How to Measure Time: VIDEO/DVD, How was time measured before the clock was invented? In fact, there are many ways of measuring time and, if you think about them, many are familiar to us—the sundial, the egg timer. Bob Symes explains how we can use one process (such as burning a candle marked at regular intervals) to measure another (such as the passage of time).


			How to Measure Time

How was time measured before the clock was invented? In fact, there are many ways of measuring time and, if you think about them, many are familiar to us—the sundial, the egg timer. Bob Symes explains how we can use one process (such as burning a candle marked at regular intervals) to measure another (such as the passage of time). (7 minutes)

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VHS VIDEO

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DVD