A small coal washer to deal with the 1/2- to 0-in (1.3- to 0-cm) range. It works on the same basic principle as the Baum washer, but in view of the small-size material a feldspar (sp gr, 2.6) bed is provided on the perforated grid plates to prevent the bulk of the feed from passing straight through the perforations. Stratification of the raw feed takes place in the usual way.