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The Illustrated London News, vol. 47, no. 1338, p. 370.

October 14, 1865


...Lieutenant-Colonel J. D. Graham, of the U.S. Engineers, has reported to the American Academy of Arts and Sciences the results of a series of observations proving the existence in Lake Huron, not only of a semi-diurnal lunar tide, but also of a semi-diurnal solar tide, which is separable from that produced by the combined action of the sun and moon, as he previously had shown for Lake Michigan. Colonel Graham added that no observations, as far as he knew, had ever been made to ascertain the existence of this phenomenon in the Caspian Sea, which is a perfect lake, and the largest and deepest known. He, therefore, suggested that the attention of the scientific world should be drawn to the importance of a series of tidal observations there....

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