  We investigate the variations of the magnetic field, Doppler factor, and
relativistic particle density along the jet of a quasar at z=0.72. We chose 4C
19.44 for this study because of its length and straight morphology. The 18
arcsec length of the jet provides many independent resolution elements in the
Chandra X-ray image. The straightness suggests that geometry factors, although
uncertain, are almost constant along the jet. We assume the X-ray emission is
from inverse Compton scattering of the cosmic microwave background. With the
aid of assumptions about jet alignment, equipartition between magnetic-field
and relativistic-particle energy, and filling factors, we find that the jet is
in bulk relativistic motion with a Doppler factor about 6 at an angle no more
than 10 degrees to the line of sight over deprojected distances about 150--600
kpc from the quasar, and with a magnetic field approximately 10 micro Gauss.
