John Joly (1857–1933) was an Irish physicist and a pioneer in the field of geology and radiology. He is best known for his work in developing methods for measuring radioactivity and for his contributions to scientific understanding of geological time. One of Joly's notable contributions was the development of the Joly water clock, which used the expansion and contraction of water to measure time, and he also proposed techniques for determining the ages of geological materials based on radioactive decay.
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