Ley trough
A shallow trough lined with lead or zinc, in which the formes are placed in order to be cleansed from ink. A loose board should lay in it, for the protection of the bottom.
Letter trough
A shallow trough Hned with lead or zinc, in which the formes are placed in order to be cleansed from ink. A loose hoard should lay in it, for the protection of the bottom.—See Washing a Forme.
The second edition did not have an entry for Washing a Forme.