Interestingly, though I can find only one reference to it, he found that the speed of sound in Pinus sylvestris was 25% faster along the grain, compared to across it - is this the first observation of acoustic anisotropy? So young Ernst did well to break away into a sound profession, ho ho, making substantial advances in acoustic physics.Ĭhladni, 'the father of acoustics', conducted a large number of experiments with sound, measuring the speed of sound in various solids, and - more adventurously - in several gases too, including oxygen, nitrogen, and carbon dioxode. Several of his ancestors were learned theologians, but his father was a lawyer and his mother and stepmother from lawyerly families. Ernst Chladni was born in Wittenberg, eastern Germany, on 30 November 1756, and died 3 April 1827, at the age of 70, in the Prussian city of Breslau (now Wrocław, Poland).
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