Harmonographs. I. Pendulum design
Mechanical devices that undergo various kinds of repetitive motion and which draw the curves produced from this motion are known as "harmonographs." One such class of these devices are those that operate by means of pendulum action. These devices range from modifications of a simple pendulum to various physical and compound pendulums. This paper traces the history of the development of this class of apparatus.
Physics, Astronomy, and Materials Science
Whitaker, Robert J. "Harmonographs. I. pendulum design." American Journal of Physics 69, no. 2 (2001): 162-173.
American Journal of Physics