The float in the clepsydra represents an early example of a feedback mechanism" (Nocks, The Robot. Ctesibus' clepsydra remained the most accurate clock until the fourteenth century when mechanical clocks using a system of leaded weights and levers replaced hydraulic ones. 1956 Octomarked the patenting of the first digital alarm clock by D.E. ancient Egyptians came up with an ingenious invention that later became known as the world’s first mechanical clock. A float and pointer set in a third container indicated the time elapsed. Even though Greek and roman engineers tried to perfect this type of clocks even in 1st millennia BC (Pluto famously created first water based alarm clock), it was Chinese polymath (person whose expertise spanned significant number of various subject areas) Su Sung who devised first mechanized water clock that worked on the principle of. But, Plato (428348 BCE), a greek philosopher constructed his own version of an alarm clock with vessels much ahead of Ctesibius. He used a three-tier system in which a large body of water emptied into the clepsydra to insure it remained full. Fist mechanical watches used water as their power source. Ancient alarm clock used by the Egyptians was made by a greek engineer, physicist and mathematician Ctesibius (285222 BCE) who lived in Alexandria, Ptolemaic Egypt. Ctesbius' objective was to regulate the clock so that the water level did not have to be continually tended. 11 The French inventor Antoine Redier was the first to patent an adjustable mechanical alarm clock, in 1847. This device he made only for himself however, and it only rang at 4 am, in order to wake him for his job. As it emptied, the decrease in pressure slowed the dripping. The first American alarm clock was created in 1787 by Levi Hutchins in Concord, New Hampshire. Some crazy alarm clocks have been created over the years too. Many could be set to ring a bell at a certain time. Theoretically, the interval between drips marked a specified time however, the rate of flow increased when there was more water in the trube. By the mid to late 1400s, some houses had their own heavy iron wall clocks. A person was free to speak until the tube was empty. This clock also had an escapement mechanism, which would keep time by counting the swings of a water clock. When it was reopened, the water dripped through a small opening at the lower end. In the 13th century, a Chinese engineer named Su Sung was the first person to design a mechanical clock that could provide timekeeping for over 200 years. A long tube was plunged into the water and when it was full, the opening at the top was closed. It was also used in law courts to time speeches. "During the first Alexandrian period, it was adapted as a way for physicians to count the pulse. Ctesbius's clepsydra kept more accurate time than any clock invented until the Dutch physicist Christiaan Huygens invented the pendulum clock, and studied the use of a pendulum to regulate a clock in the 17th century. Greek inventor and mathematician Ctesibius (Ktesibios,Tesibius Κτησίβιος), probably the first head of the Museum at Alexandria, invented the first artificial automatic self-regulatory system by designing an improved water clock or clepsydra (water thief) that required no outside intervention between the feedback and the controls of the mechanism.
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