These machines might employ strange combinations of sinusoidal and non-sinusoidal oscillators, or weird damping profiles, or unusual paper table paths, or require external power through motors or hand cranks in order to overcome damping (friction). And further, the design space might also includ e other more complicated harmonograph machines that have not yet been built, including machines that are too elaborate for construction. The design space should also include pintograph machines, or machines based on multiple rotating disks that are connected together through linkages. The design space must of course include classical harmonograph machines, based on 2-3 pendulums, that are driven only by gravity and subject to friction or damping. The design space is nearly infinite for harmonographs, when the definition is somewhat broadened.
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