Abstract
THE letter of Mr. A. S. Thompson, in your issue of December 8, adds further interesting information as to secondary undulations, to that which I sent you in a paper printed in NATURE of February 3 last. This paper appears to have escaped Mr. Thompson's attention, as in it he will find that this subject was investigated on the Swiss Lakes by Duillier in the middle of the last century, and by Vaucher in 1804. They found that these undulations are common to all lakes at intervals of about twenty minutes. More recent ly the subject was taken up by Mr. Napier Denison on the Great Lakes in Canada, where he found oscillations of three to four inches at intervals of from fourteen to eighteen minutes; and by Mr. Bell Dawson during the tidal survey of the Gulf of St. Lawrence, where he found regular minor undulations occurring, in addition to those due to the tides.
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WHEELER, W. Periodic Tides. Nature 59, 150 (1898). https://doi.org/10.1038/059150a0
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DOI: https://doi.org/10.1038/059150a0
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