Abstract
Photometry on the Washington system is presented for 125 stars in 10 of the most metal-poor Galactic globular clusters. Luminosity class, temperature, and metal abundance are derived for each star. A new temperature calibration is presented, based on recent model atmosphere calculations by Bell & Gustafsson (1989, MNRAS, 236). Metal abundances are determined utilizing a recently improved calibration which corrects for the decreased metallicity sensitivity of cooler giants and introduces a new temperature index, which significantly reduces the effects of photometric errors and reddening uncertainties in determining abundances for very metal-poor stars
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