![]() ![]() Ingredients: Lumber 1 3/4″ x 3'x3′ plywood for table top 4 1½" x 1½" x 40″ for legs (about 14′ total) 4 1½" x 8″ x 12″ for leg braces (about 4′ total) 4 3/4″ x 4′ dowels for pendulums and pen lifter (make sure they are straight) 1 3/4″ x 1½" x 30″ oak to cut for pendulum supports, and other 1 11″ x 11″ x 1/8″ board for platform to hold paper Hardware Store 3 3/4″ x 5″ long metal pipe nipples (plumbing section) 3 3/4″ to 1″ metal pipe bushings 3 1″ steel clamps 4 1¼" x 4″ metal plates (or 2 1¼" x 8″ plates cut in half) 1 large metal washer with 2½" outer diameter, 1″ inner diameter, for gimbal 1 screw-eye for pen lifter various drill bits: 3″ circular, 3/4″, 1/8″, etc. Harmonograph is a great project to do with kids and can result in endless experiments creating new geometric designs. It is reasonably easy to build once you've settled on a design and have acquired the appropriate materials and tools. This 3-pendulum rotary type of harmonograph gives a wide variety of satisfying results. ![]() A harmonograph is a mechanical device that uses swinging pendulums to draw pictures, believed to be initially invented in 1844 by Scottish mathematician Hugh Blackburn. This project belongs to a computer graphics artist and researcher, Karl Sims, who is best known for using particle systems and artificial life in computer animation. ![]()
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