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In Mathematics , a Lissajous curve ('''Lissajous figure''' or '''Bowditch curve''') is the graph of the system of Parametric Equation s : which describes Complex Harmonic Motion . This family of Curve s was investigated by Nathaniel Bowditch in 1815 , and later in more detail by Jules Antoine Lissajous . The appearance of the figure is highly sensitive to the ratio ''a''/''b''. For a ratio of 1, the figure is an Ellipse , with special cases including Circles (''A'' = ''B'', δ = π /2 Radian s) and Lines (δ = 0). Another simple Lissajous figure is the Parabola (''a''/''b'' = 2, δ = π/2). Other ratios produce more complicated curves, which are closed only if ''a''/''b'' is Rational . The visual form of these curves is often suggestive of a three-dimensional Knot , and indeed the many kinds of knots, including those known as Lissajous Knot s, project to the plane as Lissajous figures. Lissajous figures are sometimes used in Graphic Design as Logo s. Examples include the logos of the Australian Broadcasting Corporation (''a'' = 1, ''b'' = 3, δ = π/2) and the Lincoln Laboratory at MIT (''a'' = 8, ''b'' = 6, δ = 0). Lissajous curves can be traced mechanically by means of a Harmonograph . | ||
| Image:LissajousCurve1by2PNG''a'' | 1, ''b'' = 2 |
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| Image:LissajousCurve3by2PNG''a'' | 3, ''b'' = 2 |
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| Image:LissajousCurve3by4PNG''a'' | 3, ''b'' = 4 |
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| Image:LissajousCurve5by4PNG''a'' | 5, ''b'' = 4 |
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| Image:LissajousCurve5by6PNG''a'' | 5, ''b'' = 6 |
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| Image:LissajousCurve9by8PNG''a'' | 9, ''b'' = 8 |
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