High-Precision 14 C Measurement of Irish Oaks to Show the Natural 14 C Variations from AD 1840–5000 BC: A Correction

We present here 14 C data representing previously published material (Pearson et al. 1986) with minor corrections. All corrections used for calculations published in Pearson et al. (1986) have been re-evaluated, and only one was found to be significantly different. This correction, namely, ‘the variation of efficiency with time', being additional to all other corrections for changes in efficiency, was more subjective; the others could be checked and accounted for by experimentation.