Harmonograph
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A harmonograph is a mechanical apparatus that employs pendulums to create a geometric image. The drawings created typically are Lissajous curves or related drawings of greater complexity. The devices,
Harmonograph
A Lissajous figure, made by releasing sand from a container at the end of a Blackburn pendulum
A harmonograph at Questacon in Canberra, Australia
A figure produced by a simple lateral harmonograph
Lissajous curve
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A Lissajous curve, also known as Lissajous figure or Bowditch curve, is the graph of a system of parametric equations
Harmonograph
…A harmonograph is a mechanical apparatus that employs pendulums to create a geometric image. The drawings created typically are Lissajous curves or related drawings of greater complexity. The devices, which began to appear in the mid-19th century and peaked in popularity in the 1890s, cannot be…
Lissajous figure on an oscilloscope, displaying a 1:3 relationship between the frequencies of the vertical and horizontal sinusoidal inputs, respectively. This particular Lissajous figure was adapted into the logo for the Australian Broadcasting Corporation