Harmonographs - exclusively yours!

The popular Harmonograph Table is a giant compound pendulum suspended by four cables. Visitors gently swing the 110-pound table and a colored marker records the complex path.  The tracing creates a one-of-a-kind poster for the visitor to take home and display.  At this exhibit and others, visitors discover for themselves important concepts:  What happens when the direction of a push is changed? How do the paths traced by one- and two-point sand pendulums differ? Does the length of a pendulum change the time it takes for each swing?