The observed phenomenon of a superimposed axial stress pulse traveling at an elastic stress wave velocity down a rod which was axially stressed in the plastic region initially, has been explained by taking into account three-dimensional stress effects [l], 3 and Lee [2]. Rate-dependent theory also explains the phenomenon, as in a recent publication by Nicholas [3]. There is a need for analytical studies of three-dimensional stress effects for stress pulses in initially plastically stressed rods and tubes. The assumption by Banerjee and Malvern of a two-dimensional stress state in the tubes which were tested may not be accurate.

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Liquid-vapor phase compositions are given for 11 isotherms of the system normal-hydrogen-helium over the range 15.5° to 29.8°K at pressures to 1500 Ib/in.2 In this range, the mixture critical curve is located, the freezing points are shown, and the locus is determined for the barotropic phenomenon (gravitational phase inversion). Two isotherms are duplicated with the substitution of parahydrogen.

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