This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Atomic Energy Commission, nor any of their employees, nor any of their contractors, subcontractors, or their employees, \ legal liability or responsibility for the accuracy, com-makes any warranty, express or implied, or assumes any pleteness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights.