LIST OF SYMBOLS

Support for this work came from ONR under contract no. N000 14-86-K-0508. The authors acknowledge helpful discussions with Dr. H. A. Schafft from the National Bu-reau of Standards during the preparation of this manu-script. The Temptronics Corporation and Alessi Incorpo-rated are acknowledged for their generous donation f the equipment used in this study. Manuscript submitted Oct. 23, 1986; revised manu-script received about May 1, 1987. Syracuse University assisted in meeting the publica-tion costs of this article. A A