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Water Clock

How do you make a water clock? Let's see.

Materials Required

A small plas c cup, four paper clips, a long label with adhesive
behind it, a watch with a second hand, and a pen, water, a clear
plas c bo le, four thin wooden s cks.

Let's Do

 Ask an adult to cut the top of the plas c bo le.
 Use a wooden s ck to make a hole near the base of the cup.
 Cross two s cks with the other two s cks and a ach them to the open end of the

bo le with paper clips, as shown. This will make a support.
 S ck the label ver cally on the side of the bo le. Now make a make on the label

about an inch above the bo om of the label.
 Fill the bo le with water ll the mark.
 Place the cup on the support. Fill the cup into the bo le. At each minute , make a

mark on the label unit the cup is empty.
 Now this is your water clock. Fill the bo le to the first mark again and fill the cap

with water. By nothing the level of water in the bo le, you can say how much me
has passed.
 It is gravity that makes the water drip at a regular rate to make your water clock
work.
 An hourglass or sand clock uses the same principle to measure me. The top bowl
is filled with sand, which passes into the lower bowl. Hourglasses are preset to a
specific me so that the sand is just enough to completely pass into the lower
bowl with in that me.

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