  The azimuthal distribution of pairs of particles in a jet is sensitive to the
transverse polarization of the quark initiating the jet, but with a sensitivity
that involves a nonperturbative analyzing power. We show in detail how to
measure the analyzing power from 4-hadron correlations in $e^+ e^- \to 2 \ {\rm
jets}$. We explain the combinations of particle flavor that are likely to give
the biggest effect.
