Choose a dowel that is sturdy but not too heavy. Please enter a search term in the text box. When you start your water clock, water should steadily drip from the upper container into the lower container, as shown in this image. A float must be attached to the end of the float stick. Graph all the data on one bar chart. ), What does this tell you about a water clock? This will be used to support the lower container and to record the time. Yes. Why? I joined them with a waterproof polypropylene glue, and I used my Festool domino jointer. I joined the exoskeleton with stainless pocket screws, and joined the exoskeleton to the "buckets" with stainless screws from the inside. The putty can change shape over time, making the hole larger and changing the rate of time it takes for the water to drip out.

Figure 5. The bottom of the stake should be even with the bottom of the container.

Make a pencil mark on the center line of the stake 1 inch (2.5 cm) above the top edge of the lower container. Repeat this for the second minute, third minute, and so on, until all the water originally poured into the upper half has dripped out. One will be the upper container and one will be the lower container. Stop the clock, and try to identify and fix the problem. I had some pieces of cumaru left from a deck project. Gary's plan for an exoskeleton made great sense, so I use 5/4 x 4 cumaru to do what Gary did.

With the ruler and pencil, mark the centerline on the wood stake. I wanted to thank Gary for sharing his design, rather than charging a bunch of money like everyone else does. Compared to a typical science class, please tell us how much you learned doing this project. You can purchase a wood stake at a hardware store. Watch or clock with a second hand; Pen or pencil; Ruler; Masking tape What to do: Help your child cut the top off the plastic bottle about three inches from the top.

Al-Jazari developed many cutting-edge devices; one of his most famous inventions was the elephant water clock. As seen in Figure 1, one possible set of choices is to use a wine cork as the float and a wood dowel as the stick. A flat bottom quickly creates a uniform water level, which is important for your clock to keep time accurately. Figure 1. I LOVE teaching! Water clocks measure time based on how much water flows from one container to the next. The next one will be six feet in diameter.

Gary's plan for an exoskeleton made great sense, so I use 5/4 x 4 cumaru to do what Gary did. Now push a small hole through the bottom of the cup with your pencil or pen. Record the flow rate data in a table like this one.


Michelle Maranowski, PhD, Science Buddies. What is the largest problem associated with water clocks? What is your enthusiasm for science after doing your project?

Adult supervision is required. Record all of the data in your lab notebook. Make sure that the cap does not touch the bottom of the bottle. Can you think of some ideas to keep the water level constant in the upper container? Use the kitchen timer to measure shorter periods of time and mark on the wood stake when the periods are up. Measure the distance between the first mark on the wood stake and the third mark on the wood stake (the newest one) and record the distance in your lab notebook in Table 1. Although they were only 5.5 in wide, Gary's plan worked fine. You will use a wood dowel to make the float stick. Note that you can create a larger water clock that tracks more time if you use a larger bottle, like a 2-L (2-qt) soda bottle. Using the hacksaw and a ruler, carefully cut the wood stake down to a 2 ft. length.