CLAY n.
r, silica, and aluminia, as halloysite, bole, etc. -- Fire clay , a variety of clay, entirely free from lime, iron, or an alkali, and therefore infusible, and used for fire brick. -- Porcelain clay, a very pure variety, formed directly from the decomposition of feldspar, and often called kaolin. -- Potter's clay, a…
COMPASSES n.
An instrument for describing circles, measuring figures, etc., consisting of two, or (rarely) more, pointed branches, or legs, usually joined at the top by a rivet on which they move.