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This is a functional model of the pendulum clock said to have been designed by Galileo. This is designed to be used as a historical teaching model for hands-on student interaction. Students learn about gears and gearing, stored energy (through the rubber band), the escapement mechanism, and the properties of the pendulum. The pendulum in this clock is designed to enable students to explore how weight and length impact period by making it easy for students to move washers or large nuts along notches on the pendulum (full length and half-way up).
This is designed to be cut from 1/4" (5mm) plywood. It is designed to work with 1/4" dowels but be warned the holes for the gears are very snug (on purpose). The frame is designed to use nylon washers to reduce friction with a 1/4" ID and a 3/8" OD. Look at the pictures to help with the assembly. Look at the washer spacing for the pendulum and escapement mechanism. Also note that the escapement requires a piece to be glued to it above to enable it to work. It is the small rectangle in the plans. You may need to play a little with the exact placement of the two catches on the pendulum. This model is designed to fit very snugly around the 1/4" dowel. You should adjust it manually until it works correctly. Then, use a spot of super glue to hold it in place.