Wednesday, March 8 – 2:30 to 4:30 pm (ish)

Today makers young and old are invited to help Dave test out the rotary harmonograph. This contraption will be featured on Saturday, March 25 – NJ Makers Day. Many thanks to Karl Sims for his plan and instructions which can be found online here (

Get 1, 2, or all 3 pendulums swinging and drop the pen. Vary the frequency. See what happens.