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2. A. E. Zinnes, B. E. Nevis, and C. D. Brandle, Jr., submitted for publication.
3. T. Rummel, U. S. patent 3,259,467.
4. F. W. Gilly and C. D. J. Brandle, BTL, private communications.
5. Wm. Ainsworth, Inc., 5151 S. Syracuse Street, Englewood, Colo. 80110. Digimetric Balance Model 30-DT (Factory modified for a preload of 12 Kgm).