How to build a 3-pendulum rotary harmonographPosted by staff / August 17, 2010
A harmonograph is a mechanical device that uses swinging pendulums to draw pictures, believed to be originally invented in 1844 by Scottish mathematician Hugh Blackburn.
Karl Sims recently published a wonderful step-by-step how-to guide for building one of these impressive gadgets. Once built, the device will provide you with endless hours of fun and experimentation with geometric designs and colours.
Learn how to do it at Karl Sims.
More great DIY projects.