[by] M.W.P. Strandberg ... [et al.]."May 10, 1955." "Reprinted from the Review of scientific instruments, vol. 27, no. 8, 596-605, August, 1956."Includes bibliographical references.Army Signal Corps Contract No. DA36-039 sc-64637, Project 102B. Dept. of the Army Project No. 3-99-10-022.