  We are developing instrumentation for a telescope design capable of measuring
linear X-ray polarization over a broad-band using conventional spectroscopic
optics. Multilayer-coated mirrors are key to this approach, being used as Bragg
reflectors at the Brewster angle. By laterally grading the multilayer mirrors
and matching to the dispersion of a spectrometer, one may take advantage of
high multilayer reflectivities and achieve modulation factors over 50% over the
entire 0.2-0.8 keV band. We present progress on laboratory work to demonstrate
the capabilities of an existing laterally graded multilayer coated mirror pair.
We also present plans for a suborbital rocket experiment designed to detect a
polarization level of 12-17% for an active galactic nucleus in the 0.1-1.0 keV
band.
