Abstract
IN the note on the great magnetic disturbance of April 16 as recorded at Abinger Observatory, printed in NATURE of April 23, p. 721, it was only possible to give tentative estimates of the range in declination and horizontal intensity, for reasons then stated. Critical examination of the traces has since been made which confirms the estimate for declination but considerably reduces the figure given for horizontal intensity. The definitive ranges in the three elements are now stated, with the times of maximum and minimum, as below:
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