The history of alarm clock

In ancient China, there were sundials, water bells, fire bells, copper pots dripping water and so on, which can only be regarded as ancient timepieces. Without a clock that doesn't tick, it can't be called a clock 1090, Su Song, the prime minister of the Northern Song Dynasty, presided over the construction of a water transport instrument, which can tell the time and ring the bell. Its structure is almost the same as that of a clock, and it can be called the originator of the clock. There is only one second error every day. It has an escapement mechanism that can make a ticking sound when it works. This is the difference between a clock and a timer. The international watch industry regards the escapement as the heart of the watch. In Switzerland, an authoritative work in the world clock industry wrote: "The escapement mechanism used in modern mechanical clocks originated from the invention of Su Song in ancient China." Su Song, a scientist in Song Dynasty, invented the "celestial sphere". It is recorded in Needham's book, a famous British historian of science and technology: "Su Song has been completely successful in principle since he combined horological machinery with astronomical observation instruments. He was 600 years ahead of robert hooke. For example, he, Fei and Hooke are regarded by the west as the inventors of the astronomical clock for seven and a half centuries. " 12 century later, China's clock technology was introduced to Europe, and European talents made clocks. It can be said that China people created the history of human clocks and watches, and also influenced the progress of western clocks and watches later.

1283, the first mechanical clock driven by weight appeared in English monasteries.

Monks in northern Italy began to build bell towers (or bell towers) in the third century A.D./Kloc-to remind people of the time of prayer.

/kloc-in the middle of the 0/6th century, Germany began to have clocks on the table. Those clocks have only one hand, and the clock face is divided into four parts, which makes the time accurate to the nearest 15 minutes.

/kloc-in the 0/7th century, the law of pendulum sum gradually appeared. Its operational accuracy has been greatly improved. Giovanni de Dante is known as the father of European clocks and watches. It took him 16 years to make a fully functional clock, called the cosmic armillary sphere, which can show the trajectories of some planets in the sky, as well as reflect religious festivals and daily time. Used in 1364. The clock made by Dante is not the first clock in Europe. It is said that the first clock that can tell the time in Europe was made in Milan in 1335.

1657, huygens discovered that the frequency of pendulum can calculate time, and made the first pendulum clock. 1670, an Englishman William Clement invented the anchor escapement.

1695, Tom Ping of England invented the I-wheel escapement. Later, Graham of the same country invented the static escapement mechanism.

From 1728 to 1759, the navigation clock came out.

1765, the free anchor escapement was born.

1797, Eli Terry, an American, obtained the patent right of clocks and watches. He is regarded as the originator of American watch industry.

1840, British watchmaker Bain invented the electric clock.

1946, American physicist Dr. Libby figured out the principle of atomic clock. Two years later, the world's first atomic clock was made, and it is still the most advanced clock. Its operation is completed by the natural vibration of cesium atoms and ammonia atoms, and it can run accurately within 300 years with very small error.

From 18 to 19 century, the watch manufacturing industry gradually implemented industrial production.

In the 20th century, it began to enter a timely period.