Abstracl. We describe all inslrunleJll we have buill and installed at Mces Solar Observatory OilHaleakala, Maul, to measure polarizalion in narrow-band solar images. Observalions in Zeemansensitive photospheric lines have been made for nearly all solar active regions since the inst,'ument began operations in 1992. The magnetograph includes a 28-cm aperture telescope, a pelarization inodulator, a lunable Fabry-Pdrot lilter, CCD cameras and contn)l electronics. Stokes spectra of a photospheric line are obtained with 7 pm speclral resolution, 1 arc sec spatial resolution o',:er a lield 4.7 arc nlin square, and polarimetric precision of 0. 1%. A complete vector magnetogram observation can be made every eighl ininutes. The flexi ) ty of the instrulnent encourages diverse observations: besides active region nlaglletogranls we have made, for example, composite vector magnetograms of the full solar disk, and Ha polarization movies of flaring regions.
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