The second hand refers to the pointer on the clock that moves in seconds, and every time it moves a small space, it is 1 second. Convert 60 seconds into minutes, and divide 60 by 60, which is 1 minute. The clock is a timing device and a precise instrument for measuring and indicating time. Clocks are usually distinguished by the size of the internal machine.
According to international practice, clocks and watches with a movement diameter greater than 80 mm and a thickness greater than 30 mm; A pocket watch with a diameter of 37 ~ 50 mm and a thickness of 4 ~ 6 mm is called a pocket watch; Watches with a diameter less than 37 mm; A watch whose diameter does not exceed 20mm or whose movement area does not exceed 3 14m2 is called a women's watch. The watch is one of the smallest, strongest and most sophisticated machines invented by human beings.
The power of modern clocks and watches includes mechanical force and electricity. Mechanical clock is a kind of timer which uses the energy released by heavy hammer or spring as power to drive a series of gears to run, adjusts the speed of gear train with the help of escape governor, and indicates time and metering time with hands. Electronic clock is a kind of modern timer which is powered by electric energy, and LCD displays numbers and timely hands.
In ancient China, people also used water to time-dripping water from a copper pot, and burning incense to time. Put the incense horizontally and put a rope with steel balls on it. Ancient artisans in China invented leaky carving again. As a timer, clepsydra is used much later than sundial, but it is more common. In the Jiaotai Hall of the Forbidden City, a copper pot is missing.
Current situation of watch industry:
Clocks and watches have always been one of the favorite commodities of Chinese people. Since the founding of New China, the state has invested a lot of money to develop the watch industry, which has made the industry develop rapidly. Since then, China's reform and opening up and economic globalization have brought prosperity to China's watch industry.
Judging from the regional pattern, six major clock producing areas, such as Pearl River Delta, Fujian, Zhejiang, Jiangsu, Shandong and Tianjin, led by Guangzhou and Shenzhen, have been formed in China. In terms of output, China has become a big watch producer in the world, ranking first in the world. 20 1 1 year, the output of clocks and watches in China reached1590,000 and1300,000 respectively.
Although the development of watch industry in China has made great progress, the credibility and influence of domestic watch enterprises and their brands in the international market are still negligible. Although the output has reached more than 80%, the output value accounts for less than 30%, and they still have no right to speak and price.