Search results
Results from the WOW.Com Content Network
The race bringing water from the mill pond to the water wheel is a headrace; the one carrying water after it has left the wheel is commonly referred to as a tailrace. [ 1 ] Waterwheels were used for various purposes from things such as agriculture to metallurgy in ancient civilizations spanning the Hellenistic Greek world , Rome , China and India .
Complex gearing for uniquely Chinese clockworks were continued in the Ming dynasty (1368–1644), with new designs driven by the power of falling sand instead of water to provide motive power to the wheel drive, and some Ming clocks perhaps featured reduction gearing rather than the earlier escapement of Su Song. [12]
Although the year of his birth is uncertain, it is known that Du Shi was born in Henei, Henan province. [2] Du Shi became an Officer of Merit in his local commandery before receiving an appointment in 23 as a government clerk under Gengshi Emperor (r. 23–25), following the revolt against the Xin dynasty usurper Wang Mang (r. 9–23). [2]
This list of ancient watermills presents an overview of water-powered grain-mills and industrial mills in classical antiquity from their Hellenistic beginnings through the Roman imperial period. The watermill is the earliest instance of a machine harnessing natural forces to replace human muscular labour (apart from the sail ). [ 3 ]
In ancient China, the trip hammer evolved out of the use of the mortar and pestle, which in turn gave rise to the treadle-operated tilt-hammer (Chinese: 碓 Pinyin: dui; Wade-Giles: tui). [1] The latter was a simple device employing a lever and fulcrum (operated by pressure applied by the weight of one's foot to one end), which featured a ...
The device then appeared in ancient Egypt from about 200 B.C., featuring a pair of gear-wheels [dubious – discuss]. [2] A version of the chain pump was used in ancient Greece and Rome, sometimes with pots, or scoops fixed to the chain, which, as they passed over the top pulley, tipped the water out; a 2nd-century example is preserved in ...
This sub-section is about paper making; for the writing material first used in ancient Egypt, see papyrus.. Paper: Although it is recorded that the Han dynasty (202 BC – AD 220) court eunuch Cai Lun (50 AD – AD 121) invented the pulp papermaking process and established the use of new materials used in making paper, ancient padding and wrapping paper artifacts dating from the 2nd century BC ...
A water clock or clepsydra (from Ancient Greek κλεψύδρα (klepsúdra) 'pipette, water clock'; from κλέπτω (kléptō) 'to steal' and ὕδωρ (hydor) 'water'; lit. ' water thief ' ) is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount ...