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BiPbSrCaCuO silver sheathed high
T
c
superconducting wires were fabricated through the solid reaction process. It is proposed in this paper that the magnetic field dependence of
J
c
of the wire is dominated by the Lorentz force perpendicular to the
c-axis, caused by a transport current with
c-axis component crossing grain boundaries, when a magnetic field is applied parallel to the plane of the wire. It was found that BiPbSrCaCuO silver sheathed wire had sufficient potential for applications at 4.2 K. The history effect of
J
c
for high
J
c
specimens was not observed at 77.3 K and appeared again at 4.2 K