His theoretical work on the form of seismograms and their application (e.g., seismic tomography) has contributed to the study of the Earth's mantle, particularly in Australia.
Seine theoretischen Arbeiten zur Form von Seismogrammen und deren Anwendung (z. B. seismische Tomographie) trugen zur Erforschung des Erdmantels, insbesondere Australiens, bei.