![]() ![]() The exhibit will be on display through July. This exhibit features many different types of drawings ( harmongrams) using a variety of inks, colors and paper. When not being used as a drawing machine the device can be disassembled and used as a coffee table. ![]() Don Fitzpatrick built the harmonograph used in this exhibit based on several different designs in order to make a machine that could be portable and multi-functional. By varying the frequency and phase of the pendulums relative to one another different patterns are created. Two linked pendulums move a pen in a circular motion along one axis and the third pendulum moves the drawing surface in a rotary motion along a perpendicular axis. ![]() The harmonograph used to create the images in this exhibit employs three pendulums to control the movement of a pen relative to a drawing surface. The harmonograph was invented in 1844 by Hugh Blackburn, a professor of mathematics at the University of Glasgow. The drawings it creates are called Lissajous curves. A harmonograph is a mechanical apparatus that employs pendulums to create a geometric image.
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