
What was the name of the first sunken aircraft carrier in the world? The aircraft carrier Brave of the British Navy was the first aircraft carrier in the world to sink in battle. The ship was sunk by a German U-29 submarine on September 1939. At that time, the U-29 submarine slowed down and the plane was recovered by the Brave. All the destroyers in alert state were sent to support a merchant ship that was being hit, slipped to a place only 2000 meters away from the Brave, and fired three torpedoes at it, two of which hit. In just 15 minutes, the Brave and its 578 officers and men sank to the bottom of the sea.
What's the name of the first cinema in the world? The earliest cinema in the world is the Electronic Theater in Los Angeles, USA, which was built in 1902.
The world's first drive-in cinema was founded by Richard, an American, in the backyard of his home in New Jersey at 1933.
The first cinema in China-1907 The first cinema-Ping An Film Company was built in Chang 'an Street, Beijing, and operated by foreign investors.
What was the name of the first Rubik's Cube in the world? Rubik's cube is a changeable intellectual toy. Lu Square is also called Square. 1974 was invented by Hungarian architecture professor Lu.
What's the name of the first person in the world? In the tradition of Bible and Koran, Adam (the name of the first human being)
What is the first name in the world? Adam, the second is Eve. China's myths and legends show that human beings did not appear alone at first, but appeared one by one. The allusion is that Nu Wa made man, so there is no name.