. ~ = wee aE = > rd « ca wt ~ ee :~ Zz: = 7 a = wae x ea = = ~~ _ x . a —_ - _ + z =” s - ~~. - = . " ~ + J ane ey 2 . oe rr . . =" a. * « . - S x wat a ~ - wo = 1 . <- ” at To Ee ~ ag . = a = > . 3 ake ? ee - =. . Zi... This report was prepared as an account of Government sponsored. work. Neitherthe *, “= » A. Makes any warranty orrepresentation, expressed or implied, with respect to the § accuracy, completeness, or usefulness of the information containedin this report. or ~ - that the use of any information, apparatus, method, or process disclosed in this report : notinfringe privately owned rights; or we ro - United States, nor the Commission, nor any person acting on behalf of the Commission: “ Ttis usediin the above,“person acting on behalf of the Commission” includes any.emor contractor of the Commission, or employee of suchcontractorsto the-extent ch employét.or contractor of the Commission, or employee ofsuckcomfractor es, di inates,Or provides accesstoy ay informagio pélreusinrto hisemployera or conéPact withthe Commissionec:hi eSat -@iih gach contractor. “% + s } rr = Printed ii n the United States of America a Available from Clearinghouse fi Ped 1 Scientific and Technica! Information National Bureauof Standards, U.S. Department of Commerce Springfield, Virginia 22151 Price: Printed Copy $3.00; Microfiche $0.65 June 1970 985 copies