Chladni Figures (1787)

These wonderful diagrams are to be found in Entdeckungen über die Theorie des Klanges (Discoveries in the Theory of Sound), a late 18th-century work by German physicist and musician Ernst Chladni (1756-1827), in which he details his experiments - for which he is sometimes labelled the "father of acoustics" - with vibrating plates and nodal patterns.

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Source: Chladni Figures (1787)