1. Research Assoc. Prof., Fritz Engrg. Lab., Civ. Engrg. Dept., Lehigh Univ., Bethlehem, Pa.
2. Engr., State Electricity Comm., Melbourne, Victoria, Australia; formerly, Research Instructor, Fritz Engrg. Lab., Civ. Engrg. Dept., Lehigh Univ. Bethlehem, Pa.