This is the second in a series of papers presenting a new calculation of the mass of the Galaxy based on radial velocities and distances for a sample of faint 16 < B < 21.3 field blue horizontal-branch ( BHB ) stars .
We present accurate BV CCD photometry and spectra for 142 candidate A–type stars selected from ub _ { j } r photometry of UK Schmidt telescope plates in six high–Galactic–latitude fields .
Classification of these candidates produces a sample of 60 BHB stars at distances of 11–52 kpc from the Sun ( mean 28 kpc ) , with heliocentric line-of-sight velocities accurate to 15 km s ^ { -1 } , and distance errors < 10 \% .
We provide a summary table listing coordinates and velocities of these stars .
The measured dispersion of the radial component of the Galactocentric velocity for this sample is 108 \pm 10 km s ^ { -1 } , in agreement with a recent study of the distant halo by Sirko and coworkers .
Measurements of the Ca II K line indicate that nearly all the stars are metal-poor with a mean [ Fe/H ] = -1.8 with dispersion 0.5 .
Subsequent papers will describe a second survey of BHBs to heliocentric distances 70 < R < 125 kpc and present a new estimate of the mass of the Galaxy .