The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
the bottom of a blast furnace, cupola furnace, water-jacketed blast furnace, and several other types of shaft metal furnaces. The hearth bottom is faced with refractory brick or carbon blocks or is rammed with a refractory material.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.