Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. .NOTICE This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Energy Research & Development Administration, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately-owned rights. NOTICE Reference to a company or product name does not imply approval or recommendation of the product by the University of California or the US. Energy Research & Development Administration to the exclusion of others that may be suitable.