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Around 1400 B.C. (about 3,400 years ago), water clocks were invented in Egypt. The name for a water clock is clepsydra (pronounced KLEP-suh-druh). A water clock was made of two containers of water, one higher than the other. Water traveled from the higher container to the lower container through a tube connecting the containers. The containers had marks showing the water level, and the marks told the time. Water clocks were very popular in Greece, where they were improved many times over the years. Look at the picture below. Water drips from the higher container to the lower container. As the water level rises in the lower container, it raises the float on the surface of the water. The float is connected to a stick with notches, and as the stick rises, the notches turn a gear, which moves the hand that points to the time.
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Multi-function Units
ID: HP-022297
electron bell
ID: HP-014498
electron bell
ID: HP-014502
electron bell
ID: HP-014507
alarm clock
ID: HP-014514
alarm clock
ID: HP-014517
alarm clock
ID: HP-014522
alarm clock
ID: HP-014526
alarm clock
ID: HP-014531
alarm clock
ID: HP-014538
excessive function desk bell
ID: HP-014557
excessive function desk bell
ID: HP-014561
excessive function desk bell
ID: HP-014563
excessive function desk bell
ID: HP-014565
excessive function desk bell
ID: HP-014568
excessive function desk bell
ID: HP-014572
excessive function desk bell
ID: HP-014574
excessive function desk bell
ID: HP-014577
excessive function desk bell
ID: HP-014579
excessive function desk bell
ID: HP-014582

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