Is there anything suitable for making an alarm clock?

Heartbeat-amy diamond has been using it for two years. An alarm clock is a kind of clock with an alarm device. It can not only indicate the time, but also send out sound signals or other signals according to people's predetermined time. The movement structure of alarm clock mainly includes mechanical and timely electronic. Other types, such as transistor hairspring and tuning fork, are rarely used. They are called desktop alarm clocks that are usually placed on the table and travel alarm clocks that are mainly used for travel.

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1, the time error of daily mechanical alarm clock is generally within120s/day, and that of timely electronic alarm clock is generally within 0.2s/day. There are many kinds of alarm clocks, mechanical and timely. Since people invented it by using the principle of pendulum, it has become an indispensable item in people's lives. Zhou Libo's "Hot Metal Rushing" III: "There is a mouth that never makes noise in front of the mirror frame, and the short pointer always points to five o'clock, which is a small alarm clock at the end of the factory." People's Literature No.8, 198 1: "I slept soundly all night and was awakened by the alarm clock at the bedside."

2. In ancient China, there were sundials, water clocks, fire clocks and copper pots dripping water. , can only be regarded as an ancient timer. ? 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.