1. Polytechnical Institute of Baku, USSR; Division of Machines and Structures, Rensselaer Polytechnic Institute, Troy, N. Y.
2. Materials and Processes Laboratory, General Electric Co., Schenectady, N. Y.; Rensselaer Polytechnic Institute, Troy, N. Y.
3. Division of Machines and Structures, Rensselaer Polytechnic Institute, Troy, N. Y.