Abstract
The behavior of the critical transport current in two niobium wires was observed. The critical current and the magnetization were measured in longitudinal and transverse magnetic fields and the results of reversing the field and current direction with suitable treatment of the wires indicate the dependence of the critical current of a nonideal type II superconductor on the polarity of the current. It is also shown that the upper critical field can be obtained from the critical current curve in a longitudinal field, and the critical current behavior in a transverse field agrees with the modified Silsbee rule. (L.B.S.)
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