It may mean a single roofing slate, or a writing slate, traditionally a small piece of slate, often framed in wood, used with chalk as a notepad or noticeboard etc., and especially for recording charges in pubs and inns.
It may mean a single roofing slate for recording charges in pubs and inns. It may mean a writing slate often framed in wood, used with chalk as a notepad or noticeboard etc., and especially for recording charges in pubs and inns. A writing slate is traditionally a small piece of slate.