Class 7
Chapter 8 Class 7 - Measurement of Time and Motion (Curiosity)

Before clocks existed, people used four main devices to measure time within a day.

Ancient Time-Measuring Devices SUNDIAL Uses shadow of an object cast by sunlight WATER CLOCK Uses flow of water out of or into a vessel HOURGLASS Uses flow of sand from one bulb to another CANDLE CLOCK Marked candle that burns
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