  Large samples of Field Horizontal Branch (FHB) stars make excellent tracers
of the Galactic halo; by studying their kinematics, one can infer important
physical properties of our Galaxy. Here we present the results of a
medium-resolution spectroscopic survey of 530 FHB stars selected from the
Hamburg/ESO survey. The stars have a mean distance of ~7 kpc and thus probe the
inner parts of the Milky Way halo. We measure radial velocities from the
spectra in order to test the model of Sommer-Larsen et al., who suggested that
the velocity ellipsoid of the halo changes from radially-dominated orbits to
tangentially-dominated orbits as one proceeds from the inner to the outer halo.
We find that the present data are unable to discriminate between this model and
a more simple isothermal ellipsoid; we suggest that additional observations
towards the Galactic centre might help to differentiate them.
