LEGAL NOTICE This report was prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any person acting on behalf of the Commission: A. Makes any warranty or representation, expreased or implied, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process disclosed in thia report may not infringe privately owned righta; or B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, ‘‘pergon acting on behalf of the Commission’’ includes any em- ployee or contractor of the Commission, or employee of such contractor, to the extent that auch employee or contractor of the Commission, or employee of such contractor prepares, disseminates, or provides access to, any information pursuant to his employmentor contract with the Commission, or his employment with such contractor. This report has been reproduced directly from the best available copy. Printed in USA. Price $2.50. Available from the Office of Technical Services, Department of Commerce, Washington 25, D. C. AEC Technical Information Service Extension Oak Ridge, Tennessee