March 13, 1909
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A Typographical Error Corrected To the Editor of the SCIENTIFIC AMERICAN: I notice that you published my communication of January 14th. I feel much indebted for your kindness, but 1 beg to be allowed to call attention to an error, undoubtedly typographical, in which 11 (eleven) appears instead of 44 (forty-four). My authority for this value of 44 (forty-four) hours for the mean interval which elapses between a solar outburst and the terrestrial response is Svante Arrhe-nius, while he again ascribes it to Ricco. An exposition of this matter by Prof. Arrhenius may be found in the SCIENTIFIC AMERICAN SUPPLEMENT for January 11th, 1908, No. 1671. WILFRID S. GRIFFIN. Pittsfield, Mass., February 16th, 1909.
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