  Starting from Buchm\"uller's observation that a chromoelectric flux tube
meson will exhibit only the Thomas type spin-orbit interaction, we show that a
model built upon the related assumption that a quark feels only a constant
radial chromoelectric field in its rest frame implies a complete relativistic
effective Hamiltonian that can be written explicitly in terms of quark
canonical variables. The model yields linear Regge trajectories and exhibits
some similarities to scalar confinement, but with the advantage of being more
closely linked to QCD.
