COAL TAR n.
A thick, black, tarry liquid, obtained by the distillation of bituminous coal in the manufacture of illuminating gas; used for making printer's ink, black varnish, etc. It is a complex mixture from which many substances have been obtained, especially hydrocarbons of the benzene or aromatic series.
HARD a.
r Hard-shelled clam (Zoöl.), the guahog. -- Hard coal, anthracite, as distinguished from bituminous or soft coal. -- Hard and fast. (Naut.) See under Fast. -- Hard finish (Arch.), a smooth finishing coat of hard fine plaster applied to the surface of rough plastering. -- Hard lines, hardship; difficult conditions.…
KEROSENE n.
l used for illuminating purposes, formerly obtained from the distillation of mineral wax, bituminous shale, etc., and hence called also coal oil. It is now produced in immense quantities, chiefly by the distillation and purification of petroleum. It consists chiefly of several hydrocarbons of the methane series.…