E. Maxwell, P.M. Marcus, J.C. Slater."This paper is based on a thesis submitted in partial fulfillment of the Degree of Doctor of Philosophy at M.I.T." "May 2, 1949."Bibliography: p. 55.Army Signal Corps Contract No. W36-039-sc-32037 Project No. 102B Dept. of the Army Project No. 3-99-10-022