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Yi Xing also owed much to the scholarly followers of Ma Jun, who had employed horizontal jack-wheels and other mechanical toys worked by waterwheels. [4] The Daoist Li Lan was an expert at working with water clocks, creating steelyard balances for weighing water that was used in the tank of the clepsydra, [4] providing more inspiration for Yi Xing.
He invented a mechanized water clock with the Tantric monk and mathematician Yi Xing (Chinese: 一行; pinyin: Yī Xíng; Wade–Giles: I-Hsing). [1] [2] [3] It was actually an astronomical instrument that served as a clock, made of bronze in the capital of Chang'an in the 720s. It was described by a contemporary text this way:
This is an accepted version of this page This is the latest accepted revision, reviewed on 27 December 2024. Type of clock A traditional wind-up (key-wound), mechanical spring-powered alarm clock An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or ...
The liquid in water clocks was liable to freezing, and had to be kept warm with torches, a problem that was solved in 976 by the Chinese astronomer and engineer Zhang Sixun. His invention—a considerable improvement on Yi Xing's clock—used mercury instead of water. Mercury is a liquid at room temperature, and freezes at −38.83 °C (−37.9 ...
Yi Xing's device also had a mechanically timed bell that was struck automatically every year, and a drum that was struck automatically every quarter-hour; essentially, a striking clock. [24] Yi Xing's astronomical clock and water-powered armillary sphere became well known throughout the country, since students attempting to pass the imperial ...
Before European clocks, China developed a water-driven astronomical clockwork technology, starting with the first century AD scientist Zhang Heng (78–139). The Tang dynasty Chinese Buddhist monk and inventor Yi Xing (683–727) created a rotating celestial globe that was turned by a water clock mechanism driven by a waterwheel.
Yi Xing (683–727), Chinese Buddhist and engineer, astronomical clock. Zhang Sixun (10th century AD), Chinese engineer, clepsydra with water wheel. Su Song (11th century AD), Chinese engineer, clepsydra with water wheel and ratchet. Al-Dschazarī, Arabic engineer and author of the 12th century, elephant clock.
A cuckoo clock with mechanical automaton and sound producer striking on the eighth hour on the analog dial. This displays the count of seconds, minutes, hours, etc. in a human readable form. The earliest mechanical clocks in the 13th century did not have a visual indicator and signalled the time audibly by striking bells.
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