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XIII. On the Tides of the Arctic Seas. 
By the Bev. Samuel Haughton, M.JD. Buhl ., D.C.L. Own., F.B.S., 
Fellow of Trinity College, Dublin. 
Part VI. Tides of Port Kennedy, in Bellot Strait. 
Received January 20, — Read March 4, 1875. 
The following observations were made by Admiral Sir Leopold M‘Clintock (then 
Captain) in the month of July 1859, at Port Kennedy, in Bellot Strait, on board the 
yacht ‘ Fox,’ in eleven fathoms depth, lat. 72° OP N., long. 94° 15' W. The observa- 
tions were made hourly, and, judging from the consistent and highly interesting results 
obtained from them, they must have been made and recorded with unusual care. 
In Table I. the first column contains the Solar Hour, the second contains the 
Height of Tide, the third contains the Diurnal Tide, and the fourth the Semidiurnal 
Tide. 
The Diurnal Tide was calculated as follows : — Let h x , h 2 , h 3 be the heights of the 
water at three periods, separated by intervals of twelve hours each, then the Diurnal 
Tide corresponding to the height h 2 is 
D 
Aj— 2A 2 rf-A 3 
~ 4 
( 1 ) 
The third column was calculated from the second by this formula, and the fourth 
column, containing the Semidiurnal Tide only, is the algebraical sum of the second and 
third columns. 
