1434 AD
The First Self-Striking Water Clock

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In addition to the Egyptians (see also The ancient egyptians), many other people experimented with water clocks and some interesting variations sprouted forth. For example, in some cases a float was connected to a wheel and, as the float changed its level, the wheel turned to indicate the hour on a dial. Water clocks were also a standard means of keeping time in Korea as early as the "Three Kingdoms" period, and it was here that one of the first known automatic water clocks was devised in 1434. This clock was called Chagyongnu, which literally translates as "self-striking water clock." When the water reached a certain level, a trigger device released a metal ball which rolled down a chute into a metal drum to "gong the hour."
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These notes are abstracted from the book Bebop BYTES Back
(An Unconventional Guide to Computers)
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