  The Stacey-Sigmar model for tokamak equilibrium as presented in the
literature relies heavily on the neoclassical theory of the electrostatic
field. Its neglect of Gauss's law is inconsistent with the potential
formulation of electrodynamics. Its treatment of the dynamic electric field
generated by the central heating and poloidal field coils also is suspect. Its
derivation of the viscosity term remains incomplete and does not account for
the varying pitch angle of the magnetic field. A derivation of the viscosity
term which respects the pitch angle can account for the radial force commonly
ascribed to the radial electrostatic field, thereby obviating the desire to
neglect Gauss's law.
