23. A good way of measuring time is waiting for a bin to fill up. An example of this is the hourglass, which waits for sand to fill up in a glass "bin". Another example is the clepsydra. What did it use as its "bin filler"?
From Quiz A Long History in Measuring Time
Answer:
water
Literally, clepsydra in Greek means "water stealer". They are older even than hourglasses, as they are mentioned in ancient Chinese scrolls dating back to 4000 BC. They were widespread in use, and were considered very accurate and versatile time measuring devices.
Modern clepsydras are not found in abundance as technology has advanced. Nevertheless, they are a novelty, and often utilize several technologies rolled into one design. A great example of this is the Hornsby Water Clock in a mall in Hornsby, Australia, which uses the principles of a clepsydra, a water-wheel clock, and a pendulum clock in one artistic design.