How to Build a Flood Detector Simulator
Materials: 1. A big bucket 2. A 20 cm long water pipe with a diameter of approx. 3 cm 3. A table tennis ball 4. A hammer and nails 5. A house bell (button and speaker separated) whose diameter is equal or slightly less wide than the diameter of the water pipe Steps: 1. Take off the spring from the house bell¶s button so the button won¶t come back out when you press it. 2. Knock a nail into the bottom of the pipe horizontally so you can put in the table tennis ball to it without having it fall down. 3. In this simulator, assume that the inner surface of
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