Harmonograph

A collapsible and compactable harmonograph adapted to generate compound harmonic oscillations and thereby record different, complex, consistent, geometrical patterns of diminishing scope, comprising

• (a) a drawing surface
• (b) means for freely suspending said drawing surface, said suspension means comprising gimbal means mounted above the drawing surface, a member secured to said gimbal means for conjoint movement therewith and a plurality of vertical and diagonal flexible collapsible suspension cords arranged in a selected manner connecting said member to the drawing surface to permit said drawing surface to undergo pendulum-like oscillations in an infinite number of vertical planes, but to be substantially restrained from performing rotational or torsional oscillations about its central vertical axis by virtue of said diagonal cords;
• (c) a bob suspended by a flexible, collapsible suspension cord attached to the bottom side of said drawing surface, and
• (d) a stylus mountable independently of said drawing surface to contact said drawing surface at an adjustable contact pressure and to be held in positive contact therewith during the compound harmonic oscillation effected by the interaction of said two linked gravity pendulums.