-
Egyptians told time by the shadow cast by the sun on Obelisk
-
Use the flow of water to measure time.
-
Ancient Chinese tie knows at regular intervals on a thick rope, then burn the rope and tell time by looking at how many knots had been burned. Later they burn candles with notches to tell time.
-
Adapted from the idea of obelisk, the Babylonians attached a gnomon to the middle of the dial to show the sun's position.
-
Two upright containers joined with a narrow opening. One container contained sand or other material that shift easily.Turn the hourglass upside down so that the materials poured into the bottom container to tell time.
-
Use physics principles of weights and balances to mark out increments of time over a 12-hour period.
-
Measures time through a system of coiled springs. It is built inside a metal ball with a lid, and the watch is placed in a picket or hung from a belt
-
Powered with batteries and quartz crystal. Shows the time as numbers.
