Time-piece in which time is measured by the flow of liquid into or out of a vessel
For the individual water clock at The Children's Museum of Indianapolis, see Water clock (Indianapolis).
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 of liquid can then be measured.
Water clocks are one of the oldest time-measuring instruments.[1] The simplest form of water clock, with a bowl-shaped outflow, existed in Babylon, Egypt, and Persia around the 16th century BC. Other regions of the world, including India and China, also provide early evidence of water clocks, but the earliest dates are less certain. Water clocks were used in ancient Greece and in ancient Rome, as described by technical writers such as Ctesibius (died 222 BC) and Vitruvius (died after 15 BC).
A waterclock or clepsydra (from Ancient Greek κλεψύδρα (klepsúdra) 'pipette, waterclock'; from κλέπτω (kléptō) 'to steal', and ὕδωρ (hydor) 'water';...
range of duration timers, a well-known example being the hourglass. Waterclocks, along with sundials, are possibly the oldest time-measuring instruments...
clock mechanisms in astronomical clocks in the 10th and 11th centuries, respectively. A striking clock outside of China was the water-powered clock tower...
The elephant clock was a model of waterclock invented by the medieval Islamic engineer Ismail al-Jazari (1136–1206). Its design was detailed in his book...
This is a bibliography of waterclocks. Barnett, Jo Ellen (1998). Time's Pendulum: From Sundials to Atomic Clocks, the Fascinating History of Timekeeping...
time by continuous processes, such as the flow of liquid in waterclocks, to mechanical clocks, and eventually repetitive, oscillatory processes, such as...
The Hornsby WaterClock, titled Man, Time and the Environment is a piece of kinetic sculpture, a decorative fountain and a functional clock in the Florence...
Clock towers are a specific type of structure that house a turret clock and have one or more clock faces on the upper exterior walls. Many clock towers...
A turret clock or tower clock is a clock designed to be mounted high in the wall of a building, usually in a clock tower, in public buildings such as...
The Clock of Flowing Time (German: Uhr der fließenden Zeit) is a 13 metres (43 ft) high waterclock extending over three floors in the Berlin Europa-Center...
The Jayrun WaterClock, a waterclock built by the Muslim engineer Muhammad al-Sa'ati, was positioned at the gate of Damascus, Syria, at the exit of the...
changes to waterclocks to accommodate this. However, these were changes to the time divisions of the day rather than setting the whole clock forward. In...
hours, or days. The clock may also contain bells and gongs which act as strikers. Although the waterclock and astronomical clock were known in China...
variety of means such as a pendulum. Alarm clocks first appeared in ancient Greece around 250 BC with a waterclock that would set off a whistle. This idea...
of all-mechanical clocks. This caused a shift from measuring time by continuous processes, such as the flow of liquid in waterclocks, to repetitive, oscillatory...
include the gear, screw, rotary mills, bronze casting techniques, waterclock, water organ, the torsion catapult, the use of steam to operate some experimental...
origin of the hourglass is unclear. Its predecessor the clepsydra, or waterclock, is known to have existed in Babylon and Egypt as early as the 16th century...
McK. Camp II, "Notes on a WaterClock in the Athenian Agora", Hesperia 46 (1977), pp. 147–161. JSTOR 147833. (The clock at the Amphiareion is discussed...
clock is a clock that sounds the hours audibly on a bell, gong, or other audible device. In 12-hour striking, used most commonly in striking clocks today...
instrument. He improved the waterclock or clepsydra ('water thief'), which for more than 1,800 years was the most accurate clock ever constructed, until...
The Borugak Jagyeongnu ("WaterClock of Borugak Pavilion"), classified as a scientific instrument, is the 229th National Treasure of South Korea and was...
A clock position, or clock bearing, is the direction of an object observed from a vehicle, typically a vessel or an aircraft, relative to the orientation...
mechanical clock technology to the needs of traditional Japanese timekeeping. Clocks have existed in Japan since the mid-7th century AD in the form of water clocks...
An astronomical clock, horologium, or orloj is a clock with special mechanisms and dials to display astronomical information, such as the relative positions...
of the Madrasa also had a salary. In 1235, an early monumental water-powered alarm clock that announced the appointed hours of prayer and the time both...