This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsi- Harch 30, 1953 bility 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. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recom-Th._.S document consists mendation, or favoring by the United States Government or any agency thereof. The views O_' "i'l ]:)ages _ o:_ and opinions of authors expressed herein do not necessarily state or reflect those of the 28 copies United States Government or any agency thereof.

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