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We present spectroscopic data for individual stars observed from 2004 Marchthrough 2008 August as part of our Michigan/MIKE Fiber System (MMFS) survey offour dwarf spheroidal (dSph) galaxies: Carina, Fornax, Sculptor and Sextans.Using MMFS at the Magellan/Clay Telescope at Las Campanas Observatory, we haveacquired 8855 spectra from 7103 red giant candidates in these Galacticsatellites. We list measurements of each star's line-of-sight velocity (medianerror +/- 2.1 km/s) and spectral line indices for iron and magnesium absorptionfeatures. We use globular cluster spectra to calibrate the indices ontostandard [Fe/H] metallicity scales, but comparison of the resultingmetallicities with published values suggests that the MMFS indices are bestused as indicators of relative, not absolute metallicity. The empiricaldistributions of velocity and spectral indices also allow us to quantify theamount of contamination by foreground stars. In a companion paper we develop analgorithm that evaluates the membership probability for each star, showing thatthe present MMFS sample contains more than 5000 dSph members, including 774Carina members, 2483 Fornax members, 1365 Sculptor members, and 441 Sextansmembers.

Stellar Velocities in the Carina, Fornax, Sculptor and Sextans dSph Galaxies: Data from the Magellan/MMFS Survey