  We present a study of perpendicular subcritical shocks in a collisional
laboratory plasma. Shocks are produced by placing obstacles into the
super-magnetosonic outflow from an inverse wire array z-pinch. We demonstrate
the existence of subcritical shocks in this regime and find that secondary
shocks form in the downstream. Detailed measurements of the subcritical shock
structure confirm the absence of a hydrodynamic jump. We calculate the
classical (Spitzer) resistive diffusion length and show that it is
approximately equal to the shock width. We measure little heating across the
shock (< 10 % of the ion kinetic energy) which is consistent with an absence of
viscous dissipation.
