Xi'an watch

Collectively, clocks and tables. Clocks and watches are measuring and indicating the time precision instruments. Clocks and watches are usually less machine the size of a difference. According to international practice, the movement more than 50 mm in diameter, thickness of more than 12 mm of a bell; a diameter of 37 to 50 mm and a thickness of 4 to 6 mm, known as pocket watch; the watch diameter 37 mm or less; diameter of not more than 20 mm or machine heart area of ??not more than 314 mm2, called the female form. The watch is invented by mankind smallest, most rugged and most sophisticated machinery. Chinese ancient sundial, water clock, fire bell, Tonghudilou, etc., which can only be regarded as the ancients timer. No clocks tick tick sound, called the watch can not sundial. To 1090, the Northern Song Dynasty prime minister chaired Su Song built a clock tower, can chime bell, its structure has been similar to the structure of modern clocks, watches and clocks can be called the originator. Just a second error per day. Moreover, it has escapement, it can ticking ticking sound when it is escapement work. This is the difference between clocks and timers. International watch industry regarded deemed watch escapement heart. In Switzerland, there is an authoritative books on the world watch industry wrote:. "Escapement used in modern mechanical clocks originated in ancient China Su Song of the invention," Song Dynasty scientist Su Song and invented the "celestial globe", the famous British science and technology historian Joseph Needham's book reads: "Since the Susong mechanical watches and astronomical observation instruments binding on the principle has been completely successful, he handsomer than Robert Redford Hook first six centuries, for example, and Fiji and Hooke with the West considered Astronomical watches inventor first seven and a half century. "After the 12th century, the Chinese watch technology introduced to Europe, Europeans made the watches can be said that the Chinese people to create a history of human watches, and influenced the later progress of Western clocks. 1283's first in the history of weight-driven mechanical clock appeared in England in the monastery. 13th century monk in northern Italy began to build the bell tower (or bell tower), its purpose is to remind people of prayer time. 16th century table clock began in Germany. Those bell only one pin, the clock face is divided into four parts, so that accurate time to the nearest 15 minutes. 17th century, the gradual emergence of the pendulum and the statute. It is running accuracy has been greatly improved. Father Giovanni De Dan watch the first European known. He spent 16 years to create a full-featured clock, called the cosmic celestial globe, some of which can be expressed in the sky running track planets, may also reflect the religious festivals and the time of day has it in 1364 It began to be used. Dan is not the first bell made Europe's first bell. It is said that Europe's first timekeeping clock can be made in 1335 in Milan. 1657, Huygens discovered the pendulum frequency can calculate the time, made the first pendulum clock. 1670 Englishman William Clement (William Clement) invention anchor escapement. In 1695, the British invented the word Tom flat wheel escapement. Later, Graham invented with the country still escapement. 1728-1759, the nautical clock available. In 1765, a free anchor escapement was born. In 1797, the American Eli Terry (Eli Terry) to obtain a patent bell. He is regarded as the ancestor of American watch industry. In 1840, the British watchmaker Bain invented the electric clock. In 1946, American physicist Dr. Libby to clarify the principles of atomic clocks. Two years later, he created the world's first atomic clock, atomic clock has also the most advanced. Its operation is the use of cesium, the natural vibration of the atoms and ammonia to complete, it can operate in the 300 years can accurately, the error is very small. 18-19 century, watchmaking industry gradually implement industrial production. 20th century, began to enter the quartz of time. The 21st century, according to the principle and the development of the atomic clock radio clocks automatically when the technology matures. 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