How Do You Make A Simple Water Clock?
The water clock sits alongside the sundial in history as one of the earliest timekeeping mechanisms invented by mankind. Dating back to approximately 1500 B.C., this type of clock was used by several ancient societies including Egyptians, Greeks and Chinese. Unlike the sundial, the water clock can be used to observe time at night, indoors or in overcast conditions. The basic concept implemented by the water clock is that a set time is required for water to flow from one container to another. Most water clocks consist of a system in which water drips from one elevated container into another. Use the thumbtacks to punch a small hole in the bottom of each paper cup. The more paper cups used, the longer it will take for the water to filter to the bottom. Place the jar and the cardboard on a flat, even surface. Orient the rectangular piece of cardboard so that when it stands, it is taller than it is wide. Stand the cardboard up flush against the side of the clear jar. The bottom of the card
