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Bertrand Russell

1972; Nature Portfolio; Volume: 236; Issue: 5347 Linguagem: Inglês

10.1038/236413e0

1476-4687

RONALD W. CLARK,

Philosophical Ethics and Theory

SIR,-ln the article "A Soft-centred Earth" (Nature, Z35, 304 ; 1972), your correspondent appears to be implying that the detection of seismic pulses reflected from the inner core boundary announced by Engdahl et al. at the 1970 meeting of the Seismological Society of America was a novelty.In the interest of accuracy, and without diminishing in any way the accomplishment of Engdahl et al., let me point out that more than 10 years ago Caloi (Geophys.