Lick image-dissector scanner spectra obtained from 1972 to 1984 have been used to derive central velocity dispersions for over 350 elliptical galaxies, as published in an earlier paper. This paper details the cross-correlation method used and tabulates central velocity dispersions for 79 additional early-type galaxies not included in that earlier work. The special problems of using the cross-correlation method as applied to IDS data are addressed, and various tests of the effects of random and systematic errors are made to establish the accuracy of the results. A significant difference is described between the present cross-correlation technique and the method as originally developed by Tonry and Davis.
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Ore et al. (1991) studied this question.