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.
COKE n.
er of its bitumen, sulphur, or other volatile matter by roasting in a kiln or oven, or by distillation, as in gas works. It is lagerly used where [Written also coak.] Gas coke, the coke formed in gas retorts, as distinguished from that made in ovens.
DEAD a.
leaves like a nettle (Lamium album). -- Dead oil (Chem.), the heavy oil obtained in the distillation of coal tar, and containing phenol, naphthalus, etc. -- Dead plate (Mach.), a solid covering over a part of a fire grate, to prevent the entrance of air through that part. -- Dead pledge, a mortgage. See Mortgage.…