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, expressed 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 this report may notinfringe privately owned rights; or B. Assumes anyliabilities 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, “person acting on behalf of the Commission” includes any em- ployee or contractor of the Commission, or employee of such contractor, to the extent that such employee or contractor of the Commission, or employee of such contractor prepares, disseminates, or provides access to, any information pursuant to his employ- ment or contract with the Commission, or his employment with such contractor. Printed in the United States of America Available from Clearinghouse for Federal Scientific and Technical Information National Bureau of Standards, U.S. Department of Commerce Springfield, Virginia 22151 Price: Printed Copy $3.00; Microfiche $0.65 April 1967 1150 copies