Richard Dixon Oldham
Richard Dixon Oldham was born on July 31, 1858. See ranking, bio blurb, and everyone else born that day.
About Richard Dixon Oldham
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.