A glass vase or large plastic food storage bin would work well. Here we have suggested a few, but feel free to add others: The clock must keep track of three hours of time. but you should feel free to use As they read, ask students to write down the answers to these questions: How A Water Clock Works In the first part of the activity, the class will investigate how a water clock works and the effect of one of its variables on its ability to be an accurate timepiece. I made pillow blocks from wood which seem to work just fine. If using a plastic cup instead of the top portion of the bottle, rest the cup inside the lower half of the bottle with the bottom of the cup facing down. Graph all the data on one bar chart. My wheel is 12" wide, and I laminated pieces to form the "buckets." Although they were only 5.5 in wide, Gary's plan worked fine. I joined the exoskeleton with stainless pocket screws, and joined the exoskeleton to the "buckets" with stainless screws from the inside. Here is the water wheel I built earlier this summer. For example, a drop is one second. It is for decoration only, and not actual work, but it looks great. You can still use them to measure time today! This line should be a vertical one. Using eyelet screws to secure the stick part of the float stick to the wooden stake will decrease the amount of bobbing around that the float stick does. After your set amount of time passes, use your marker to draw another line on your wood stick to match the line drawn on your float stick. The dowel you use will need to fit into the eyelet screws comfortably and without much friction or tension. Do not start it yet. This waterwheel comes to us from Gary Mastolier in Bonners Ferry, Idaho. Measure the distance between the first mark on the wood stake and the second mark and record it in your lab notebook in a table like Table 2. Your alarm water clock should provide some kind of noise so that if you are not in the same room as the water clock you can hear when time is up. Does your data vary a lot over the three trials? Provide students some time in class and outside of class to develop the concepts for their robots, check their ideas to be sure they meet the design criteria and are safe, and then provide at least one or two periods of in-class time for part of the construction, so you can judge how the group members are working together and to provide encouragement and reinforcement of their ideas. (It might not be very accurate. All tip submissions are carefully reviewed before being published. Use the thinnest nail possible. Try one of our science activities for quick, anytime science explorations. No, though the bigger it is, the easier it will be to read. Wood stake, 3/4 x 3/4 x 36 inches. Label this line with the correct amount of time. That's two pieces of 3/4" Doug fir glued together cross grain to each other. How does a siphon contribute to the function of a toilet? If you continue to use this site we will assume that you are happy with it. Building a Better Water Clock In this part of the activity, students will build a feedback-controlled robotic system that will function as a water clock that will keep time accurately for at least two hours without human intervention. The Engineering Design Process to improve your own design and create a clock that appeals to you. Holding a finger over the hole, fill the bottle with water to a level just below the shoulder where it begins to have a smaller diameter. Figure 5. Actual testing of the finished robots could be an event open to the whole school as each is tested at two or three random times during a two-hour run to see whether it is keeping time to within the specified +/- 1% over the entire period. The robots can also range from ones powered only by the force of gravity to ones that incorporate electrical components like small motors. lessonsErupting Volcanoes! Repeat this at the second mark. This article has been viewed 86,569 times. 12) so that the dowel can fit comfortably within the eyelet and you can easily screw them into the wood stake. What is the largest problem associated with water clocks? The perfect thing to liven up a rainy day, school vacation, or moment of boredom. Receive book suggestions, reading tips, educational activities, and great deals. Procedure: Divide the class into groups. The clepsydra, or water clock, dates back to 1500 BC and was once a valuable time-tracking tool used in various ancient societies. I had some pieces of cumaru left from a deck project. As the water flows from the upper container to the lower container, the … Make sure that the cap does not touch the bottom of the bottle. Time marks most of the activities in our busy, everyday lives. Al-Jazari developed many cutting-edge devices; one of his most famous inventions was the elephant water clock. I used Gary's plan to make my own water wheel. Repeat the experiment with the starting water level about halfway up the bottle and with the starting water level very low in the bottle. The source of water could range from a large (2-L) reservoir of water to the tap, again depending on the restrictions you wish to place on the design. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. Alternatively, if you do not have a tool that can create a hole in the hard plastic lid, you can use a plastic cup instead of the top part of the bottle. Stick a length of masking tape on the outside of the bottle, from the top to the bottom in a straight line. Thanks a million Gary for sharing this wonderful waterwheel. Containers (2).