Abstract
Radial velocities for galaxies in the cluster Abell 2670 have been measured on an objective prism plate and compared with previously published velocities from slit spectra. These indicate that the prism velocities are accurate to ∼ 1800 km s−1. Similar velocities have been measured for the cluster of galaxies Abell 140, the results indicating a wider dispersion in velocities than would be expected for a single cluster. We conclude that the technique is useful for determining the radial velocities of clusters, for testing the cluster membership of bright elliptical galaxies, and for resolving superimposed clusters.
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