Richard Dixon Oldham

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Science and technology

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What Wikipedia says

Richard Dixon Oldham FRS (; 31 July 1858 – 15 July 1936) was a British geologist who made the first clear identification of the separate arrivals of P-waves, S-waves and surface waves on seismograms and the first clear evidence that the Earth has a central core.

Excerpt from the Wikipedia article “Richard Dixon Oldham”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Original on Roger Bilham's earthquake-site, Public domain, via Wikimedia Commons.