This repprt was prepared as an account of work sponsore d by the United States Governm ent. Neither the Unit'ed States nor the United States Atomic Energy Commis sion, nor any of their employe es, nor any of their contracto rs, subcontra ctors, or their employee s, makei any warranty, express or implied, or assumes any I legal liability or responsi bility for the accurac y, completeness ss or usefulnes s of any informati on, apparatu s, produr.t or process disclosed, or represen ts that its use would not infringe privately owned rights.