This dissertation was prepared under the direction of the chairman of the candidate's supervisory committee and has been approved by all members of that committee. It was submitted to the Dean of the College of Engineering and to the Graduate Council, and was approved as partial fulfillment of the requirements for the degree of Doctor of Philosophy.



March, 1968




                                eeen of Engnerig




                          Dean, Graduate School



Superviso  Co  ittee:






    S  / '             t


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