Acknowledgements, Generous help by the staff of the Department of Oceanography, 
Agricultural and Mechanical College of Texas, College Station, Texas, hae 
been given to the author which enabled him to carry out the numerical compu- 
tations. The author is especially grateful to Dr. Dale F. Leipper, Head of 
the Department, and to Mrs, Robert Shrode of this department. 
~i2e 
