John Tyndall (August 2, 1820 - December 4, 1893) was an Irish physicist and medical educator. Beginning in the late 1850s, Tyndall studied the action of radiant energy on the constituents of air. In 1893 he died from an accidental overdose of chloral hydrate. He was 73 years old. No photographer credited, undated.

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John Tyndall, Irish Physicist

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